./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/ss1.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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/ss1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/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 26cc6c43657aae3d6045b0e296032a25844d2e64f01344915dc1323c4b8b39f3 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:09:10,949 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:09:11,028 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:09:11,033 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:09:11,034 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:09:11,066 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:09:11,067 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:09:11,068 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:09:11,069 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:09:11,070 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:09:11,071 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:09:11,072 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:09:11,072 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:09:11,073 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:09:11,073 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:09:11,073 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:09:11,074 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:09:11,074 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:09:11,075 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:09:11,075 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:09:11,076 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:09:11,077 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:09:11,078 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:09:11,078 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:09:11,078 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:09:11,079 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:09:11,089 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:09:11,090 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:09:11,090 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:09:11,091 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:09:11,092 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:09:11,092 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:09:11,092 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:09:11,093 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:09:11,093 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:09:11,093 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:09:11,094 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:09:11,094 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:09:11,094 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:09:11,094 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:09:11,095 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:09:11,095 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:09:11,096 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:09:11,096 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:09:11,097 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:09:11,097 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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 26cc6c43657aae3d6045b0e296032a25844d2e64f01344915dc1323c4b8b39f3 [2023-11-19 05:09:11,418 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:09:11,461 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:09:11,464 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:09:11,465 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:09:11,467 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:09:11,469 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-fpi/ss1.c [2023-11-19 05:09:14,477 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:09:14,802 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:09:14,802 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/sv-benchmarks/c/array-fpi/ss1.c [2023-11-19 05:09:14,810 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/data/24245c71e/acc7231aabc142dd925c49ecadb1a0e6/FLAG3873eb965 [2023-11-19 05:09:14,829 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/data/24245c71e/acc7231aabc142dd925c49ecadb1a0e6 [2023-11-19 05:09:14,835 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:09:14,839 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:09:14,843 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:09:14,844 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:09:14,850 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:09:14,853 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:09:14" (1/1) ... [2023-11-19 05:09:14,855 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23b3492 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:14, skipping insertion in model container [2023-11-19 05:09:14,855 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:09:14" (1/1) ... [2023-11-19 05:09:14,880 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:09:15,071 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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/sv-benchmarks/c/array-fpi/ss1.c[586,599] [2023-11-19 05:09:15,095 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:09:15,105 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:09:15,118 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_98ec4658-6cd5-4527-a33c-47ac5354ee6e/sv-benchmarks/c/array-fpi/ss1.c[586,599] [2023-11-19 05:09:15,128 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:09:15,142 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:09:15,143 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15 WrapperNode [2023-11-19 05:09:15,143 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:09:15,144 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:09:15,144 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:09:15,144 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:09:15,151 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,158 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,179 INFO L138 Inliner]: procedures = 17, calls = 31, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 95 [2023-11-19 05:09:15,180 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:09:15,180 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:09:15,181 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:09:15,181 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:09:15,192 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,192 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,195 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,195 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,202 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,211 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,213 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,214 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,216 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:09:15,228 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:09:15,228 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:09:15,228 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:09:15,229 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (1/1) ... [2023-11-19 05:09:15,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:09:15,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:15,265 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:09:15,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:09:15,310 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:09:15,310 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:09:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:09:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:09:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:09:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:09:15,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:09:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:09:15,312 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:09:15,410 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:09:15,412 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:09:15,609 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:09:15,675 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:09:15,675 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 05:09:15,679 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:09:15 BoogieIcfgContainer [2023-11-19 05:09:15,679 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:09:15,682 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:09:15,682 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:09:15,686 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:09:15,686 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:09:14" (1/3) ... [2023-11-19 05:09:15,687 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d35b91a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:09:15, skipping insertion in model container [2023-11-19 05:09:15,687 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:09:15" (2/3) ... [2023-11-19 05:09:15,687 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d35b91a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:09:15, skipping insertion in model container [2023-11-19 05:09:15,687 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:09:15" (3/3) ... [2023-11-19 05:09:15,688 INFO L112 eAbstractionObserver]: Analyzing ICFG ss1.c [2023-11-19 05:09:15,720 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:09:15,721 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:09:15,764 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:09:15,771 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;@1cf6f331, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:09:15,771 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:09:15,774 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:15,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:09:15,780 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:15,780 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:15,781 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:15,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:15,785 INFO L85 PathProgramCache]: Analyzing trace with hash 581057961, now seen corresponding path program 1 times [2023-11-19 05:09:15,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:15,793 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502201784] [2023-11-19 05:09:15,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:15,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:15,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:15,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:15,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502201784] [2023-11-19 05:09:15,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:09:15,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651182617] [2023-11-19 05:09:15,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:15,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:15,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:15,994 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:15,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:09:16,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:16,079 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:09:16,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:16,153 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 05:09:16,153 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:09:16,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651182617] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:09:16,154 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:09:16,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:09:16,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395512576] [2023-11-19 05:09:16,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:09:16,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:09:16,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:16,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:09:16,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:09:16,196 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:16,272 INFO L93 Difference]: Finished difference Result 22 states and 31 transitions. [2023-11-19 05:09:16,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:09:16,275 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 05:09:16,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:16,284 INFO L225 Difference]: With dead ends: 22 [2023-11-19 05:09:16,284 INFO L226 Difference]: Without dead ends: 10 [2023-11-19 05:09:16,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:09:16,294 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:16,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:09:16,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-19 05:09:16,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-19 05:09:16,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2023-11-19 05:09:16,339 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 8 [2023-11-19 05:09:16,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:16,340 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2023-11-19 05:09:16,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,340 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2023-11-19 05:09:16,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:09:16,341 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:16,341 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:16,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:16,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:09:16,548 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:16,549 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:16,549 INFO L85 PathProgramCache]: Analyzing trace with hash 431603023, now seen corresponding path program 1 times [2023-11-19 05:09:16,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:16,550 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343900323] [2023-11-19 05:09:16,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:16,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:16,604 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:09:16,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1301507401] [2023-11-19 05:09:16,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:16,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:16,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:16,607 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:16,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:09:16,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:16,684 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:09:16,686 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:16,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:09:16,731 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:09:16,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:16,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343900323] [2023-11-19 05:09:16,736 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:09:16,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301507401] [2023-11-19 05:09:16,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301507401] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:09:16,737 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:09:16,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:09:16,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98821841] [2023-11-19 05:09:16,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:09:16,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:09:16,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:16,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:09:16,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:09:16,764 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:16,813 INFO L93 Difference]: Finished difference Result 18 states and 25 transitions. [2023-11-19 05:09:16,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:09:16,829 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:09:16,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:16,830 INFO L225 Difference]: With dead ends: 18 [2023-11-19 05:09:16,831 INFO L226 Difference]: Without dead ends: 13 [2023-11-19 05:09:16,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:09:16,834 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 9 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:16,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 4 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:09:16,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-19 05:09:16,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-19 05:09:16,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-19 05:09:16,850 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 9 [2023-11-19 05:09:16,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:16,851 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-19 05:09:16,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:16,852 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-19 05:09:16,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 05:09:16,853 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:16,853 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:16,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:17,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:17,073 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:17,074 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:17,074 INFO L85 PathProgramCache]: Analyzing trace with hash 792964949, now seen corresponding path program 1 times [2023-11-19 05:09:17,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:17,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375900500] [2023-11-19 05:09:17,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:17,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:17,115 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:09:17,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1171224887] [2023-11-19 05:09:17,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:17,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:17,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:17,141 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:17,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:09:17,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:17,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 36 conjunts are in the unsatisfiable core [2023-11-19 05:09:17,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:17,306 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:09:17,329 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:09:17,395 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-19 05:09:17,547 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-19 05:09:17,666 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-19 05:09:17,764 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-19 05:09:17,865 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:09:17,866 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:09:19,916 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:09:19,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:19,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375900500] [2023-11-19 05:09:19,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:09:19,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171224887] [2023-11-19 05:09:19,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171224887] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:09:19,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [790688199] [2023-11-19 05:09:19,938 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:09:19,939 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:09:19,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:09:19,950 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:09:19,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:09:20,807 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:09:21,206 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '246#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:09:21,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:09:21,207 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:09:21,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2023-11-19 05:09:21,207 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3203664] [2023-11-19 05:09:21,207 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:09:21,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 05:09:21,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:21,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 05:09:21,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=480, Unknown=0, NotChecked=0, Total=552 [2023-11-19 05:09:21,211 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:23,346 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-19 05:09:23,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:23,846 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2023-11-19 05:09:23,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:09:23,849 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 05:09:23,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:23,850 INFO L225 Difference]: With dead ends: 27 [2023-11-19 05:09:23,850 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:09:23,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2023-11-19 05:09:23,852 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:23,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 31 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 234 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2023-11-19 05:09:23,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:09:23,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2023-11-19 05:09:23,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:23,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2023-11-19 05:09:23,865 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2023-11-19 05:09:23,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:23,865 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2023-11-19 05:09:23,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:23,866 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2023-11-19 05:09:23,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:09:23,867 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:23,868 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:23,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:24,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:24,084 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:24,085 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:24,085 INFO L85 PathProgramCache]: Analyzing trace with hash -911807493, now seen corresponding path program 2 times [2023-11-19 05:09:24,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:24,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840993134] [2023-11-19 05:09:24,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:24,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:24,112 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:09:24,112 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1755127568] [2023-11-19 05:09:24,113 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:09:24,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:24,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:24,114 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:24,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:09:24,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:09:24,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:09:24,189 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:09:24,191 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:24,231 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:09:24,231 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:09:24,269 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:09:24,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:24,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840993134] [2023-11-19 05:09:24,270 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:09:24,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755127568] [2023-11-19 05:09:24,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755127568] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:09:24,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97349719] [2023-11-19 05:09:24,274 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:09:24,274 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:09:24,274 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:09:24,275 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:09:24,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:09:24,906 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:09:25,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '416#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:09:25,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:09:25,132 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:09:25,132 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-11-19 05:09:25,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112885817] [2023-11-19 05:09:25,133 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:09:25,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:09:25,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:25,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:09:25,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:09:25,134 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:25,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:25,306 INFO L93 Difference]: Finished difference Result 31 states and 41 transitions. [2023-11-19 05:09:25,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:09:25,307 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:09:25,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:25,308 INFO L225 Difference]: With dead ends: 31 [2023-11-19 05:09:25,308 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:09:25,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 17 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:09:25,310 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 6 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:25,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 8 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:09:25,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:09:25,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-11-19 05:09:25,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:25,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2023-11-19 05:09:25,319 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 13 [2023-11-19 05:09:25,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:25,319 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2023-11-19 05:09:25,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:25,319 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2023-11-19 05:09:25,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:09:25,320 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:25,320 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:25,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:25,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:25,537 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:25,538 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:25,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1188195942, now seen corresponding path program 3 times [2023-11-19 05:09:25,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:25,538 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835308892] [2023-11-19 05:09:25,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:25,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:25,567 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:09:25,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [179117897] [2023-11-19 05:09:25,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:09:25,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:25,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:25,569 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:25,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:09:25,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:09:25,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:09:25,641 INFO L262 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:09:25,644 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:25,690 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:09:25,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:09:25,730 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:09:25,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:25,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835308892] [2023-11-19 05:09:25,731 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:09:25,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179117897] [2023-11-19 05:09:25,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179117897] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:09:25,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1433753109] [2023-11-19 05:09:25,736 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:09:25,737 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:09:25,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:09:25,737 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:09:25,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:09:27,047 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:09:27,290 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '600#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:09:27,290 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:09:27,290 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:09:27,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-11-19 05:09:27,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208830645] [2023-11-19 05:09:27,291 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:09:27,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:09:27,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:27,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:09:27,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:09:27,292 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:27,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:27,392 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2023-11-19 05:09:27,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:09:27,393 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:09:27,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:27,394 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:09:27,394 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:09:27,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:09:27,395 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:27,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:09:27,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:09:27,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:09:27,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:27,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2023-11-19 05:09:27,405 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2023-11-19 05:09:27,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:27,405 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2023-11-19 05:09:27,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:27,406 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2023-11-19 05:09:27,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-19 05:09:27,407 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:27,407 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:27,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:27,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:27,608 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:09:27,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:27,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1993429225, now seen corresponding path program 4 times [2023-11-19 05:09:27,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:27,608 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076441035] [2023-11-19 05:09:27,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:27,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:27,646 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:09:27,647 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1592237095] [2023-11-19 05:09:27,647 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:09:27,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:27,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:27,653 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:27,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:09:27,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:27,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 55 conjunts are in the unsatisfiable core [2023-11-19 05:09:27,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:27,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:09:27,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:09:27,815 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-19 05:09:27,867 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-19 05:09:27,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,010 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,117 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,176 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,285 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,353 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 05:09:28,434 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:09:28,434 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:09:47,131 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:09:47,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:47,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076441035] [2023-11-19 05:09:47,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:09:47,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592237095] [2023-11-19 05:09:47,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592237095] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:09:47,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1014424093] [2023-11-19 05:09:47,135 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:09:47,135 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:09:47,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:09:47,136 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:09:47,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:09:47,521 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:09:50,200 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '814#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:09:50,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:09:50,200 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:09:50,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2023-11-19 05:09:50,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141340941] [2023-11-19 05:09:50,201 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:09:50,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-19 05:09:50,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:50,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-19 05:09:50,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=879, Unknown=3, NotChecked=0, Total=992 [2023-11-19 05:09:50,204 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:09:53,589 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse8 (+ 8 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse13 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse0 (+ (* c_~N~0 2) (* c_~N~0 c_~N~0)))) (and (or (< |c_ULTIMATE.start_main_~i~0#1| c_~N~0) (= .cse0 (let ((.cse12 (select |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse1 (select .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset|)) (.cse7 (select .cse13 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse2 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse7))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8))) (let ((.cse9 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse2 .cse7))))) (let ((.cse11 (select .cse9 |c_ULTIMATE.start_main_~a~0#1.base|))) (let ((.cse3 (select .cse11 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse4 (let ((.cse10 (store .cse11 |c_ULTIMATE.start_main_~a~0#1.offset| (+ .cse1 .cse2 .cse3 .cse7)))) (store .cse10 .cse8 (+ (select .cse11 .cse8) (select (select (store .cse9 |c_ULTIMATE.start_main_~a~0#1.base| .cse10) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|)))))) (let ((.cse5 (select (store .cse9 |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse6 (select .cse5 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse1 .cse2 .cse3 (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse5 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse2 .cse3 .cse6 .cse7))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8) .cse6 .cse7)))))))))))) (or (= (let ((.cse27 (store .cse13 (+ (* 8 |c_ULTIMATE.start_main_~i~0#1|) |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) (let ((.cse25 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse27))) (let ((.cse26 (select .cse25 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse14 (select .cse26 |c_ULTIMATE.start_main_~#sum~0#1.offset|)) (.cse20 (select .cse27 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse19 (select (select (store .cse25 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse26 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse14 .cse20))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8))) (let ((.cse24 (store .cse26 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse14 .cse19 .cse20)))) (let ((.cse23 (select (store .cse25 |c_ULTIMATE.start_main_~#sum~0#1.base| .cse24) |c_ULTIMATE.start_main_~a~0#1.base|))) (let ((.cse21 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| .cse24)) (.cse18 (select .cse23 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse16 (let ((.cse22 (store .cse23 |c_ULTIMATE.start_main_~a~0#1.offset| (+ .cse14 .cse18 .cse19 .cse20)))) (store .cse22 .cse8 (+ (select (select (store .cse21 |c_ULTIMATE.start_main_~a~0#1.base| .cse22) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) (select .cse23 .cse8)))))) (let ((.cse17 (select (store .cse21 |c_ULTIMATE.start_main_~a~0#1.base| .cse16) |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse15 (select .cse17 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse14 .cse15 (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse16) |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse17 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse14 .cse15 .cse18 .cse19 .cse20))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8) .cse18 .cse19 .cse20)))))))))))) .cse0) (not (= (+ |c_ULTIMATE.start_main_~i~0#1| 1) c_~N~0))))) is different from true [2023-11-19 05:09:59,792 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.74s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-19 05:10:01,952 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-19 05:10:03,965 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse12 (select |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse0 (+ (* c_~N~0 2) (* c_~N~0 c_~N~0))) (.cse8 (+ 8 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse1 (select .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset|)) (.cse13 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|))) (and (or (< |c_ULTIMATE.start_main_~i~0#1| c_~N~0) (= .cse0 (let ((.cse7 (select .cse13 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse2 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse7))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8))) (let ((.cse9 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse2 .cse7))))) (let ((.cse11 (select .cse9 |c_ULTIMATE.start_main_~a~0#1.base|))) (let ((.cse3 (select .cse11 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse4 (let ((.cse10 (store .cse11 |c_ULTIMATE.start_main_~a~0#1.offset| (+ .cse1 .cse2 .cse3 .cse7)))) (store .cse10 .cse8 (+ (select .cse11 .cse8) (select (select (store .cse9 |c_ULTIMATE.start_main_~a~0#1.base| .cse10) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|)))))) (let ((.cse5 (select (store .cse9 |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse6 (select .cse5 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse1 .cse2 .cse3 (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse4) |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse5 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse2 .cse3 .cse6 .cse7))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8) .cse6 .cse7))))))))))) (= .cse0 (let ((.cse23 (* 8 |c_ULTIMATE.start_main_~i~0#1|))) (let ((.cse14 (select .cse13 (+ .cse23 |c_ULTIMATE.start_main_~a~0#1.offset|)))) (let ((.cse19 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse14))) |c_ULTIMATE.start_main_~a~0#1.base|) (+ .cse23 8 |c_ULTIMATE.start_main_~a~0#1.offset|)))) (let ((.cse20 (store |c_#memory_int| |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse14 .cse19))))) (let ((.cse22 (select .cse20 |c_ULTIMATE.start_main_~a~0#1.base|))) (let ((.cse17 (select .cse22 |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse15 (let ((.cse21 (store .cse22 |c_ULTIMATE.start_main_~a~0#1.offset| (+ .cse1 .cse14 .cse17 .cse19)))) (store .cse21 .cse8 (+ (select (select (store .cse20 |c_ULTIMATE.start_main_~a~0#1.base| .cse21) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|) (select .cse22 .cse8)))))) (let ((.cse16 (select (store .cse20 |c_ULTIMATE.start_main_~a~0#1.base| .cse15) |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse18 (select .cse16 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse1 .cse14 (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse15) |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse16 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 .cse14 .cse17 .cse18 .cse19))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse8) .cse17 .cse18 .cse19)))))))))))))) is different from false [2023-11-19 05:10:07,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:10:07,310 INFO L93 Difference]: Finished difference Result 40 states and 52 transitions. [2023-11-19 05:10:07,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-19 05:10:07,312 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-19 05:10:07,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:10:07,313 INFO L225 Difference]: With dead ends: 40 [2023-11-19 05:10:07,313 INFO L226 Difference]: Without dead ends: 33 [2023-11-19 05:10:07,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=170, Invalid=1315, Unknown=5, NotChecked=150, Total=1640 [2023-11-19 05:10:07,315 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 8 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 24 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:10:07,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 35 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 320 Invalid, 1 Unknown, 78 Unchecked, 6.8s Time] [2023-11-19 05:10:07,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-19 05:10:07,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 25. [2023-11-19 05:10:07,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:07,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-11-19 05:10:07,330 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 16 [2023-11-19 05:10:07,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:10:07,330 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-11-19 05:10:07,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:07,330 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-11-19 05:10:07,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-19 05:10:07,331 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:10:07,331 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:10:07,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:10:07,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:10:07,532 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:10:07,532 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:10:07,532 INFO L85 PathProgramCache]: Analyzing trace with hash 2119813775, now seen corresponding path program 5 times [2023-11-19 05:10:07,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:10:07,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774456186] [2023-11-19 05:10:07,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:10:07,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:10:07,558 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:10:07,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2097441866] [2023-11-19 05:10:07,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:10:07,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:10:07,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:10:07,560 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:10:07,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:10:07,674 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:10:07,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:10:07,675 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:10:07,677 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:10:07,748 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:10:07,748 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:10:07,798 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:10:07,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:10:07,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774456186] [2023-11-19 05:10:07,798 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:10:07,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097441866] [2023-11-19 05:10:07,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097441866] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:10:07,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159270290] [2023-11-19 05:10:07,801 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:10:07,801 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:10:07,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:10:07,802 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:10:07,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:10:08,656 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:10:08,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1061#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:10:08,887 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:10:08,887 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:10:08,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-11-19 05:10:08,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000687433] [2023-11-19 05:10:08,887 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:10:08,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:10:08,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:10:08,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:10:08,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:10:08,889 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:09,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:10:09,082 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2023-11-19 05:10:09,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:10:09,082 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-19 05:10:09,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:10:09,083 INFO L225 Difference]: With dead ends: 41 [2023-11-19 05:10:09,083 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 05:10:09,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 24 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:10:09,085 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 12 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:10:09,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 4 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:10:09,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 05:10:09,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2023-11-19 05:10:09,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:09,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2023-11-19 05:10:09,101 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 17 [2023-11-19 05:10:09,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:10:09,102 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2023-11-19 05:10:09,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:09,102 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2023-11-19 05:10:09,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-19 05:10:09,103 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:10:09,103 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:10:09,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:10:09,305 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:10:09,306 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:10:09,306 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:10:09,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1666458246, now seen corresponding path program 6 times [2023-11-19 05:10:09,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:10:09,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703397123] [2023-11-19 05:10:09,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:10:09,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:10:09,333 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:10:09,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [805638582] [2023-11-19 05:10:09,334 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:10:09,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:10:09,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:10:09,348 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:10:09,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:10:09,414 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:10:09,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:10:09,416 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:10:09,417 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:10:09,504 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:10:09,504 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:10:09,576 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:10:09,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:10:09,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703397123] [2023-11-19 05:10:09,576 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:10:09,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805638582] [2023-11-19 05:10:09,576 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805638582] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:10:09,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [787304219] [2023-11-19 05:10:09,578 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:10:09,579 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:10:09,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:10:09,579 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:10:09,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:10:10,681 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:10:10,895 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1307#(and (not (= (+ (* 2 ~N~0) (* ~N~0 ~N~0)) |ULTIMATE.start_main_#t~mem16#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem16#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-19 05:10:10,895 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:10:10,895 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:10:10,895 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2023-11-19 05:10:10,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959728855] [2023-11-19 05:10:10,896 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:10:10,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:10:10,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:10:10,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:10:10,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:10:10,897 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:11,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:10:11,050 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2023-11-19 05:10:11,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:10:11,052 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-19 05:10:11,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:10:11,053 INFO L225 Difference]: With dead ends: 42 [2023-11-19 05:10:11,053 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:10:11,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=92, Invalid=288, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:10:11,055 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 4 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:10:11,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:10:11,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:10:11,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-19 05:10:11,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.2) internal successors, (24), 20 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:11,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-11-19 05:10:11,080 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2023-11-19 05:10:11,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:10:11,080 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-11-19 05:10:11,080 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:10:11,080 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-11-19 05:10:11,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:10:11,081 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:10:11,081 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:10:11,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:10:11,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 05:10:11,282 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:10:11,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:10:11,282 INFO L85 PathProgramCache]: Analyzing trace with hash -72472683, now seen corresponding path program 7 times [2023-11-19 05:10:11,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:10:11,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577701323] [2023-11-19 05:10:11,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:10:11,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:10:11,311 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:10:11,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1303080365] [2023-11-19 05:10:11,312 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:10:11,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:10:11,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:10:11,313 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:10:11,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98ec4658-6cd5-4527-a33c-47ac5354ee6e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:10:11,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:10:11,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 76 conjunts are in the unsatisfiable core [2023-11-19 05:10:11,427 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:10:11,447 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:10:11,453 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:10:11,480 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-19 05:10:11,528 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-19 05:10:11,588 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2023-11-19 05:10:11,717 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:11,802 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:11,883 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,118 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,235 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,371 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,454 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,541 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 41 [2023-11-19 05:10:12,657 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:10:12,657 INFO L327 TraceCheckSpWp]: Computing backward predicates...