./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/pnr3.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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/pnr3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/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 e32269e91be552d606173d0b8eafd4ffa81c0e735dd375e4417d1ccfc27eaf5e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:48:51,375 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:48:51,477 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:48:51,481 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:48:51,482 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:48:51,508 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:48:51,508 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:48:51,509 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:48:51,510 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:48:51,511 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:48:51,511 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:48:51,512 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:48:51,512 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:48:51,513 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:48:51,513 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:48:51,514 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:48:51,515 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:48:51,515 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:48:51,516 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:48:51,516 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:48:51,517 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:48:51,517 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:48:51,518 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:48:51,518 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:48:51,519 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:48:51,519 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:48:51,520 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:48:51,520 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:48:51,520 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:48:51,521 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:48:51,521 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:48:51,522 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:48:51,522 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:48:51,522 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:48:51,523 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:48:51,523 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:48:51,523 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:48:51,523 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:48:51,524 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:48:51,524 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:48:51,524 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:48:51,525 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:48:51,525 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:48:51,525 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:48:51,525 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:48:51,525 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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e32269e91be552d606173d0b8eafd4ffa81c0e735dd375e4417d1ccfc27eaf5e [2023-11-19 04:48:51,834 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:48:51,861 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:48:51,865 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:48:51,866 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:48:51,867 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:48:51,870 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-tiling/pnr3.c [2023-11-19 04:48:54,989 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:48:55,170 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:48:55,171 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/sv-benchmarks/c/array-tiling/pnr3.c [2023-11-19 04:48:55,179 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/data/9d0303f9c/3335d9e5e6b94a8aac95f0d1101ff86c/FLAGf5d373a50 [2023-11-19 04:48:55,195 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/data/9d0303f9c/3335d9e5e6b94a8aac95f0d1101ff86c [2023-11-19 04:48:55,198 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:48:55,199 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:48:55,201 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:48:55,201 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:48:55,208 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:48:55,211 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,212 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f101709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55, skipping insertion in model container [2023-11-19 04:48:55,213 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,243 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:48:55,431 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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/sv-benchmarks/c/array-tiling/pnr3.c[395,408] [2023-11-19 04:48:55,459 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:48:55,470 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:48:55,484 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_8e1d59a1-59a5-482b-8c73-13ee7dd16790/sv-benchmarks/c/array-tiling/pnr3.c[395,408] [2023-11-19 04:48:55,495 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:48:55,513 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:48:55,513 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55 WrapperNode [2023-11-19 04:48:55,514 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:48:55,515 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:48:55,515 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:48:55,516 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:48:55,524 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,532 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,564 INFO L138 Inliner]: procedures = 17, calls = 27, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 85 [2023-11-19 04:48:55,564 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:48:55,568 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:48:55,568 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:48:55,569 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:48:55,578 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,578 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,580 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,581 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,587 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,592 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,593 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,595 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,597 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:48:55,598 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:48:55,599 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:48:55,599 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:48:55,600 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (1/1) ... [2023-11-19 04:48:55,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:48:55,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:48:55,637 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:48:55,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:48:55,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:48:55,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:48:55,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 04:48:55,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 04:48:55,691 INFO L130 BoogieDeclarations]: Found specification of procedure ReadFromPort [2023-11-19 04:48:55,691 INFO L138 BoogieDeclarations]: Found implementation of procedure ReadFromPort [2023-11-19 04:48:55,693 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:48:55,694 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:48:55,694 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 04:48:55,834 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:48:55,836 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:48:56,206 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:48:56,265 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:48:56,265 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 04:48:56,270 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:48:56 BoogieIcfgContainer [2023-11-19 04:48:56,270 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:48:56,273 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:48:56,273 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:48:56,276 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:48:56,277 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:48:55" (1/3) ... [2023-11-19 04:48:56,277 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@658eb174 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:48:56, skipping insertion in model container [2023-11-19 04:48:56,278 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:48:55" (2/3) ... [2023-11-19 04:48:56,278 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@658eb174 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:48:56, skipping insertion in model container [2023-11-19 04:48:56,278 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:48:56" (3/3) ... [2023-11-19 04:48:56,280 INFO L112 eAbstractionObserver]: Analyzing ICFG pnr3.c [2023-11-19 04:48:56,299 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:48:56,299 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:48:56,342 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:48:56,350 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;@12032cac, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:48:56,350 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:48:56,354 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:48:56,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:48:56,362 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:48:56,363 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:48:56,363 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:48:56,369 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:48:56,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1344502422, now seen corresponding path program 1 times [2023-11-19 04:48:56,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:48:56,379 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578651384] [2023-11-19 04:48:56,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:48:56,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:48:56,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:48:56,813 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 04:48:56,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:48:56,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578651384] [2023-11-19 04:48:56,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578651384] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:48:56,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:48:56,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 04:48:56,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361526317] [2023-11-19 04:48:56,822 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:48:56,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:48:56,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:48:56,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:48:56,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:48:56,873 INFO L87 Difference]: Start difference. First operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:48:56,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:48:56,971 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2023-11-19 04:48:56,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 04:48:56,974 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 04:48:56,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:48:56,981 INFO L225 Difference]: With dead ends: 38 [2023-11-19 04:48:56,981 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 04:48:56,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 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 04:48:56,994 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 31 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:48:56,995 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 15 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:48:57,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 04:48:57,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2023-11-19 04:48:57,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:48:57,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2023-11-19 04:48:57,115 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 7 [2023-11-19 04:48:57,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:48:57,115 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2023-11-19 04:48:57,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:48:57,116 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2023-11-19 04:48:57,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 04:48:57,117 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:48:57,117 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:48:57,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:48:57,118 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:48:57,119 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:48:57,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1183958806, now seen corresponding path program 1 times [2023-11-19 04:48:57,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:48:57,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876065135] [2023-11-19 04:48:57,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:48:57,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:48:57,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:48:58,241 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:48:58,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:48:58,242 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876065135] [2023-11-19 04:48:58,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876065135] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:48:58,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881496254] [2023-11-19 04:48:58,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:48:58,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:48:58,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:48:58,248 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:48:58,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:48:58,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:48:58,373 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-19 04:48:58,385 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:48:58,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 39 [2023-11-19 04:48:58,656 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 5 treesize of output 3 [2023-11-19 04:48:58,675 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 16 treesize of output 5 [2023-11-19 04:48:58,681 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 5 treesize of output 3 [2023-11-19 04:48:58,767 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 57 [2023-11-19 04:48:58,800 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 35 treesize of output 21 [2023-11-19 04:48:58,805 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 21 treesize of output 15 [2023-11-19 04:48:58,858 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 57 [2023-11-19 04:48:58,885 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 15 treesize of output 11 [2023-11-19 04:48:58,904 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 28 treesize of output 16 [2023-11-19 04:48:58,908 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 16 treesize of output 12 [2023-11-19 04:48:59,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:48:59,010 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:48:59,238 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:48:59,238 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 54 [2023-11-19 04:48:59,276 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-19 04:48:59,277 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 11 [2023-11-19 04:48:59,284 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 6 treesize of output 4 [2023-11-19 04:48:59,294 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:48:59,294 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 20 [2023-11-19 04:48:59,349 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:48:59,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881496254] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:48:59,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452712357] [2023-11-19 04:48:59,370 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 04:48:59,371 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:48:59,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:48:59,380 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:48:59,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:49:06,543 INFO L197 IcfgInterpreter]: Interpreting procedure ReadFromPort with input of size 60 for LOIs [2023-11-19 04:49:06,572 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:49:07,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= |ULTIMATE.start_main_~DEFAULTVAL~0#1| 0) (<= 2 ~SIZE~0) (= 10 |ULTIMATE.start_main_~FIXEDVAL~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem12#1| 0) (<= ~SIZE~0 99999) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) 0) 0))' at error location [2023-11-19 04:49:07,867 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:49:07,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:49:07,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 18 [2023-11-19 04:49:07,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559038412] [2023-11-19 04:49:07,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:49:07,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 04:49:07,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:49:07,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 04:49:07,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=778, Unknown=9, NotChecked=0, Total=930 [2023-11-19 04:49:07,873 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-19 04:49:08,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:49:08,285 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2023-11-19 04:49:08,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:49:08,286 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 20 [2023-11-19 04:49:08,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:49:08,287 INFO L225 Difference]: With dead ends: 41 [2023-11-19 04:49:08,288 INFO L226 Difference]: Without dead ends: 39 [2023-11-19 04:49:08,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=249, Invalid=1224, Unknown=9, NotChecked=0, Total=1482 [2023-11-19 04:49:08,290 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 97 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:49:08,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 57 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:49:08,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-19 04:49:08,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 20. [2023-11-19 04:49:08,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:49:08,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-11-19 04:49:08,300 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 20 [2023-11-19 04:49:08,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:49:08,300 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-11-19 04:49:08,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 6 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-19 04:49:08,301 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-11-19 04:49:08,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:49:08,302 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:49:08,302 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:49:08,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:49:08,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:08,524 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:49:08,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:49:08,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1039898973, now seen corresponding path program 1 times [2023-11-19 04:49:08,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:49:08,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689451862] [2023-11-19 04:49:08,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:49:08,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:49:08,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:09,110 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:09,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:49:09,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689451862] [2023-11-19 04:49:09,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689451862] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:49:09,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130226341] [2023-11-19 04:49:09,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:49:09,112 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:09,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:49:09,113 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:49:09,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:49:09,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:09,189 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-19 04:49:09,192 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:49:09,287 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 15 treesize of output 1 [2023-11-19 04:49:09,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 04:49:09,293 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 1 [2023-11-19 04:49:09,378 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 57 [2023-11-19 04:49:09,402 WARN L214 Elim1Store]: Array PQE input equivalent to false [2023-11-19 04:49:09,408 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 21 treesize of output 15 [2023-11-19 04:49:09,552 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:49:09,553 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:49:11,707 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:49:11,708 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 54 [2023-11-19 04:49:11,731 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 11 treesize of output 4 [2023-11-19 04:49:11,743 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-19 04:49:11,744 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 11 [2023-11-19 04:49:11,756 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:49:11,757 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 21 [2023-11-19 04:49:11,813 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:11,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130226341] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:49:11,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557007630] [2023-11-19 04:49:11,816 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 04:49:11,816 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:49:11,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:49:11,817 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:49:11,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:49:16,381 INFO L197 IcfgInterpreter]: Interpreting procedure ReadFromPort with input of size 60 for LOIs [2023-11-19 04:49:16,399 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:49:25,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '503#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start_main_~DEFAULTVAL~0#1| 0) (<= 2 ~SIZE~0) (= 10 |ULTIMATE.start_main_~FIXEDVAL~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~i~0#1| 99998) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= ~SIZE~0 99999) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:49:25,659 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:49:25,659 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:49:25,659 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 9] total 24 [2023-11-19 04:49:25,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045447553] [2023-11-19 04:49:25,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:49:25,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-19 04:49:25,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:49:25,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-19 04:49:25,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1187, Unknown=16, NotChecked=0, Total=1406 [2023-11-19 04:49:25,663 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-19 04:49:30,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:49:30,228 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2023-11-19 04:49:30,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 04:49:30,229 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 23 [2023-11-19 04:49:30,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:49:30,230 INFO L225 Difference]: With dead ends: 39 [2023-11-19 04:49:30,230 INFO L226 Difference]: Without dead ends: 37 [2023-11-19 04:49:30,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=350, Invalid=1888, Unknown=18, NotChecked=0, Total=2256 [2023-11-19 04:49:30,233 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 45 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:49:30,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 52 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:49:30,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-19 04:49:30,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 23. [2023-11-19 04:49:30,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:49:30,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-19 04:49:30,245 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 23 [2023-11-19 04:49:30,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:49:30,246 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-19 04:49:30,246 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-19 04:49:30,246 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-19 04:49:30,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 04:49:30,247 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:49:30,247 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:49:30,266 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-19 04:49:30,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-19 04:49:30,456 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:49:30,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:49:30,456 INFO L85 PathProgramCache]: Analyzing trace with hash -25742774, now seen corresponding path program 2 times [2023-11-19 04:49:30,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:49:30,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123991334] [2023-11-19 04:49:30,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:49:30,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:49:30,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:30,865 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:30,865 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:49:30,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123991334] [2023-11-19 04:49:30,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123991334] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:49:30,865 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498679037] [2023-11-19 04:49:30,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:49:30,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:30,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:49:30,867 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:49:30,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:49:30,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 04:49:30,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:49:30,946 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-19 04:49:30,949 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:49:31,066 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 04:49:31,073 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-19 04:49:31,247 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:31,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:49:31,328 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:49:31,329 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 54 [2023-11-19 04:49:31,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 58 treesize of output 42 [2023-11-19 04:49:31,361 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-19 04:49:31,361 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 11 [2023-11-19 04:49:31,376 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 8 treesize of output 4 [2023-11-19 04:49:31,385 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 04:49:31,385 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 21 [2023-11-19 04:49:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:31,458 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498679037] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:49:31,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595216032] [2023-11-19 04:49:31,460 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 04:49:31,460 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:49:31,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:49:31,461 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:49:31,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:49:35,647 INFO L197 IcfgInterpreter]: Interpreting procedure ReadFromPort with input of size 60 for LOIs [2023-11-19 04:49:35,665 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:49:36,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '793#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start_main_~DEFAULTVAL~0#1| 0) (<= 2 ~SIZE~0) (= 10 |ULTIMATE.start_main_~FIXEDVAL~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~i~0#1| 99998) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= ~SIZE~0 99999) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:49:36,874 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:49:36,874 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:49:36,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2023-11-19 04:49:36,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762532386] [2023-11-19 04:49:36,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:49:36,875 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 04:49:36,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:49:36,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 04:49:36,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=888, Unknown=16, NotChecked=0, Total=1056 [2023-11-19 04:49:36,878 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:49:37,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:49:37,622 INFO L93 Difference]: Finished difference Result 63 states and 85 transitions. [2023-11-19 04:49:37,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-19 04:49:37,623 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 26 [2023-11-19 04:49:37,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:49:37,625 INFO L225 Difference]: With dead ends: 63 [2023-11-19 04:49:37,625 INFO L226 Difference]: Without dead ends: 61 [2023-11-19 04:49:37,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=321, Invalid=1825, Unknown=16, NotChecked=0, Total=2162 [2023-11-19 04:49:37,627 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 161 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 04:49:37,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 81 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 04:49:37,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-19 04:49:37,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 26. [2023-11-19 04:49:37,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 21 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 04:49:37,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-11-19 04:49:37,640 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 26 [2023-11-19 04:49:37,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:49:37,640 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-11-19 04:49:37,641 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:49:37,641 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-11-19 04:49:37,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-19 04:49:37,642 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:49:37,642 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:49:37,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:49:37,847 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:37,848 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:49:37,849 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:49:37,849 INFO L85 PathProgramCache]: Analyzing trace with hash 1901621571, now seen corresponding path program 3 times [2023-11-19 04:49:37,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:49:37,849 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342156349] [2023-11-19 04:49:37,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:49:37,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:49:37,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:38,133 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:38,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:49:38,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342156349] [2023-11-19 04:49:38,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342156349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:49:38,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143697464] [2023-11-19 04:49:38,134 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:49:38,134 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:38,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:49:38,136 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:49:38,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:49:38,226 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:49:38,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:49:38,228 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 04:49:38,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:49:38,580 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:38,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:49:38,749 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:49:38,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143697464] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:49:38,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1650936401] [2023-11-19 04:49:38,754 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 04:49:38,754 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:49:38,755 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:49:38,755 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:49:38,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:49:42,574 INFO L197 IcfgInterpreter]: Interpreting procedure ReadFromPort with input of size 60 for LOIs [2023-11-19 04:49:42,591 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:49:43,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1153#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (= |ULTIMATE.start_main_~DEFAULTVAL~0#1| 0) (<= 2 ~SIZE~0) (= 10 |ULTIMATE.start_main_~FIXEDVAL~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~i~0#1| 99998) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= ~SIZE~0 99999) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:49:43,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:49:43,827 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:49:43,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 22 [2023-11-19 04:49:43,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432909409] [2023-11-19 04:49:43,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:49:43,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-19 04:49:43,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:49:43,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-19 04:49:43,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1065, Unknown=12, NotChecked=0, Total=1260 [2023-11-19 04:49:43,830 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 22 states, 22 states have (on average 2.5) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:49:44,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:49:44,233 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2023-11-19 04:49:44,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:49:44,233 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 29 [2023-11-19 04:49:44,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:49:44,234 INFO L225 Difference]: With dead ends: 54 [2023-11-19 04:49:44,234 INFO L226 Difference]: Without dead ends: 39 [2023-11-19 04:49:44,236 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=302, Invalid=1666, Unknown=12, NotChecked=0, Total=1980 [2023-11-19 04:49:44,237 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 89 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:49:44,237 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 37 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:49:44,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-19 04:49:44,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33. [2023-11-19 04:49:44,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 6 states have call successors, (6), 1 states have call predecessors, (6), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-19 04:49:44,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2023-11-19 04:49:44,249 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 29 [2023-11-19 04:49:44,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:49:44,250 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2023-11-19 04:49:44,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-19 04:49:44,250 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2023-11-19 04:49:44,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-19 04:49:44,251 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:49:44,252 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:49:44,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:49:44,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:44,456 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:49:44,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:49:44,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1893271401, now seen corresponding path program 4 times [2023-11-19 04:49:44,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:49:44,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347316241] [2023-11-19 04:49:44,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:49:44,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:49:44,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:45,471 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-19 04:49:45,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:49:45,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347316241] [2023-11-19 04:49:45,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347316241] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:49:45,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556274219] [2023-11-19 04:49:45,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:49:45,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:49:45,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:49:45,473 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:49:45,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8e1d59a1-59a5-482b-8c73-13ee7dd16790/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:49:45,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:49:45,581 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-19 04:49:45,586 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:49:45,743 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 39 [2023-11-19 04:49:45,758 WARN L214 Elim1Store]: Array PQE input equivalent to false [2023-11-19 04:49:45,764 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 5 treesize of output 3 [2023-11-19 04:49:45,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 57 [2023-11-19 04:49:45,876 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 16 treesize of output 12 [2023-11-19 04:49:45,885 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 27 treesize of output 15 [2023-11-19 04:49:45,890 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 15 treesize of output 11 [2023-11-19 04:49:45,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 57 [2023-11-19 04:49:45,979 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 9 treesize of output 7 [2023-11-19 04:49:45,997 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 35 treesize of output 21 [2023-11-19 04:49:45,999 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 21 treesize of output 15 [2023-11-19 04:49:46,251 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 16 proven. 24 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 04:49:46,251 INFO L327 TraceCheckSpWp]: Computing backward predicates...