./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de41.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_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/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_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de41.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/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_db49530d-481f-4b0b-bef1-9c33d6160bc5/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 71e52c2f7da6d5380080fb621ed04f7c322fd22e434b0426cf7577ab025ae680 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:57:41,131 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:57:41,252 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:57:41,266 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:57:41,267 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:57:41,312 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:57:41,313 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:57:41,313 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:57:41,315 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:57:41,320 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:57:41,320 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:57:41,321 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:57:41,322 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:57:41,324 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:57:41,324 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:57:41,325 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:57:41,325 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:57:41,326 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:57:41,326 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:57:41,327 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:57:41,327 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:57:41,328 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:57:41,329 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:57:41,330 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:57:41,330 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:57:41,330 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:57:41,331 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:57:41,331 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:57:41,332 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:57:41,332 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:57:41,333 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:57:41,334 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:57:41,334 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:57:41,334 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:57:41,335 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:57:41,335 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:57:41,335 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:57:41,336 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:57:41,336 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:57:41,336 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:57:41,336 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:57:41,337 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:57:41,337 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:57:41,337 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:57:41,338 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:57:41,338 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_db49530d-481f-4b0b-bef1-9c33d6160bc5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71e52c2f7da6d5380080fb621ed04f7c322fd22e434b0426cf7577ab025ae680 [2023-11-19 04:57:41,631 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:57:41,654 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:57:41,656 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:57:41,658 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:57:41,658 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:57:41,660 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loops-crafted-1/in-de41.c [2023-11-19 04:57:44,870 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:57:45,103 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:57:45,103 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/sv-benchmarks/c/loops-crafted-1/in-de41.c [2023-11-19 04:57:45,111 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/data/7509c4a50/ed0c415c0bcc44d3b9d284b278d36282/FLAGccc027caf [2023-11-19 04:57:45,126 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/data/7509c4a50/ed0c415c0bcc44d3b9d284b278d36282 [2023-11-19 04:57:45,129 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:57:45,130 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:57:45,132 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:57:45,132 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:57:45,138 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:57:45,139 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,140 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@559a4fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45, skipping insertion in model container [2023-11-19 04:57:45,140 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,161 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:57:45,318 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_db49530d-481f-4b0b-bef1-9c33d6160bc5/sv-benchmarks/c/loops-crafted-1/in-de41.c[368,381] [2023-11-19 04:57:45,336 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:57:45,348 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:57:45,360 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_db49530d-481f-4b0b-bef1-9c33d6160bc5/sv-benchmarks/c/loops-crafted-1/in-de41.c[368,381] [2023-11-19 04:57:45,365 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:57:45,380 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:57:45,380 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45 WrapperNode [2023-11-19 04:57:45,380 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:57:45,382 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:57:45,382 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:57:45,382 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:57:45,390 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,399 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,421 INFO L138 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2023-11-19 04:57:45,422 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:57:45,422 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:57:45,423 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:57:45,423 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:57:45,432 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,432 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,434 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,434 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,437 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,441 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,442 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,443 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,445 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:57:45,446 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:57:45,446 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:57:45,446 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:57:45,448 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (1/1) ... [2023-11-19 04:57:45,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:57:45,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:45,476 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:57:45,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:57:45,508 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:57:45,509 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:57:45,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:57:45,509 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:57:45,571 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:57:45,573 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:57:45,736 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:57:45,772 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:57:45,773 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 04:57:45,777 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:45 BoogieIcfgContainer [2023-11-19 04:57:45,777 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:57:45,780 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:57:45,781 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:57:45,784 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:57:45,785 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:57:45" (1/3) ... [2023-11-19 04:57:45,786 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303e2017 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:45, skipping insertion in model container [2023-11-19 04:57:45,786 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:45" (2/3) ... [2023-11-19 04:57:45,787 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@303e2017 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:45, skipping insertion in model container [2023-11-19 04:57:45,787 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:45" (3/3) ... [2023-11-19 04:57:45,788 INFO L112 eAbstractionObserver]: Analyzing ICFG in-de41.c [2023-11-19 04:57:45,813 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:57:45,814 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:57:45,874 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:57:45,882 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;@702a2370, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:57:45,883 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:57:45,887 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:45,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:57:45,894 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:45,895 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:45,896 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:45,902 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:45,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1978268067, now seen corresponding path program 1 times [2023-11-19 04:57:45,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:45,914 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013496700] [2023-11-19 04:57:45,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:45,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:46,599 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 04:57:46,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:46,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013496700] [2023-11-19 04:57:46,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013496700] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:46,601 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:46,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 04:57:46,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251420347] [2023-11-19 04:57:46,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:46,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 04:57:46,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:46,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 04:57:46,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:46,644 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.4) 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 04:57:46,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:46,756 INFO L93 Difference]: Finished difference Result 23 states and 34 transitions. [2023-11-19 04:57:46,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:57:46,759 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) 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 04:57:46,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:46,768 INFO L225 Difference]: With dead ends: 23 [2023-11-19 04:57:46,769 INFO L226 Difference]: Without dead ends: 10 [2023-11-19 04:57:46,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-19 04:57:46,780 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:46,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 10 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:46,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-19 04:57:46,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-19 04:57:46,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:46,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 14 transitions. [2023-11-19 04:57:46,827 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 14 transitions. Word has length 7 [2023-11-19 04:57:46,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:46,828 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 14 transitions. [2023-11-19 04:57:46,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) 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 04:57:46,829 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 14 transitions. [2023-11-19 04:57:46,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 04:57:46,830 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:46,830 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:46,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:57:46,831 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:46,841 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:46,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1778622387, now seen corresponding path program 1 times [2023-11-19 04:57:46,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:46,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657579604] [2023-11-19 04:57:46,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:46,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:46,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:46,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:46,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:46,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657579604] [2023-11-19 04:57:46,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657579604] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:57:46,981 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:57:46,982 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 04:57:46,982 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815812547] [2023-11-19 04:57:46,982 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:57:46,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:57:46,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:46,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:57:46,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 04:57:46,985 INFO L87 Difference]: Start difference. First operand 10 states and 14 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:47,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:47,020 INFO L93 Difference]: Finished difference Result 16 states and 22 transitions. [2023-11-19 04:57:47,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 04:57:47,021 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 04:57:47,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:47,022 INFO L225 Difference]: With dead ends: 16 [2023-11-19 04:57:47,022 INFO L226 Difference]: Without dead ends: 9 [2023-11-19 04:57:47,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 04:57:47,025 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 1 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:47,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:57:47,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-19 04:57:47,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-19 04:57:47,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 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 04:57:47,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2023-11-19 04:57:47,030 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 8 [2023-11-19 04:57:47,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:47,031 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2023-11-19 04:57:47,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 04:57:47,032 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2023-11-19 04:57:47,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 04:57:47,032 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:47,033 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:47,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:57:47,033 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:47,034 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:47,034 INFO L85 PathProgramCache]: Analyzing trace with hash 554704646, now seen corresponding path program 1 times [2023-11-19 04:57:47,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:47,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906407559] [2023-11-19 04:57:47,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:47,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:47,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:47,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:47,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:47,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906407559] [2023-11-19 04:57:47,127 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906407559] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:47,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235866035] [2023-11-19 04:57:47,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:47,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:47,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:47,131 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:47,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:57:47,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:47,215 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:57:47,219 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:47,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:47,252 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:47,295 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:47,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235866035] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:47,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490146358] [2023-11-19 04:57:47,316 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:47,316 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:47,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:47,325 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:47,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:47,726 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:47,936 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165#(and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~z~0#1| 4294967296) 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:47,936 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:47,936 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:47,936 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-19 04:57:47,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022571025] [2023-11-19 04:57:47,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:47,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 04:57:47,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:47,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 04:57:47,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:57:47,939 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:48,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:48,101 INFO L93 Difference]: Finished difference Result 48 states and 66 transitions. [2023-11-19 04:57:48,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 04:57:48,102 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 04:57:48,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:48,104 INFO L225 Difference]: With dead ends: 48 [2023-11-19 04:57:48,104 INFO L226 Difference]: Without dead ends: 43 [2023-11-19 04:57:48,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:57:48,107 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 47 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:48,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 17 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:48,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-19 04:57:48,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 19. [2023-11-19 04:57:48,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:48,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 27 transitions. [2023-11-19 04:57:48,116 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 27 transitions. Word has length 8 [2023-11-19 04:57:48,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:48,117 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 27 transitions. [2023-11-19 04:57:48,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:48,117 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 27 transitions. [2023-11-19 04:57:48,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 04:57:48,118 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:48,118 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:48,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:48,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:48,339 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:48,340 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:48,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1791919755, now seen corresponding path program 1 times [2023-11-19 04:57:48,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:48,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858610801] [2023-11-19 04:57:48,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:48,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:48,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:48,515 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 04:57:48,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:48,518 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858610801] [2023-11-19 04:57:48,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858610801] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:48,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685180672] [2023-11-19 04:57:48,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:48,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:48,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:48,523 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:48,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:57:48,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:48,572 INFO L262 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 04:57:48,574 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:48,621 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:57:48,621 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:48,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:57:48,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685180672] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:48,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301544720] [2023-11-19 04:57:48,663 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:48,663 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:48,663 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:48,664 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:48,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:48,914 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:49,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '346#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:49,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:49,034 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:49,034 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2023-11-19 04:57:49,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161462230] [2023-11-19 04:57:49,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:49,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:57:49,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:49,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:57:49,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2023-11-19 04:57:49,040 INFO L87 Difference]: Start difference. First operand 19 states and 27 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 04:57:49,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:49,153 INFO L93 Difference]: Finished difference Result 51 states and 78 transitions. [2023-11-19 04:57:49,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 04:57:49,154 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 10 [2023-11-19 04:57:49,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:49,158 INFO L225 Difference]: With dead ends: 51 [2023-11-19 04:57:49,158 INFO L226 Difference]: Without dead ends: 47 [2023-11-19 04:57:49,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:57:49,162 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:49,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 11 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:49,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-19 04:57:49,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 41. [2023-11-19 04:57:49,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.55) internal successors, (62), 40 states have internal predecessors, (62), 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 04:57:49,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 62 transitions. [2023-11-19 04:57:49,197 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 62 transitions. Word has length 10 [2023-11-19 04:57:49,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:49,198 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 62 transitions. [2023-11-19 04:57:49,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 04:57:49,198 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 62 transitions. [2023-11-19 04:57:49,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:57:49,200 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:49,200 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:49,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:49,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:49,413 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:49,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:49,413 INFO L85 PathProgramCache]: Analyzing trace with hash 284392619, now seen corresponding path program 1 times [2023-11-19 04:57:49,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:49,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368048519] [2023-11-19 04:57:49,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:49,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:49,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:49,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:49,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:49,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368048519] [2023-11-19 04:57:49,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368048519] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:49,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189639274] [2023-11-19 04:57:49,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:49,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:49,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:49,846 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:49,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:57:49,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:49,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-19 04:57:49,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:50,017 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:50,017 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:50,209 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:50,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189639274] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:50,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020006057] [2023-11-19 04:57:50,219 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:50,219 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:50,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:50,220 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:50,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:50,394 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:50,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '600#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:50,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:50,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:50,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2023-11-19 04:57:50,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19105593] [2023-11-19 04:57:50,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:50,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 04:57:50,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:50,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 04:57:50,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:57:50,516 INFO L87 Difference]: Start difference. First operand 41 states and 62 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:51,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:51,248 INFO L93 Difference]: Finished difference Result 67 states and 94 transitions. [2023-11-19 04:57:51,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-19 04:57:51,249 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 04:57:51,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:51,250 INFO L225 Difference]: With dead ends: 67 [2023-11-19 04:57:51,250 INFO L226 Difference]: Without dead ends: 54 [2023-11-19 04:57:51,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=163, Invalid=649, Unknown=0, NotChecked=0, Total=812 [2023-11-19 04:57:51,252 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:51,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 15 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:57:51,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-19 04:57:51,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2023-11-19 04:57:51,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.5106382978723405) internal successors, (71), 47 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:51,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 71 transitions. [2023-11-19 04:57:51,298 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 71 transitions. Word has length 11 [2023-11-19 04:57:51,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:51,298 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 71 transitions. [2023-11-19 04:57:51,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:51,299 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 71 transitions. [2023-11-19 04:57:51,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:57:51,301 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:51,301 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:51,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:51,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:51,517 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:51,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:51,517 INFO L85 PathProgramCache]: Analyzing trace with hash -2077529955, now seen corresponding path program 2 times [2023-11-19 04:57:51,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:51,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741253721] [2023-11-19 04:57:51,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:51,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:51,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:51,617 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:51,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:51,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741253721] [2023-11-19 04:57:51,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741253721] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:51,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702664954] [2023-11-19 04:57:51,618 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:57:51,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:51,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:51,619 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:51,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:57:51,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 04:57:51,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:57:51,667 INFO L262 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 04:57:51,668 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:51,687 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:51,688 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:51,788 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:51,789 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702664954] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:51,789 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [65896944] [2023-11-19 04:57:51,791 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:51,791 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:51,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:51,792 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:51,792 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:51,872 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:52,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '918#(and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~z~0#1| 4294967296) 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:52,063 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:52,063 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:52,063 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-19 04:57:52,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351443889] [2023-11-19 04:57:52,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:52,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 04:57:52,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:52,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 04:57:52,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-19 04:57:52,065 INFO L87 Difference]: Start difference. First operand 48 states and 71 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:52,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:52,884 INFO L93 Difference]: Finished difference Result 196 states and 306 transitions. [2023-11-19 04:57:52,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-19 04:57:52,886 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 04:57:52,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:52,887 INFO L225 Difference]: With dead ends: 196 [2023-11-19 04:57:52,888 INFO L226 Difference]: Without dead ends: 183 [2023-11-19 04:57:52,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=342, Invalid=990, Unknown=0, NotChecked=0, Total=1332 [2023-11-19 04:57:52,889 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 272 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:52,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 75 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:57:52,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2023-11-19 04:57:52,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 74. [2023-11-19 04:57:52,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.5205479452054795) internal successors, (111), 73 states have internal predecessors, (111), 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 04:57:52,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 111 transitions. [2023-11-19 04:57:52,946 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 111 transitions. Word has length 11 [2023-11-19 04:57:52,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:52,947 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 111 transitions. [2023-11-19 04:57:52,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:52,947 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 111 transitions. [2023-11-19 04:57:52,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 04:57:52,949 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:52,949 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:52,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:53,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:53,169 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:53,170 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:53,170 INFO L85 PathProgramCache]: Analyzing trace with hash -2078069927, now seen corresponding path program 2 times [2023-11-19 04:57:53,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:53,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103178888] [2023-11-19 04:57:53,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:53,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:53,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:53,281 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:57:53,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:53,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103178888] [2023-11-19 04:57:53,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103178888] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:53,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854193666] [2023-11-19 04:57:53,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:57:53,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:53,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:53,286 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:53,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:57:53,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:57:53,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:57:53,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 04:57:53,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:53,374 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:57:53,374 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:53,451 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:57:53,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854193666] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:53,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [193822848] [2023-11-19 04:57:53,456 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:53,456 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:53,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:53,457 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:53,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:53,612 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:53,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1537#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:53,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:53,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:53,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 11 [2023-11-19 04:57:53,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003090874] [2023-11-19 04:57:53,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:53,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 04:57:53,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:53,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 04:57:53,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2023-11-19 04:57:53,703 INFO L87 Difference]: Start difference. First operand 74 states and 111 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:54,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:54,180 INFO L93 Difference]: Finished difference Result 151 states and 196 transitions. [2023-11-19 04:57:54,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-19 04:57:54,180 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 04:57:54,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:54,182 INFO L225 Difference]: With dead ends: 151 [2023-11-19 04:57:54,182 INFO L226 Difference]: Without dead ends: 127 [2023-11-19 04:57:54,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=733, Unknown=0, NotChecked=0, Total=870 [2023-11-19 04:57:54,183 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:54,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 88 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:57:54,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-11-19 04:57:54,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 69. [2023-11-19 04:57:54,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 68 states have internal predecessors, (100), 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 04:57:54,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 100 transitions. [2023-11-19 04:57:54,226 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 100 transitions. Word has length 13 [2023-11-19 04:57:54,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:54,226 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 100 transitions. [2023-11-19 04:57:54,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:57:54,226 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 100 transitions. [2023-11-19 04:57:54,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 04:57:54,227 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:54,228 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:54,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:54,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 04:57:54,448 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:54,448 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:54,448 INFO L85 PathProgramCache]: Analyzing trace with hash 2143263645, now seen corresponding path program 3 times [2023-11-19 04:57:54,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:54,449 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702847925] [2023-11-19 04:57:54,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:54,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:54,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:55,670 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:55,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:55,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702847925] [2023-11-19 04:57:55,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702847925] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:55,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460543927] [2023-11-19 04:57:55,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:57:55,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:55,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:55,672 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:55,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:57:55,733 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:57:55,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:57:55,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 34 conjunts are in the unsatisfiable core [2023-11-19 04:57:55,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:56,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:57:56,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:56,481 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:57:56,481 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460543927] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:56,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [197316278] [2023-11-19 04:57:56,484 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:56,484 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:56,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:56,484 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:56,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:56,613 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:56,778 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2086#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:56,778 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:56,778 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:56,778 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 8] total 27 [2023-11-19 04:57:56,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490315047] [2023-11-19 04:57:56,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:56,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-19 04:57:56,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:56,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-19 04:57:56,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=841, Unknown=0, NotChecked=0, Total=992 [2023-11-19 04:57:56,780 INFO L87 Difference]: Start difference. First operand 69 states and 100 transitions. Second operand has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 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 04:57:58,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:58,118 INFO L93 Difference]: Finished difference Result 120 states and 166 transitions. [2023-11-19 04:57:58,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-19 04:57:58,118 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-19 04:57:58,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:58,119 INFO L225 Difference]: With dead ends: 120 [2023-11-19 04:57:58,120 INFO L226 Difference]: Without dead ends: 105 [2023-11-19 04:57:58,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=296, Invalid=1596, Unknown=0, NotChecked=0, Total=1892 [2023-11-19 04:57:58,122 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 41 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:58,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 56 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:57:58,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-19 04:57:58,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 77. [2023-11-19 04:57:58,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.4078947368421053) internal successors, (107), 76 states have internal predecessors, (107), 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 04:57:58,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 107 transitions. [2023-11-19 04:57:58,189 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 107 transitions. Word has length 15 [2023-11-19 04:57:58,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:58,189 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 107 transitions. [2023-11-19 04:57:58,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 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 04:57:58,189 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 107 transitions. [2023-11-19 04:57:58,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 04:57:58,190 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:58,191 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:58,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-19 04:57:58,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:58,409 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:58,410 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:58,410 INFO L85 PathProgramCache]: Analyzing trace with hash -807330067, now seen corresponding path program 4 times [2023-11-19 04:57:58,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:58,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610669124] [2023-11-19 04:57:58,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:58,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:58,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:58,500 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:57:58,500 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:58,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610669124] [2023-11-19 04:57:58,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610669124] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:58,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980536504] [2023-11-19 04:57:58,501 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:57:58,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:58,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:58,502 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:58,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:57:58,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:58,552 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 04:57:58,554 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:58,629 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:57:58,629 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:58,726 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:57:58,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980536504] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:58,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806209984] [2023-11-19 04:57:58,729 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:58,729 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:58,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:58,730 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:58,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:57:58,889 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:57:58,984 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2585#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:57:58,985 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:57:58,985 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:57:58,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2023-11-19 04:57:58,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407226981] [2023-11-19 04:57:58,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:57:58,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 04:57:58,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:57:58,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 04:57:58,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2023-11-19 04:57:58,990 INFO L87 Difference]: Start difference. First operand 77 states and 107 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 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 04:57:59,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:57:59,381 INFO L93 Difference]: Finished difference Result 102 states and 140 transitions. [2023-11-19 04:57:59,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 04:57:59,383 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-19 04:57:59,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:57:59,384 INFO L225 Difference]: With dead ends: 102 [2023-11-19 04:57:59,384 INFO L226 Difference]: Without dead ends: 83 [2023-11-19 04:57:59,385 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 30 SyntacticMatches, 6 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:57:59,385 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 28 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:57:59,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 28 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:57:59,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-19 04:57:59,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 67. [2023-11-19 04:57:59,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.4242424242424243) internal successors, (94), 66 states have internal predecessors, (94), 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 04:57:59,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 94 transitions. [2023-11-19 04:57:59,452 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 94 transitions. Word has length 15 [2023-11-19 04:57:59,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:57:59,452 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 94 transitions. [2023-11-19 04:57:59,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 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 04:57:59,453 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 94 transitions. [2023-11-19 04:57:59,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 04:57:59,453 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:57:59,454 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:57:59,477 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:57:59,676 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:59,677 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:57:59,677 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:57:59,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1441860395, now seen corresponding path program 5 times [2023-11-19 04:57:59,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:57:59,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945935742] [2023-11-19 04:57:59,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:57:59,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:57:59,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:57:59,778 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 04:57:59,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:57:59,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945935742] [2023-11-19 04:57:59,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945935742] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:57:59,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088119362] [2023-11-19 04:57:59,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:57:59,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:57:59,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:57:59,781 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:57:59,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:57:59,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 04:57:59,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:57:59,838 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 04:57:59,839 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:57:59,874 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 04:57:59,874 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:57:59,955 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:57:59,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088119362] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:57:59,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1264232358] [2023-11-19 04:57:59,958 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:57:59,958 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:57:59,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:57:59,958 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:57:59,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:00,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:00,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3032#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:00,178 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:00,179 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:00,179 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 14 [2023-11-19 04:58:00,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967503770] [2023-11-19 04:58:00,179 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:00,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 04:58:00,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:00,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 04:58:00,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-19 04:58:00,180 INFO L87 Difference]: Start difference. First operand 67 states and 94 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:00,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:00,428 INFO L93 Difference]: Finished difference Result 107 states and 133 transitions. [2023-11-19 04:58:00,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 04:58:00,429 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-19 04:58:00,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:00,430 INFO L225 Difference]: With dead ends: 107 [2023-11-19 04:58:00,430 INFO L226 Difference]: Without dead ends: 95 [2023-11-19 04:58:00,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2023-11-19 04:58:00,431 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 30 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:00,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 66 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:58:00,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-19 04:58:00,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2023-11-19 04:58:00,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.4310344827586208) internal successors, (83), 58 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:00,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 83 transitions. [2023-11-19 04:58:00,482 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 83 transitions. Word has length 15 [2023-11-19 04:58:00,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:00,482 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 83 transitions. [2023-11-19 04:58:00,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:00,483 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 83 transitions. [2023-11-19 04:58:00,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-19 04:58:00,484 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:00,484 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:00,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:00,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:00,697 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:00,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:00,697 INFO L85 PathProgramCache]: Analyzing trace with hash 1135306713, now seen corresponding path program 2 times [2023-11-19 04:58:00,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:00,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308420768] [2023-11-19 04:58:00,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:00,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:00,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:00,820 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:00,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:00,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308420768] [2023-11-19 04:58:00,820 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308420768] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:00,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882262568] [2023-11-19 04:58:00,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:58:00,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:00,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:00,822 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:00,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 04:58:00,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 04:58:00,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:00,879 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-19 04:58:00,881 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:00,938 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:00,938 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:01,136 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:01,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882262568] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:01,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418506897] [2023-11-19 04:58:01,138 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:01,138 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:01,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:01,139 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:01,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:01,300 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:01,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3459#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:01,473 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:01,473 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:01,473 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 19 [2023-11-19 04:58:01,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826680677] [2023-11-19 04:58:01,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:01,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-19 04:58:01,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:01,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-19 04:58:01,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:58:01,476 INFO L87 Difference]: Start difference. First operand 59 states and 83 transitions. Second operand has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:04,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:04,137 INFO L93 Difference]: Finished difference Result 208 states and 258 transitions. [2023-11-19 04:58:04,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2023-11-19 04:58:04,137 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-19 04:58:04,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:04,138 INFO L225 Difference]: With dead ends: 208 [2023-11-19 04:58:04,139 INFO L226 Difference]: Without dead ends: 181 [2023-11-19 04:58:04,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1810 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=905, Invalid=5737, Unknown=0, NotChecked=0, Total=6642 [2023-11-19 04:58:04,143 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 257 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:04,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 122 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [122 Valid, 346 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 04:58:04,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2023-11-19 04:58:04,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 69. [2023-11-19 04:58:04,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.3529411764705883) internal successors, (92), 68 states have internal predecessors, (92), 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 04:58:04,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 92 transitions. [2023-11-19 04:58:04,217 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 92 transitions. Word has length 17 [2023-11-19 04:58:04,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:04,217 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 92 transitions. [2023-11-19 04:58:04,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.35) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:04,217 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 92 transitions. [2023-11-19 04:58:04,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 04:58:04,218 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:04,218 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:04,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-19 04:58:04,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-19 04:58:04,429 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:04,429 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:04,429 INFO L85 PathProgramCache]: Analyzing trace with hash 283782709, now seen corresponding path program 6 times [2023-11-19 04:58:04,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:04,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913162965] [2023-11-19 04:58:04,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:04,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:04,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:04,606 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 04:58:04,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:04,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913162965] [2023-11-19 04:58:04,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913162965] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:04,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109969297] [2023-11-19 04:58:04,607 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:58:04,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:04,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:04,609 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:04,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 04:58:04,667 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:58:04,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:04,668 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:58:04,669 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:04,700 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 04:58:04,700 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:04,758 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 04:58:04,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109969297] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:04,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [303121404] [2023-11-19 04:58:04,760 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:04,761 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:04,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:04,761 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:04,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:04,861 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:04,936 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4169#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:04,936 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:04,937 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:04,937 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2023-11-19 04:58:04,937 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357442064] [2023-11-19 04:58:04,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:04,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 04:58:04,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:04,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 04:58:04,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-11-19 04:58:04,939 INFO L87 Difference]: Start difference. First operand 69 states and 92 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:05,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:05,167 INFO L93 Difference]: Finished difference Result 84 states and 110 transitions. [2023-11-19 04:58:05,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 04:58:05,168 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-19 04:58:05,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:05,169 INFO L225 Difference]: With dead ends: 84 [2023-11-19 04:58:05,169 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 04:58:05,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:58:05,170 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 13 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:05,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 16 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:58:05,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 04:58:05,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2023-11-19 04:58:05,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.352112676056338) internal successors, (96), 71 states have internal predecessors, (96), 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 04:58:05,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 96 transitions. [2023-11-19 04:58:05,225 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 96 transitions. Word has length 18 [2023-11-19 04:58:05,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:05,225 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 96 transitions. [2023-11-19 04:58:05,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:05,225 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 96 transitions. [2023-11-19 04:58:05,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 04:58:05,226 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:05,226 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:05,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:05,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 04:58:05,426 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:05,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:05,427 INFO L85 PathProgramCache]: Analyzing trace with hash 206659563, now seen corresponding path program 7 times [2023-11-19 04:58:05,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:05,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834968421] [2023-11-19 04:58:05,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:05,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:05,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:06,048 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:58:06,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:06,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834968421] [2023-11-19 04:58:06,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834968421] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:06,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387811514] [2023-11-19 04:58:06,049 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:58:06,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:06,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:06,051 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:06,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 04:58:06,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:06,140 WARN L260 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-19 04:58:06,142 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:07,058 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:58:07,059 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:07,950 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:58:07,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387811514] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:07,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [966983750] [2023-11-19 04:58:07,952 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:07,952 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:07,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:07,953 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:07,953 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:08,051 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:08,309 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4624#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:08,310 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:08,310 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:08,310 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 11] total 33 [2023-11-19 04:58:08,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748685048] [2023-11-19 04:58:08,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:08,312 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-11-19 04:58:08,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:08,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-11-19 04:58:08,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1222, Unknown=0, NotChecked=0, Total=1406 [2023-11-19 04:58:08,315 INFO L87 Difference]: Start difference. First operand 72 states and 96 transitions. Second operand has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 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 04:58:11,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:11,145 INFO L93 Difference]: Finished difference Result 108 states and 144 transitions. [2023-11-19 04:58:11,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-11-19 04:58:11,146 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 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 19 [2023-11-19 04:58:11,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:11,147 INFO L225 Difference]: With dead ends: 108 [2023-11-19 04:58:11,147 INFO L226 Difference]: Without dead ends: 90 [2023-11-19 04:58:11,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=590, Invalid=3192, Unknown=0, NotChecked=0, Total=3782 [2023-11-19 04:58:11,149 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 65 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:11,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 23 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 04:58:11,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-19 04:58:11,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 77. [2023-11-19 04:58:11,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.394736842105263) internal successors, (106), 76 states have internal predecessors, (106), 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 04:58:11,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 106 transitions. [2023-11-19 04:58:11,238 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 106 transitions. Word has length 19 [2023-11-19 04:58:11,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:11,239 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 106 transitions. [2023-11-19 04:58:11,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.5) internal successors, (51), 33 states have internal predecessors, (51), 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 04:58:11,239 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 106 transitions. [2023-11-19 04:58:11,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 04:58:11,240 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:11,240 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:11,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:11,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:11,457 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:11,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:11,457 INFO L85 PathProgramCache]: Analyzing trace with hash 339294045, now seen corresponding path program 3 times [2023-11-19 04:58:11,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:11,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340832538] [2023-11-19 04:58:11,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:11,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:11,689 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:11,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:11,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340832538] [2023-11-19 04:58:11,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340832538] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:11,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792074996] [2023-11-19 04:58:11,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:58:11,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:11,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:11,691 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:11,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 04:58:11,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:58:11,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:11,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-19 04:58:11,736 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:11,838 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:11,838 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:11,890 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:11,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792074996] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:11,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [782476904] [2023-11-19 04:58:11,892 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:11,892 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:11,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:11,893 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:11,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:11,989 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:12,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5155#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:12,102 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:12,103 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:12,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 14 [2023-11-19 04:58:12,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399184859] [2023-11-19 04:58:12,103 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:12,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 04:58:12,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:12,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 04:58:12,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2023-11-19 04:58:12,104 INFO L87 Difference]: Start difference. First operand 77 states and 106 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 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 04:58:12,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:12,352 INFO L93 Difference]: Finished difference Result 113 states and 158 transitions. [2023-11-19 04:58:12,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 04:58:12,352 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 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 19 [2023-11-19 04:58:12,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:12,355 INFO L225 Difference]: With dead ends: 113 [2023-11-19 04:58:12,355 INFO L226 Difference]: Without dead ends: 110 [2023-11-19 04:58:12,356 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=81, Invalid=261, Unknown=0, NotChecked=0, Total=342 [2023-11-19 04:58:12,357 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 24 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:12,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 27 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:58:12,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-11-19 04:58:12,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 87. [2023-11-19 04:58:12,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.3837209302325582) internal successors, (119), 86 states have internal predecessors, (119), 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 04:58:12,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 119 transitions. [2023-11-19 04:58:12,471 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 119 transitions. Word has length 19 [2023-11-19 04:58:12,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:12,471 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 119 transitions. [2023-11-19 04:58:12,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 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 04:58:12,471 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 119 transitions. [2023-11-19 04:58:12,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 04:58:12,472 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:12,472 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:12,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:12,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-19 04:58:12,674 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:12,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:12,675 INFO L85 PathProgramCache]: Analyzing trace with hash 460496586, now seen corresponding path program 4 times [2023-11-19 04:58:12,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:12,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232866304] [2023-11-19 04:58:12,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:12,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:12,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:12,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:12,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232866304] [2023-11-19 04:58:12,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232866304] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:12,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [944091458] [2023-11-19 04:58:12,800 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:58:12,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:12,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:12,801 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:12,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-19 04:58:12,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:12,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 04:58:12,853 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:12,910 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 04:58:12,911 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:13,047 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 04:58:13,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [944091458] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:13,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [417417118] [2023-11-19 04:58:13,049 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:13,049 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:13,050 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:13,050 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:13,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:13,147 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:13,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5675#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:13,269 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:13,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:13,270 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 18 [2023-11-19 04:58:13,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754833382] [2023-11-19 04:58:13,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:13,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 04:58:13,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:13,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 04:58:13,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:58:13,271 INFO L87 Difference]: Start difference. First operand 87 states and 119 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 18 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:13,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:13,665 INFO L93 Difference]: Finished difference Result 166 states and 213 transitions. [2023-11-19 04:58:13,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-19 04:58:13,666 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 18 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-19 04:58:13,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:13,667 INFO L225 Difference]: With dead ends: 166 [2023-11-19 04:58:13,667 INFO L226 Difference]: Without dead ends: 153 [2023-11-19 04:58:13,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:58:13,669 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 65 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:13,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 96 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:58:13,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2023-11-19 04:58:13,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 100. [2023-11-19 04:58:13,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 99 states have (on average 1.3232323232323233) internal successors, (131), 99 states have internal predecessors, (131), 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 04:58:13,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 131 transitions. [2023-11-19 04:58:13,811 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 131 transitions. Word has length 19 [2023-11-19 04:58:13,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:13,812 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 131 transitions. [2023-11-19 04:58:13,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 18 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:13,812 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 131 transitions. [2023-11-19 04:58:13,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 04:58:13,813 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:13,813 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:13,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:14,028 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-19 04:58:14,029 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:14,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:14,029 INFO L85 PathProgramCache]: Analyzing trace with hash -788455885, now seen corresponding path program 5 times [2023-11-19 04:58:14,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:14,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782622942] [2023-11-19 04:58:14,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:14,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:14,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:14,179 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:14,179 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:14,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782622942] [2023-11-19 04:58:14,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782622942] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:14,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497493288] [2023-11-19 04:58:14,180 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:58:14,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:14,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:14,181 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:14,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-19 04:58:14,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 04:58:14,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:14,240 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 04:58:14,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:14,340 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:14,340 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:14,586 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:14,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497493288] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:14,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196246087] [2023-11-19 04:58:14,588 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:14,588 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:14,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:14,588 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:14,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:14,674 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:14,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6320#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:14,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:14,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:14,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12] total 27 [2023-11-19 04:58:14,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423307427] [2023-11-19 04:58:14,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:14,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-19 04:58:14,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:14,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-19 04:58:14,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2023-11-19 04:58:14,820 INFO L87 Difference]: Start difference. First operand 100 states and 131 transitions. Second operand has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:15,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:15,867 INFO L93 Difference]: Finished difference Result 210 states and 263 transitions. [2023-11-19 04:58:15,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-11-19 04:58:15,868 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-19 04:58:15,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:15,869 INFO L225 Difference]: With dead ends: 210 [2023-11-19 04:58:15,869 INFO L226 Difference]: Without dead ends: 190 [2023-11-19 04:58:15,871 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=551, Invalid=2311, Unknown=0, NotChecked=0, Total=2862 [2023-11-19 04:58:15,872 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 107 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:15,872 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 96 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:58:15,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2023-11-19 04:58:15,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 118. [2023-11-19 04:58:15,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.3076923076923077) internal successors, (153), 117 states have internal predecessors, (153), 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 04:58:15,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 153 transitions. [2023-11-19 04:58:15,978 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 153 transitions. Word has length 20 [2023-11-19 04:58:15,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:15,979 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 153 transitions. [2023-11-19 04:58:15,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 27 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:15,979 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 153 transitions. [2023-11-19 04:58:15,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 04:58:15,980 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:15,980 INFO L195 NwaCegarLoop]: trace histogram [10, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:16,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:16,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-19 04:58:16,197 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:16,197 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:16,197 INFO L85 PathProgramCache]: Analyzing trace with hash -742194334, now seen corresponding path program 1 times [2023-11-19 04:58:16,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:16,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432155517] [2023-11-19 04:58:16,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:16,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:16,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:16,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:16,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432155517] [2023-11-19 04:58:16,399 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432155517] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:16,399 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227645406] [2023-11-19 04:58:16,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:16,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:16,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:16,401 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:16,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-19 04:58:16,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:16,462 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-19 04:58:16,463 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:16,509 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:16,509 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:16,551 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-19 04:58:16,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227645406] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:16,551 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 04:58:16,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13, 13] total 17 [2023-11-19 04:58:16,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165906806] [2023-11-19 04:58:16,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:58:16,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 04:58:16,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:16,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 04:58:16,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:58:16,553 INFO L87 Difference]: Start difference. First operand 118 states and 153 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 04:58:16,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:16,725 INFO L93 Difference]: Finished difference Result 126 states and 160 transitions. [2023-11-19 04:58:16,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 04:58:16,726 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 20 [2023-11-19 04:58:16,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:16,727 INFO L225 Difference]: With dead ends: 126 [2023-11-19 04:58:16,727 INFO L226 Difference]: Without dead ends: 116 [2023-11-19 04:58:16,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2023-11-19 04:58:16,729 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:16,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 7 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:58:16,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-11-19 04:58:16,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2023-11-19 04:58:16,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.3) internal successors, (143), 110 states have internal predecessors, (143), 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 04:58:16,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 143 transitions. [2023-11-19 04:58:16,886 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 143 transitions. Word has length 20 [2023-11-19 04:58:16,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:16,886 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 143 transitions. [2023-11-19 04:58:16,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 04:58:16,886 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 143 transitions. [2023-11-19 04:58:16,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 04:58:16,890 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:16,890 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:16,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:17,110 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-19 04:58:17,110 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:17,111 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:17,111 INFO L85 PathProgramCache]: Analyzing trace with hash 173438325, now seen corresponding path program 6 times [2023-11-19 04:58:17,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:17,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1405910623] [2023-11-19 04:58:17,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:17,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:17,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:17,407 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:17,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:17,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1405910623] [2023-11-19 04:58:17,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1405910623] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:17,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609507606] [2023-11-19 04:58:17,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:58:17,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:17,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:17,409 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:17,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-11-19 04:58:17,464 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:58:17,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:17,466 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 04:58:17,467 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:17,592 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:17,592 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:17,657 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:17,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609507606] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:17,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1585482650] [2023-11-19 04:58:17,660 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:17,661 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:17,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:17,661 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:17,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:17,763 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:17,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7719#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:17,897 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:17,897 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:17,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8] total 17 [2023-11-19 04:58:17,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897317743] [2023-11-19 04:58:17,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:17,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 04:58:17,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:17,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 04:58:17,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2023-11-19 04:58:17,898 INFO L87 Difference]: Start difference. First operand 111 states and 143 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:18,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:18,311 INFO L93 Difference]: Finished difference Result 147 states and 193 transitions. [2023-11-19 04:58:18,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:58:18,312 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-19 04:58:18,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:18,313 INFO L225 Difference]: With dead ends: 147 [2023-11-19 04:58:18,313 INFO L226 Difference]: Without dead ends: 144 [2023-11-19 04:58:18,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2023-11-19 04:58:18,315 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 28 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:18,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 41 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:58:18,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2023-11-19 04:58:18,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 131. [2023-11-19 04:58:18,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.2923076923076924) internal successors, (168), 130 states have internal predecessors, (168), 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 04:58:18,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 168 transitions. [2023-11-19 04:58:18,451 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 168 transitions. Word has length 22 [2023-11-19 04:58:18,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:18,451 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 168 transitions. [2023-11-19 04:58:18,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:18,452 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 168 transitions. [2023-11-19 04:58:18,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 04:58:18,452 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:18,453 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:18,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:18,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-19 04:58:18,669 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:18,669 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:18,669 INFO L85 PathProgramCache]: Analyzing trace with hash -959162942, now seen corresponding path program 8 times [2023-11-19 04:58:18,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:18,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979344272] [2023-11-19 04:58:18,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:18,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:18,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:18,843 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 04:58:18,843 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:18,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979344272] [2023-11-19 04:58:18,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979344272] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:18,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412259834] [2023-11-19 04:58:18,844 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:58:18,844 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:18,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:18,846 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:18,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-11-19 04:58:18,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-19 04:58:18,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:18,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-19 04:58:18,940 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:19,001 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-19 04:58:19,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:19,136 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-19 04:58:19,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [412259834] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:19,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901461078] [2023-11-19 04:58:19,138 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:19,138 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:19,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:19,138 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:19,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:19,248 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:19,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8416#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:19,383 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:19,383 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:19,383 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 8] total 21 [2023-11-19 04:58:19,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913978401] [2023-11-19 04:58:19,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:19,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-19 04:58:19,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:19,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-19 04:58:19,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2023-11-19 04:58:19,385 INFO L87 Difference]: Start difference. First operand 131 states and 168 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 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 04:58:20,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:20,382 INFO L93 Difference]: Finished difference Result 216 states and 259 transitions. [2023-11-19 04:58:20,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2023-11-19 04:58:20,383 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-19 04:58:20,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:20,384 INFO L225 Difference]: With dead ends: 216 [2023-11-19 04:58:20,384 INFO L226 Difference]: Without dead ends: 187 [2023-11-19 04:58:20,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=247, Invalid=1645, Unknown=0, NotChecked=0, Total=1892 [2023-11-19 04:58:20,386 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 58 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:20,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 184 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 04:58:20,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2023-11-19 04:58:20,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 122. [2023-11-19 04:58:20,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.2644628099173554) internal successors, (153), 121 states have internal predecessors, (153), 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 04:58:20,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 153 transitions. [2023-11-19 04:58:20,523 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 153 transitions. Word has length 22 [2023-11-19 04:58:20,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:20,523 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 153 transitions. [2023-11-19 04:58:20,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 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 04:58:20,523 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 153 transitions. [2023-11-19 04:58:20,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:58:20,524 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:20,524 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:20,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-11-19 04:58:20,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:20,725 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:20,725 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:20,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1898307363, now seen corresponding path program 9 times [2023-11-19 04:58:20,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:20,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012642040] [2023-11-19 04:58:20,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:20,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:20,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:21,454 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 04:58:21,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:21,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012642040] [2023-11-19 04:58:21,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012642040] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:21,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1591841652] [2023-11-19 04:58:21,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:58:21,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:21,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:21,461 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:21,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-11-19 04:58:21,632 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:58:21,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:58:21,634 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 55 conjunts are in the unsatisfiable core [2023-11-19 04:58:21,636 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:22,987 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:58:22,987 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:23,746 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:58:23,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1591841652] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:23,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818166037] [2023-11-19 04:58:23,747 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:23,748 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:23,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:23,748 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:23,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:23,867 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:24,085 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9265#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:24,085 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:24,085 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:24,086 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 12] total 39 [2023-11-19 04:58:24,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518506137] [2023-11-19 04:58:24,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:24,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-11-19 04:58:24,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:24,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-11-19 04:58:24,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=1643, Unknown=0, NotChecked=0, Total=1892 [2023-11-19 04:58:24,088 INFO L87 Difference]: Start difference. First operand 122 states and 153 transitions. Second operand has 40 states, 40 states have (on average 1.475) internal successors, (59), 39 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:27,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:58:27,649 INFO L93 Difference]: Finished difference Result 194 states and 234 transitions. [2023-11-19 04:58:27,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-11-19 04:58:27,649 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.475) internal successors, (59), 39 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-19 04:58:27,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:58:27,651 INFO L225 Difference]: With dead ends: 194 [2023-11-19 04:58:27,651 INFO L226 Difference]: Without dead ends: 173 [2023-11-19 04:58:27,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1178 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=590, Invalid=4102, Unknown=0, NotChecked=0, Total=4692 [2023-11-19 04:58:27,655 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 37 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 723 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 723 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 04:58:27,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 108 Invalid, 769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 723 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 04:58:27,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2023-11-19 04:58:27,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 128. [2023-11-19 04:58:27,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.2992125984251968) internal successors, (165), 127 states have internal predecessors, (165), 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 04:58:27,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 165 transitions. [2023-11-19 04:58:27,843 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 165 transitions. Word has length 23 [2023-11-19 04:58:27,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:58:27,843 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 165 transitions. [2023-11-19 04:58:27,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.475) internal successors, (59), 39 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:58:27,844 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 165 transitions. [2023-11-19 04:58:27,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 04:58:27,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:58:27,844 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:58:27,856 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-11-19 04:58:28,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2023-11-19 04:58:28,051 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:58:28,051 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:58:28,051 INFO L85 PathProgramCache]: Analyzing trace with hash -480959975, now seen corresponding path program 7 times [2023-11-19 04:58:28,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:58:28,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88763820] [2023-11-19 04:58:28,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:58:28,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:58:28,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:28,277 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:28,278 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:58:28,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88763820] [2023-11-19 04:58:28,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88763820] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:58:28,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443508565] [2023-11-19 04:58:28,279 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:58:28,279 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:58:28,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:58:28,280 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:58:28,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_db49530d-481f-4b0b-bef1-9c33d6160bc5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-11-19 04:58:28,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:58:28,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 04:58:28,348 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:58:28,410 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:28,410 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:58:28,813 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 04:58:28,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443508565] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:58:28,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351925787] [2023-11-19 04:58:28,815 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 04:58:28,815 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:58:28,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:58:28,816 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:58:28,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:58:28,918 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:58:29,131 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10101#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) (mod |ULTIMATE.start_main_~n~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 04:58:29,131 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:58:29,131 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:58:29,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 27 [2023-11-19 04:58:29,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568020058] [2023-11-19 04:58:29,132 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:58:29,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-19 04:58:29,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:58:29,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-19 04:58:29,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=894, Unknown=0, NotChecked=0, Total=1056 [2023-11-19 04:58:29,134 INFO L87 Difference]: Start difference. First operand 128 states and 165 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 27 states have internal predecessors, (35), 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)