./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de31.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de31.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX --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 28f1f7a35f3c64149ac63836a12126d2f43ea1d4c4384507ba9d3ae156113818 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:53:39,161 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:53:39,282 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:53:39,289 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:53:39,290 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:53:39,331 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:53:39,332 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:53:39,332 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:53:39,333 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:53:39,338 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:53:39,338 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:53:39,339 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:53:39,339 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:53:39,341 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:53:39,341 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:53:39,342 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:53:39,342 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:53:39,342 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:53:39,343 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:53:39,343 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:53:39,344 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:53:39,344 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:53:39,345 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:53:39,346 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:53:39,346 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:53:39,347 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:53:39,347 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:53:39,348 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:53:39,348 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:53:39,348 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:53:39,350 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:53:39,350 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:53:39,350 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:53:39,350 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:53:39,351 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:53:39,351 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:53:39,351 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:53:39,352 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:53:39,352 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:53:39,352 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:53:39,352 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:53:39,353 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:53:39,353 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:53:39,353 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:53:39,354 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:53:39,354 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_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 28f1f7a35f3c64149ac63836a12126d2f43ea1d4c4384507ba9d3ae156113818 [2023-11-12 00:53:39,662 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:53:39,696 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:53:39,698 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:53:39,701 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:53:39,703 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:53:39,705 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/loops-crafted-1/in-de31.c [2023-11-12 00:53:42,908 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:53:43,147 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:53:43,148 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/sv-benchmarks/c/loops-crafted-1/in-de31.c [2023-11-12 00:53:43,156 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/data/ab6fa87fc/f7cec70e54b04baa93e91a40bedb1d3f/FLAG1d9b2c903 [2023-11-12 00:53:43,176 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/data/ab6fa87fc/f7cec70e54b04baa93e91a40bedb1d3f [2023-11-12 00:53:43,182 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:53:43,184 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:53:43,188 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:53:43,188 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:53:43,194 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:53:43,195 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,196 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bdac279 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43, skipping insertion in model container [2023-11-12 00:53:43,196 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,220 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:53:43,413 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_02d96818-c693-4807-85c9-c9263db63390/sv-benchmarks/c/loops-crafted-1/in-de31.c[368,381] [2023-11-12 00:53:43,433 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:53:43,445 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:53:43,459 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_02d96818-c693-4807-85c9-c9263db63390/sv-benchmarks/c/loops-crafted-1/in-de31.c[368,381] [2023-11-12 00:53:43,467 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:53:43,484 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:53:43,484 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43 WrapperNode [2023-11-12 00:53:43,484 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:53:43,486 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:53:43,486 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:53:43,486 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:53:43,494 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,503 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,526 INFO L138 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2023-11-12 00:53:43,527 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:53:43,528 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:53:43,529 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:53:43,529 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:53:43,539 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,539 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,542 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,542 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,558 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,562 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,564 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,565 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,572 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:53:43,573 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:53:43,574 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:53:43,574 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:53:43,575 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (1/1) ... [2023-11-12 00:53:43,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:53:43,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:43,617 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:53:43,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:53:43,664 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:53:43,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:53:43,665 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:53:43,665 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:53:43,746 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:53:43,748 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:53:43,968 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:53:44,006 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:53:44,006 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:53:44,009 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:53:44 BoogieIcfgContainer [2023-11-12 00:53:44,009 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:53:44,012 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:53:44,012 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:53:44,015 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:53:44,016 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:53:43" (1/3) ... [2023-11-12 00:53:44,017 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39bc51da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:53:44, skipping insertion in model container [2023-11-12 00:53:44,017 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:53:43" (2/3) ... [2023-11-12 00:53:44,017 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39bc51da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:53:44, skipping insertion in model container [2023-11-12 00:53:44,018 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:53:44" (3/3) ... [2023-11-12 00:53:44,019 INFO L112 eAbstractionObserver]: Analyzing ICFG in-de31.c [2023-11-12 00:53:44,040 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:53:44,041 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:53:44,105 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:53:44,114 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;@3b86e514, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:53:44,116 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:53:44,120 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) 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) [2023-11-12 00:53:44,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:53:44,128 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:44,129 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:53:44,130 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:44,137 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:44,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1774769397, now seen corresponding path program 1 times [2023-11-12 00:53:44,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:44,148 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244266049] [2023-11-12 00:53:44,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:44,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:44,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:44,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:44,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:44,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244266049] [2023-11-12 00:53:44,840 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244266049] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:53:44,841 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:53:44,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:53:44,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395298704] [2023-11-12 00:53:44,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:53:44,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:53:44,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:44,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:53:44,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:53:44,895 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) 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) Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 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) [2023-11-12 00:53:45,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:45,036 INFO L93 Difference]: Finished difference Result 21 states and 30 transitions. [2023-11-12 00:53:45,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:53:45,041 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 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 6 [2023-11-12 00:53:45,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:45,047 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:53:45,047 INFO L226 Difference]: Without dead ends: 8 [2023-11-12 00:53:45,050 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:53:45,054 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 7 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:45,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:53:45,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-12 00:53:45,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-12 00:53:45,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 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) [2023-11-12 00:53:45,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2023-11-12 00:53:45,088 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2023-11-12 00:53:45,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:45,089 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2023-11-12 00:53:45,089 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 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) [2023-11-12 00:53:45,089 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2023-11-12 00:53:45,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:53:45,090 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:45,090 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:45,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:53:45,091 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:45,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:45,092 INFO L85 PathProgramCache]: Analyzing trace with hash -611083188, now seen corresponding path program 1 times [2023-11-12 00:53:45,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:45,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055807393] [2023-11-12 00:53:45,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:45,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:45,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:45,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:45,239 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:45,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055807393] [2023-11-12 00:53:45,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055807393] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:45,240 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310064997] [2023-11-12 00:53:45,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:45,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:45,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:45,244 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:45,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:53:45,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:45,298 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:53:45,302 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:45,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:45,334 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:45,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:45,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310064997] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:45,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [566001693] [2023-11-12 00:53:45,420 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:45,420 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:45,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:45,429 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:45,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:45,643 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:45,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107#(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_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:45,857 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:45,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:45,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-12 00:53:45,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310870] [2023-11-12 00:53:45,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:45,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:53:45,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:45,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:53:45,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:53:45,866 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:46,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:46,050 INFO L93 Difference]: Finished difference Result 29 states and 44 transitions. [2023-11-12 00:53:46,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:53:46,051 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:53:46,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:46,053 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:53:46,053 INFO L226 Difference]: Without dead ends: 25 [2023-11-12 00:53:46,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:53:46,057 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 24 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:46,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:53:46,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-12 00:53:46,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2023-11-12 00:53:46,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:46,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 25 transitions. [2023-11-12 00:53:46,073 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 25 transitions. Word has length 7 [2023-11-12 00:53:46,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:46,073 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 25 transitions. [2023-11-12 00:53:46,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:46,074 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 25 transitions. [2023-11-12 00:53:46,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:53:46,076 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:46,077 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:46,083 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:53:46,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:46,283 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:46,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:46,284 INFO L85 PathProgramCache]: Analyzing trace with hash 212774083, now seen corresponding path program 1 times [2023-11-12 00:53:46,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:46,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756323641] [2023-11-12 00:53:46,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:46,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:46,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:46,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:46,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:46,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756323641] [2023-11-12 00:53:46,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756323641] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:46,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122725086] [2023-11-12 00:53:46,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:46,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:46,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:46,779 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:46,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:53:46,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:46,836 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-12 00:53:46,837 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:47,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:47,031 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:47,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:47,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122725086] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:47,271 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440517681] [2023-11-12 00:53:47,274 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:47,274 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:47,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:47,275 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:47,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:47,476 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:47,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '264#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:47,644 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:47,644 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:47,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 15 [2023-11-12 00:53:47,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63619565] [2023-11-12 00:53:47,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:47,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-12 00:53:47,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:47,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-12 00:53:47,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:53:47,646 INFO L87 Difference]: Start difference. First operand 18 states and 25 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 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) [2023-11-12 00:53:48,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:48,795 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2023-11-12 00:53:48,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:53:48,796 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:53:48,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:48,797 INFO L225 Difference]: With dead ends: 39 [2023-11-12 00:53:48,797 INFO L226 Difference]: Without dead ends: 27 [2023-11-12 00:53:48,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=160, Invalid=770, Unknown=0, NotChecked=0, Total=930 [2023-11-12 00:53:48,799 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 32 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:48,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:53:48,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-12 00:53:48,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 16. [2023-11-12 00:53:48,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 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) [2023-11-12 00:53:48,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2023-11-12 00:53:48,812 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 22 transitions. Word has length 9 [2023-11-12 00:53:48,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:48,812 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 22 transitions. [2023-11-12 00:53:48,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 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) [2023-11-12 00:53:48,813 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 22 transitions. [2023-11-12 00:53:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:53:48,814 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:48,814 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:48,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:53:49,020 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:49,020 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:49,020 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:49,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1114239819, now seen corresponding path program 2 times [2023-11-12 00:53:49,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:49,021 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41465747] [2023-11-12 00:53:49,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:49,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:49,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:49,172 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:49,172 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:49,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41465747] [2023-11-12 00:53:49,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41465747] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:49,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231856199] [2023-11-12 00:53:49,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:53:49,173 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:49,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:49,175 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:49,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:53:49,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:53:49,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:53:49,234 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:53:49,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:49,260 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:49,260 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:49,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231856199] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:49,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1347039835] [2023-11-12 00:53:49,382 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:49,382 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:49,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:49,383 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:49,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:49,500 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:49,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '450#(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_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:49,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:49,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:49,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-12 00:53:49,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065059999] [2023-11-12 00:53:49,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:49,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:53:49,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:49,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:53:49,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:53:49,697 INFO L87 Difference]: Start difference. First operand 16 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:50,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:50,782 INFO L93 Difference]: Finished difference Result 62 states and 102 transitions. [2023-11-12 00:53:50,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-12 00:53:50,783 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:53:50,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:50,784 INFO L225 Difference]: With dead ends: 62 [2023-11-12 00:53:50,784 INFO L226 Difference]: Without dead ends: 58 [2023-11-12 00:53:50,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=321, Invalid=939, Unknown=0, NotChecked=0, Total=1260 [2023-11-12 00:53:50,786 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 114 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:50,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 11 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:53:50,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-12 00:53:50,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 32. [2023-11-12 00:53:50,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 states have internal predecessors, (46), 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) [2023-11-12 00:53:50,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 46 transitions. [2023-11-12 00:53:50,810 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 46 transitions. Word has length 10 [2023-11-12 00:53:50,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:50,811 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 46 transitions. [2023-11-12 00:53:50,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:50,811 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 46 transitions. [2023-11-12 00:53:50,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:53:50,814 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:50,814 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:50,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:53:51,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:51,033 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:51,033 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:51,033 INFO L85 PathProgramCache]: Analyzing trace with hash -60019915, now seen corresponding path program 2 times [2023-11-12 00:53:51,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:51,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561395369] [2023-11-12 00:53:51,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:51,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:51,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:51,117 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:53:51,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:51,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561395369] [2023-11-12 00:53:51,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561395369] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:51,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366894061] [2023-11-12 00:53:51,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:53:51,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:51,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:51,120 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:51,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:53:51,171 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:53:51,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:53:51,172 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:53:51,174 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:51,214 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:53:51,214 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:51,294 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:53:51,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366894061] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:51,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1036566210] [2023-11-12 00:53:51,296 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:51,297 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:51,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:51,297 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:51,297 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:51,429 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:51,523 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '734#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:51,523 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:51,523 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:51,523 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2023-11-12 00:53:51,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850030146] [2023-11-12 00:53:51,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:51,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:53:51,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:51,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:53:51,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-12 00:53:51,525 INFO L87 Difference]: Start difference. First operand 32 states and 46 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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) [2023-11-12 00:53:51,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:51,709 INFO L93 Difference]: Finished difference Result 62 states and 84 transitions. [2023-11-12 00:53:51,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:53:51,710 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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 [2023-11-12 00:53:51,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:51,711 INFO L225 Difference]: With dead ends: 62 [2023-11-12 00:53:51,711 INFO L226 Difference]: Without dead ends: 53 [2023-11-12 00:53:51,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2023-11-12 00:53:51,713 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 19 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:51,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 26 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:53:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-12 00:53:51,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2023-11-12 00:53:51,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 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) [2023-11-12 00:53:51,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 57 transitions. [2023-11-12 00:53:51,741 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 57 transitions. Word has length 11 [2023-11-12 00:53:51,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:51,741 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 57 transitions. [2023-11-12 00:53:51,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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) [2023-11-12 00:53:51,742 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 57 transitions. [2023-11-12 00:53:51,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:53:51,743 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:51,743 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:51,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:53:51,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:51,949 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:51,950 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:51,950 INFO L85 PathProgramCache]: Analyzing trace with hash -454325109, now seen corresponding path program 3 times [2023-11-12 00:53:51,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:51,950 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113500776] [2023-11-12 00:53:51,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:51,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:52,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:52,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:52,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113500776] [2023-11-12 00:53:52,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113500776] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:52,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322844602] [2023-11-12 00:53:52,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:53:52,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:52,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:52,513 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:52,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:53:52,579 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:53:52,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:53:52,581 WARN L260 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 36 conjunts are in the unsatisfiable core [2023-11-12 00:53:52,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:52,929 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:52,930 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:54,622 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:54,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322844602] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:54,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1035472007] [2023-11-12 00:53:54,625 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:54,625 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:54,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:54,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:54,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:54,734 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:54,899 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1019#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:54,899 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:54,899 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:54,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 9] total 23 [2023-11-12 00:53:54,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065134058] [2023-11-12 00:53:54,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:54,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 00:53:54,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:54,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 00:53:54,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2023-11-12 00:53:54,902 INFO L87 Difference]: Start difference. First operand 39 states and 57 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:58,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:58,088 INFO L93 Difference]: Finished difference Result 79 states and 101 transitions. [2023-11-12 00:53:58,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-11-12 00:53:58,088 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:53:58,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:58,089 INFO L225 Difference]: With dead ends: 79 [2023-11-12 00:53:58,089 INFO L226 Difference]: Without dead ends: 61 [2023-11-12 00:53:58,090 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=238, Invalid=1568, Unknown=0, NotChecked=0, Total=1806 [2023-11-12 00:53:58,091 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 40 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:58,091 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 38 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-12 00:53:58,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-12 00:53:58,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 39. [2023-11-12 00:53:58,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.4736842105263157) internal successors, (56), 38 states have internal predecessors, (56), 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) [2023-11-12 00:53:58,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 56 transitions. [2023-11-12 00:53:58,123 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 56 transitions. Word has length 12 [2023-11-12 00:53:58,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:58,123 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 56 transitions. [2023-11-12 00:53:58,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:53:58,124 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 56 transitions. [2023-11-12 00:53:58,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:53:58,125 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:58,125 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:58,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:53:58,335 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:58,336 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:58,336 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:58,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1692990645, now seen corresponding path program 4 times [2023-11-12 00:53:58,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:58,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481879124] [2023-11-12 00:53:58,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:58,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:58,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:58,593 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:53:58,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:58,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481879124] [2023-11-12 00:53:58,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481879124] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:58,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024876585] [2023-11-12 00:53:58,594 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:53:58,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:58,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:58,598 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:58,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:53:58,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:58,659 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-12 00:53:58,660 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:58,729 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:53:58,729 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:53:58,831 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:53:58,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024876585] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:53:58,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33190508] [2023-11-12 00:53:58,834 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:53:58,835 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:53:58,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:53:58,836 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:53:58,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:53:58,977 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:53:59,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1362#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:53:59,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:53:59,084 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:53:59,085 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 6] total 17 [2023-11-12 00:53:59,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418573726] [2023-11-12 00:53:59,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:53:59,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-12 00:53:59,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:53:59,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-12 00:53:59,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:53:59,087 INFO L87 Difference]: Start difference. First operand 39 states and 56 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 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) [2023-11-12 00:53:59,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:53:59,434 INFO L93 Difference]: Finished difference Result 70 states and 98 transitions. [2023-11-12 00:53:59,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-12 00:53:59,435 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 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 14 [2023-11-12 00:53:59,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:53:59,436 INFO L225 Difference]: With dead ends: 70 [2023-11-12 00:53:59,436 INFO L226 Difference]: Without dead ends: 61 [2023-11-12 00:53:59,437 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2023-11-12 00:53:59,438 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 38 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:53:59,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 23 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:53:59,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-12 00:53:59,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2023-11-12 00:53:59,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 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) [2023-11-12 00:53:59,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2023-11-12 00:53:59,480 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 14 [2023-11-12 00:53:59,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:53:59,481 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2023-11-12 00:53:59,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 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) [2023-11-12 00:53:59,481 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2023-11-12 00:53:59,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:53:59,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:53:59,482 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:53:59,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:53:59,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:53:59,689 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:53:59,689 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:53:59,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1197854901, now seen corresponding path program 5 times [2023-11-12 00:53:59,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:53:59,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230609351] [2023-11-12 00:53:59,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:53:59,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:53:59,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:53:59,799 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:53:59,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:53:59,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230609351] [2023-11-12 00:53:59,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230609351] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:53:59,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011747377] [2023-11-12 00:53:59,800 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:53:59,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:53:59,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:53:59,803 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:53:59,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:53:59,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:53:59,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:53:59,866 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-12 00:53:59,868 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:53:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:53:59,928 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:54:00,058 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:54:00,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011747377] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:54:00,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [217188590] [2023-11-12 00:54:00,061 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:54:00,061 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:54:00,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:54:00,062 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:54:00,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:54:00,183 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:54:00,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1693#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:54:00,300 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:54:00,301 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:54:00,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 18 [2023-11-12 00:54:00,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826327073] [2023-11-12 00:54:00,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:54:00,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 00:54:00,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:54:00,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 00:54:00,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2023-11-12 00:54:00,303 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:00,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:54:00,714 INFO L93 Difference]: Finished difference Result 83 states and 108 transitions. [2023-11-12 00:54:00,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:54:00,714 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 00:54:00,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:54:00,715 INFO L225 Difference]: With dead ends: 83 [2023-11-12 00:54:00,715 INFO L226 Difference]: Without dead ends: 69 [2023-11-12 00:54:00,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2023-11-12 00:54:00,717 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:54:00,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 34 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:54:00,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-12 00:54:00,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 53. [2023-11-12 00:54:00,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 52 states have internal predecessors, (73), 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) [2023-11-12 00:54:00,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 73 transitions. [2023-11-12 00:54:00,768 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 73 transitions. Word has length 14 [2023-11-12 00:54:00,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:54:00,768 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 73 transitions. [2023-11-12 00:54:00,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:00,769 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 73 transitions. [2023-11-12 00:54:00,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:54:00,770 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:54:00,770 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1] [2023-11-12 00:54:00,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:54:00,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:00,977 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:54:00,979 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:54:00,979 INFO L85 PathProgramCache]: Analyzing trace with hash -2107416637, now seen corresponding path program 6 times [2023-11-12 00:54:00,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:54:00,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391357012] [2023-11-12 00:54:00,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:54:00,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:54:01,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:54:01,749 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:01,749 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:54:01,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391357012] [2023-11-12 00:54:01,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391357012] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:54:01,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332585822] [2023-11-12 00:54:01,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:54:01,750 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:01,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:54:01,751 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:54:01,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:54:01,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:54:01,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:54:01,841 WARN L260 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-12 00:54:01,843 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:54:02,704 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:02,704 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:54:03,425 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:03,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332585822] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:54:03,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647596648] [2023-11-12 00:54:03,427 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:54:03,427 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:54:03,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:54:03,428 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:54:03,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:54:03,554 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:54:03,734 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2077#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:54:03,734 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:54:03,734 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:54:03,735 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 13, 11] total 30 [2023-11-12 00:54:03,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538687584] [2023-11-12 00:54:03,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:54:03,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-12 00:54:03,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:54:03,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-12 00:54:03,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:54:03,737 INFO L87 Difference]: Start difference. First operand 53 states and 73 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:08,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:54:08,084 INFO L93 Difference]: Finished difference Result 98 states and 121 transitions. [2023-11-12 00:54:08,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-11-12 00:54:08,085 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-12 00:54:08,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:54:08,087 INFO L225 Difference]: With dead ends: 98 [2023-11-12 00:54:08,087 INFO L226 Difference]: Without dead ends: 75 [2023-11-12 00:54:08,089 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=316, Invalid=2336, Unknown=0, NotChecked=0, Total=2652 [2023-11-12 00:54:08,089 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 44 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:54:08,090 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 76 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-11-12 00:54:08,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-12 00:54:08,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 47. [2023-11-12 00:54:08,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 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) [2023-11-12 00:54:08,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2023-11-12 00:54:08,131 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 15 [2023-11-12 00:54:08,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:54:08,131 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2023-11-12 00:54:08,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:08,131 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2023-11-12 00:54:08,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:54:08,132 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:54:08,132 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1] [2023-11-12 00:54:08,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:54:08,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:08,339 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:54:08,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:54:08,339 INFO L85 PathProgramCache]: Analyzing trace with hash 49456043, now seen corresponding path program 3 times [2023-11-12 00:54:08,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:54:08,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726449251] [2023-11-12 00:54:08,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:54:08,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:54:08,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:54:08,624 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:08,625 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:54:08,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726449251] [2023-11-12 00:54:08,625 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726449251] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:54:08,625 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259824367] [2023-11-12 00:54:08,625 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:54:08,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:08,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:54:08,627 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:54:08,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:54:08,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:54:08,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:54:08,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-12 00:54:08,687 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:54:08,723 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:08,724 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:54:09,094 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:09,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259824367] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:54:09,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107182401] [2023-11-12 00:54:09,096 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:54:09,096 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:54:09,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:54:09,097 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:54:09,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:54:09,198 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:54:09,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2500#(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_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:54:09,440 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:54:09,440 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:54:09,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-11-12 00:54:09,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21452320] [2023-11-12 00:54:09,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:54:09,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:54:09,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:54:09,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:54:09,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=768, Unknown=0, NotChecked=0, Total=992 [2023-11-12 00:54:09,443 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:34,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:54:34,550 INFO L93 Difference]: Finished difference Result 233 states and 348 transitions. [2023-11-12 00:54:34,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-11-12 00:54:34,551 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:54:34,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:54:34,553 INFO L225 Difference]: With dead ends: 233 [2023-11-12 00:54:34,553 INFO L226 Difference]: Without dead ends: 216 [2023-11-12 00:54:34,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1207 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=1350, Invalid=3480, Unknown=0, NotChecked=0, Total=4830 [2023-11-12 00:54:34,556 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 537 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:54:34,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [537 Valid, 17 Invalid, 893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-12 00:54:34,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2023-11-12 00:54:34,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 78. [2023-11-12 00:54:34,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.4545454545454546) internal successors, (112), 77 states have internal predecessors, (112), 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) [2023-11-12 00:54:34,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 112 transitions. [2023-11-12 00:54:34,643 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 112 transitions. Word has length 16 [2023-11-12 00:54:34,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:54:34,644 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 112 transitions. [2023-11-12 00:54:34,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:54:34,644 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 112 transitions. [2023-11-12 00:54:34,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:54:34,645 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:54:34,645 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1] [2023-11-12 00:54:34,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 00:54:34,846 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:54:34,846 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:54:34,846 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:54:34,846 INFO L85 PathProgramCache]: Analyzing trace with hash -850230411, now seen corresponding path program 7 times [2023-11-12 00:54:34,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:54:34,847 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411278996] [2023-11-12 00:54:34,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:54:34,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:54:34,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:54:34,995 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:54:34,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:54:34,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411278996] [2023-11-12 00:54:34,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411278996] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:54:34,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12134713] [2023-11-12 00:54:34,996 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:54:34,996 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:34,996 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:54:34,997 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:54:35,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:54:35,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:54:35,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-12 00:54:35,058 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:54:35,127 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:54:35,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:54:35,315 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:54:35,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12134713] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:54:35,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1067823163] [2023-11-12 00:54:35,317 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:54:35,317 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:54:35,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:54:35,317 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:54:35,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:54:35,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:54:35,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3308#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:54:35,554 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:54:35,554 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:54:35,554 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 23 [2023-11-12 00:54:35,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179162560] [2023-11-12 00:54:35,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:54:35,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-12 00:54:35,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:54:35,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-12 00:54:35,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2023-11-12 00:54:35,557 INFO L87 Difference]: Start difference. First operand 78 states and 112 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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) [2023-11-12 00:54:36,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:54:36,252 INFO L93 Difference]: Finished difference Result 149 states and 197 transitions. [2023-11-12 00:54:36,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-12 00:54:36,252 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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 17 [2023-11-12 00:54:36,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:54:36,253 INFO L225 Difference]: With dead ends: 149 [2023-11-12 00:54:36,254 INFO L226 Difference]: Without dead ends: 114 [2023-11-12 00:54:36,255 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2023-11-12 00:54:36,256 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:54:36,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 40 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:54:36,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-12 00:54:36,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2023-11-12 00:54:36,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.4222222222222223) internal successors, (128), 90 states have internal predecessors, (128), 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) [2023-11-12 00:54:36,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 128 transitions. [2023-11-12 00:54:36,337 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 128 transitions. Word has length 17 [2023-11-12 00:54:36,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:54:36,338 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 128 transitions. [2023-11-12 00:54:36,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 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) [2023-11-12 00:54:36,338 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 128 transitions. [2023-11-12 00:54:36,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-12 00:54:36,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:54:36,339 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-11-12 00:54:36,349 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:54:36,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:36,543 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:54:36,543 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:54:36,544 INFO L85 PathProgramCache]: Analyzing trace with hash -1384460789, now seen corresponding path program 8 times [2023-11-12 00:54:36,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:54:36,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223104665] [2023-11-12 00:54:36,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:54:36,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:54:36,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:54:37,390 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:37,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:54:37,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223104665] [2023-11-12 00:54:37,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223104665] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:54:37,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231860260] [2023-11-12 00:54:37,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:54:37,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:54:37,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:54:37,392 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:54:37,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_02d96818-c693-4807-85c9-c9263db63390/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:54:37,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:54:37,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:54:37,487 WARN L260 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-12 00:54:37,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:54:38,305 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:38,305 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:54:39,133 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:54:39,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231860260] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:54:39,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670517898] [2023-11-12 00:54:39,135 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:54:39,135 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:54:39,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:54:39,135 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:54:39,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:54:39,241 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:54:39,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3924#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-12 00:54:39,439 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:54:39,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:54:39,439 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 12] total 34 [2023-11-12 00:54:39,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512049175] [2023-11-12 00:54:39,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:54:39,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-12 00:54:39,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:54:39,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-12 00:54:39,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1325, Unknown=0, NotChecked=0, Total=1482 [2023-11-12 00:54:39,442 INFO L87 Difference]: Start difference. First operand 91 states and 128 transitions. Second operand has 35 states, 35 states have (on average 1.4) internal successors, (49), 34 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)