./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/loop-acceleration/array3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) 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_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/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_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/loop-acceleration/array3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:13:35,082 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:13:35,207 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:13:35,214 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:13:35,215 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:13:35,261 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:13:35,261 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:13:35,262 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:13:35,263 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:13:35,268 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:13:35,269 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:13:35,270 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:13:35,270 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:13:35,272 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:13:35,273 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:13:35,273 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:13:35,273 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:13:35,274 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:13:35,274 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:13:35,275 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:13:35,275 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:13:35,276 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:13:35,276 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:13:35,277 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:13:35,278 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:13:35,278 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:13:35,279 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:13:35,279 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:13:35,280 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:13:35,280 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:13:35,281 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:13:35,282 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:13:35,282 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:13:35,282 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:13:35,282 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:13:35,283 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:13:35,283 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:13:35,283 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:13:35,283 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:13:35,284 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:35,284 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:13:35,285 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:13:35,285 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:13:35,285 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:13:35,286 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:13:35,286 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:13:35,286 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_d61af6de-5359-48c2-ab79-f56e233e7565/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea [2023-11-12 00:13:35,580 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:13:35,602 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:13:35,605 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:13:35,606 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:13:35,607 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:13:35,608 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/loop-acceleration/array3.i [2023-11-12 00:13:38,738 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:13:39,015 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:13:39,016 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/sv-benchmarks/c/loop-acceleration/array3.i [2023-11-12 00:13:39,023 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/data/2383f7c7f/d99b607426594f86bf4733d71b72ed56/FLAGac1e8a66d [2023-11-12 00:13:39,039 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/data/2383f7c7f/d99b607426594f86bf4733d71b72ed56 [2023-11-12 00:13:39,042 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:13:39,044 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:13:39,045 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:39,045 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:13:39,055 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:13:39,056 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,058 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b08432 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39, skipping insertion in model container [2023-11-12 00:13:39,058 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,082 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:13:39,301 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:39,312 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:13:39,333 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:39,352 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:13:39,353 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39 WrapperNode [2023-11-12 00:13:39,354 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:39,355 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:39,355 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:13:39,356 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:13:39,364 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,372 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,395 INFO L138 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 47 [2023-11-12 00:13:39,395 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:39,396 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:13:39,396 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:13:39,396 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:13:39,405 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,406 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,418 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,419 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,426 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,432 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,438 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,443 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,446 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:13:39,447 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:13:39,448 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:13:39,448 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:13:39,449 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (1/1) ... [2023-11-12 00:13:39,457 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:39,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:39,496 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:13:39,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:13:39,567 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:13:39,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:13:39,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:13:39,569 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:13:39,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:13:39,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:13:39,569 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:13:39,570 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:13:39,655 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:13:39,657 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:13:39,878 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:13:39,907 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:13:39,907 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-12 00:13:39,910 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:39 BoogieIcfgContainer [2023-11-12 00:13:39,910 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:13:39,913 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:13:39,914 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:13:39,917 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:13:39,918 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:13:39" (1/3) ... [2023-11-12 00:13:39,919 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76611af9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:39, skipping insertion in model container [2023-11-12 00:13:39,920 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:39" (2/3) ... [2023-11-12 00:13:39,922 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76611af9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:39, skipping insertion in model container [2023-11-12 00:13:39,922 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:39" (3/3) ... [2023-11-12 00:13:39,924 INFO L112 eAbstractionObserver]: Analyzing ICFG array3.i [2023-11-12 00:13:39,946 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:13:39,947 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2023-11-12 00:13:39,998 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:13:40,006 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@7c0bc76f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:13:40,006 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-11-12 00:13:40,011 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 19 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 00:13:40,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:13:40,018 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:40,019 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:13:40,020 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:40,029 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:40,029 INFO L85 PathProgramCache]: Analyzing trace with hash 97427, now seen corresponding path program 1 times [2023-11-12 00:13:40,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:40,043 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95597478] [2023-11-12 00:13:40,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:40,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:40,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:40,247 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 00:13:40,248 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:40,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95597478] [2023-11-12 00:13:40,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95597478] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:40,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:40,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:40,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898106265] [2023-11-12 00:13:40,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:40,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:40,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:40,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:40,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,304 INFO L87 Difference]: Start difference. First operand has 20 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 19 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) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:40,388 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2023-11-12 00:13:40,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:40,392 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2023-11-12 00:13:40,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:40,400 INFO L225 Difference]: With dead ends: 36 [2023-11-12 00:13:40,400 INFO L226 Difference]: Without dead ends: 35 [2023-11-12 00:13:40,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,406 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:40,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:40,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-12 00:13:40,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 22. [2023-11-12 00:13:40,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.6875) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:40,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-12 00:13:40,441 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 3 [2023-11-12 00:13:40,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:40,442 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-12 00:13:40,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,442 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-12 00:13:40,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:13:40,443 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:40,443 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:13:40,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:13:40,444 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:40,444 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:40,444 INFO L85 PathProgramCache]: Analyzing trace with hash 95461, now seen corresponding path program 1 times [2023-11-12 00:13:40,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:40,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931962359] [2023-11-12 00:13:40,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:40,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:40,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:40,514 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 00:13:40,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:40,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931962359] [2023-11-12 00:13:40,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931962359] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:40,515 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:40,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:40,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537259662] [2023-11-12 00:13:40,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:40,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:40,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:40,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:40,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,518 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:40,542 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2023-11-12 00:13:40,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:40,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2023-11-12 00:13:40,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:40,544 INFO L225 Difference]: With dead ends: 20 [2023-11-12 00:13:40,544 INFO L226 Difference]: Without dead ends: 20 [2023-11-12 00:13:40,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,546 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:40,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:40,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-12 00:13:40,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-12 00:13:40,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.5) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:40,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-12 00:13:40,552 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 3 [2023-11-12 00:13:40,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:40,568 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-12 00:13:40,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,569 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-12 00:13:40,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:13:40,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:40,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:13:40,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:13:40,570 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:40,571 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:40,571 INFO L85 PathProgramCache]: Analyzing trace with hash 95462, now seen corresponding path program 1 times [2023-11-12 00:13:40,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:40,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355380639] [2023-11-12 00:13:40,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:40,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:40,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:40,783 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 00:13:40,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:40,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355380639] [2023-11-12 00:13:40,784 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355380639] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:40,784 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:40,784 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:40,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571123923] [2023-11-12 00:13:40,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:40,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:40,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:40,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:40,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,787 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:40,818 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-12 00:13:40,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:40,819 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2023-11-12 00:13:40,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:40,820 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:13:40,820 INFO L226 Difference]: Without dead ends: 21 [2023-11-12 00:13:40,820 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:40,822 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:40,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:40,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-12 00:13:40,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-12 00:13:40,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 20 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 00:13:40,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-12 00:13:40,831 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 3 [2023-11-12 00:13:40,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:40,833 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-12 00:13:40,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 00:13:40,833 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-12 00:13:40,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:13:40,834 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:40,834 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:13:40,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:13:40,835 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:40,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:40,840 INFO L85 PathProgramCache]: Analyzing trace with hash 91795087, now seen corresponding path program 1 times [2023-11-12 00:13:40,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:40,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606506260] [2023-11-12 00:13:40,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:40,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:40,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:40,931 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 00:13:40,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:40,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606506260] [2023-11-12 00:13:40,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606506260] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:40,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027522544] [2023-11-12 00:13:40,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:40,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:40,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:40,936 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:40,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:13:41,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:41,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:13:41,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:41,093 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 00:13:41,094 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:41,129 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 00:13:41,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027522544] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:41,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602924375] [2023-11-12 00:13:41,175 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 00:13:41,175 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:41,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:41,185 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:41,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:41,919 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:42,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '203#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) 3) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0))' at error location [2023-11-12 00:13:42,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:42,013 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:42,014 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 00:13:42,014 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652777141] [2023-11-12 00:13:42,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:42,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:13:42,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:42,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:13:42,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:13:42,020 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 00:13:42,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:42,169 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2023-11-12 00:13:42,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:13:42,170 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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) Word has length 5 [2023-11-12 00:13:42,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:42,173 INFO L225 Difference]: With dead ends: 73 [2023-11-12 00:13:42,174 INFO L226 Difference]: Without dead ends: 73 [2023-11-12 00:13:42,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:13:42,176 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 96 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:42,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 36 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:42,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-11-12 00:13:42,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 35. [2023-11-12 00:13:42,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 31 states have (on average 1.5161290322580645) internal successors, (47), 34 states have internal predecessors, (47), 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 00:13:42,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2023-11-12 00:13:42,185 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 5 [2023-11-12 00:13:42,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:42,185 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2023-11-12 00:13:42,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 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 00:13:42,186 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2023-11-12 00:13:42,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:13:42,186 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:42,187 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-12 00:13:42,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:42,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:42,399 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:42,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:42,400 INFO L85 PathProgramCache]: Analyzing trace with hash 91793121, now seen corresponding path program 1 times [2023-11-12 00:13:42,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:42,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178713799] [2023-11-12 00:13:42,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:42,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:42,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:42,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:42,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:42,631 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178713799] [2023-11-12 00:13:42,631 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178713799] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:42,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370482464] [2023-11-12 00:13:42,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:42,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:42,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:42,640 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:42,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:13:42,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:42,705 INFO L262 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:13:42,706 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:42,744 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-12 00:13:42,803 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:42,804 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:42,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:42,865 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370482464] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:42,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [990260714] [2023-11-12 00:13:42,868 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-12 00:13:42,868 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:42,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:42,869 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:42,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:43,184 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:43,277 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '348#(and (<= |ULTIMATE.start_main_#t~nondet2#1| 2147483647) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet2#1|)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:13:43,278 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:43,278 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:43,278 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 7 [2023-11-12 00:13:43,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251503871] [2023-11-12 00:13:43,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:43,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:13:43,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:43,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:13:43,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:13:43,281 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:43,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:43,430 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2023-11-12 00:13:43,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:13:43,431 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-12 00:13:43,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:43,433 INFO L225 Difference]: With dead ends: 52 [2023-11-12 00:13:43,433 INFO L226 Difference]: Without dead ends: 52 [2023-11-12 00:13:43,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2023-11-12 00:13:43,434 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 89 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:43,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 49 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:43,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-12 00:13:43,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2023-11-12 00:13:43,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 31 states have internal predecessors, (36), 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 00:13:43,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2023-11-12 00:13:43,441 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 5 [2023-11-12 00:13:43,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:43,441 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2023-11-12 00:13:43,442 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:43,442 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2023-11-12 00:13:43,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:13:43,443 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:43,443 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:43,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:43,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:43,649 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:43,649 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:43,650 INFO L85 PathProgramCache]: Analyzing trace with hash -1239287240, now seen corresponding path program 1 times [2023-11-12 00:13:43,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:43,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851570419] [2023-11-12 00:13:43,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:43,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:43,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:43,828 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:13:43,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:43,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851570419] [2023-11-12 00:13:43,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851570419] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:43,832 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:43,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:13:43,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236772067] [2023-11-12 00:13:43,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:43,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:43,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:43,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:43,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:43,835 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:43,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:43,867 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-11-12 00:13:43,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:43,869 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:13:43,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:43,872 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:13:43,872 INFO L226 Difference]: Without dead ends: 29 [2023-11-12 00:13:43,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:13:43,874 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:43,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 7 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:43,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-12 00:13:43,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-12 00:13:43,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:43,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2023-11-12 00:13:43,885 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2023-11-12 00:13:43,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:43,885 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2023-11-12 00:13:43,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:43,886 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2023-11-12 00:13:43,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:13:43,887 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:43,887 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:43,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:13:43,888 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:43,888 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:43,889 INFO L85 PathProgramCache]: Analyzing trace with hash -1239294639, now seen corresponding path program 1 times [2023-11-12 00:13:43,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:43,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699645613] [2023-11-12 00:13:43,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:43,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:44,021 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:44,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:44,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699645613] [2023-11-12 00:13:44,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699645613] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:44,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395789562] [2023-11-12 00:13:44,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:44,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:44,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:44,024 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:44,028 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:13:44,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:44,088 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:13:44,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:44,117 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:44,117 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:44,192 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:44,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395789562] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:44,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [155518204] [2023-11-12 00:13:44,201 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:13:44,201 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:44,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:44,202 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:44,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:44,476 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:44,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '606#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (exists ((|v_#valid_24| (Array Int Int)) (|v_ULTIMATE.start_main_~#A~0#1.base_18| Int)) (and (= (store |v_#valid_24| |v_ULTIMATE.start_main_~#A~0#1.base_18| 0) |#valid|) (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#A~0#1.base_18|) 0) 0) (= (select |v_#valid_24| |v_ULTIMATE.start_main_~#A~0#1.base_18|) 1) (<= 2 |v_ULTIMATE.start_main_~#A~0#1.base_18|) (<= 4 (select |#length| |v_ULTIMATE.start_main_~#A~0#1.base_18|)))))' at error location [2023-11-12 00:13:44,686 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:44,686 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:44,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-12 00:13:44,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210086649] [2023-11-12 00:13:44,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:44,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:13:44,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:44,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:13:44,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:13:44,689 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:44,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:44,821 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2023-11-12 00:13:44,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 00:13:44,822 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:13:44,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:44,824 INFO L225 Difference]: With dead ends: 117 [2023-11-12 00:13:44,824 INFO L226 Difference]: Without dead ends: 117 [2023-11-12 00:13:44,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:13:44,825 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 152 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:44,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 55 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:44,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-12 00:13:44,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 41. [2023-11-12 00:13:44,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 40 states have internal predecessors, (45), 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 00:13:44,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-11-12 00:13:44,832 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 16 [2023-11-12 00:13:44,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:44,833 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-11-12 00:13:44,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:44,833 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-11-12 00:13:44,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:13:44,834 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:44,835 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:44,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:45,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:45,041 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:45,042 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:45,044 INFO L85 PathProgramCache]: Analyzing trace with hash 2048680431, now seen corresponding path program 2 times [2023-11-12 00:13:45,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:45,045 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284905622] [2023-11-12 00:13:45,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:45,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:45,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:45,371 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:45,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:45,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284905622] [2023-11-12 00:13:45,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284905622] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:45,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379500694] [2023-11-12 00:13:45,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:13:45,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:45,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:45,376 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:45,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:13:45,441 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-12 00:13:45,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:45,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:13:45,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:45,585 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~#A~0#1.base_19| Int)) (and (= (select |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_main_~#A~0#1.base_19|) 0) (= |c_#valid| (store |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_main_~#A~0#1.base_19| 0)))) is different from true [2023-11-12 00:13:45,589 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-12 00:13:45,590 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:13:45,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379500694] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:45,590 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:13:45,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [12] total 14 [2023-11-12 00:13:45,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978692053] [2023-11-12 00:13:45,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:45,592 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:45,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:45,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:45,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=103, Unknown=1, NotChecked=24, Total=210 [2023-11-12 00:13:45,593 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 00:13:45,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:45,642 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2023-11-12 00:13:45,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:45,642 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2023-11-12 00:13:45,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:45,643 INFO L225 Difference]: With dead ends: 40 [2023-11-12 00:13:45,643 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:13:45,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=103, Unknown=1, NotChecked=24, Total=210 [2023-11-12 00:13:45,644 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:45,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 5 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2023-11-12 00:13:45,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:13:45,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-11-12 00:13:45,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:45,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2023-11-12 00:13:45,663 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 28 [2023-11-12 00:13:45,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:45,663 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2023-11-12 00:13:45,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 00:13:45,664 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2023-11-12 00:13:45,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-12 00:13:45,665 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:45,665 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 4, 4, 4, 1, 1, 1] [2023-11-12 00:13:45,680 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:45,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 00:13:45,866 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:45,866 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:45,866 INFO L85 PathProgramCache]: Analyzing trace with hash 130550114, now seen corresponding path program 1 times [2023-11-12 00:13:45,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:45,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032919575] [2023-11-12 00:13:45,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:45,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:45,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:46,140 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:46,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:46,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032919575] [2023-11-12 00:13:46,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2032919575] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:46,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234224719] [2023-11-12 00:13:46,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:46,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:46,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:46,161 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:46,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:13:46,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:46,259 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 00:13:46,263 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:46,308 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:46,309 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:46,565 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:46,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234224719] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:46,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [462454161] [2023-11-12 00:13:46,568 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:13:46,568 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:46,569 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:46,569 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:46,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:46,861 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:47,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1173#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:13:47,006 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:47,006 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:47,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-12 00:13:47,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291210686] [2023-11-12 00:13:47,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:47,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-12 00:13:47,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:47,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-12 00:13:47,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=556, Unknown=0, NotChecked=0, Total=870 [2023-11-12 00:13:47,011 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:47,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:47,267 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2023-11-12 00:13:47,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-12 00:13:47,268 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-11-12 00:13:47,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:47,269 INFO L225 Difference]: With dead ends: 134 [2023-11-12 00:13:47,269 INFO L226 Difference]: Without dead ends: 134 [2023-11-12 00:13:47,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=314, Invalid=556, Unknown=0, NotChecked=0, Total=870 [2023-11-12 00:13:47,272 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 170 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:47,273 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 24 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:13:47,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-11-12 00:13:47,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 60. [2023-11-12 00:13:47,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 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 00:13:47,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2023-11-12 00:13:47,294 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 35 [2023-11-12 00:13:47,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:47,294 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2023-11-12 00:13:47,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:47,295 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2023-11-12 00:13:47,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-12 00:13:47,296 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:47,297 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 4, 4, 4, 1, 1, 1] [2023-11-12 00:13:47,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:47,497 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:13:47,497 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:47,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:47,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1366670246, now seen corresponding path program 2 times [2023-11-12 00:13:47,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:47,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147359318] [2023-11-12 00:13:47,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:47,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:47,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:48,296 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:48,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:48,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147359318] [2023-11-12 00:13:48,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147359318] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:48,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082160745] [2023-11-12 00:13:48,297 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:13:48,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:48,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:48,298 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:48,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:13:48,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 00:13:48,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:48,416 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-12 00:13:48,420 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:48,575 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-11-12 00:13:48,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:48,901 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2023-11-12 00:13:48,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082160745] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:48,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [726578704] [2023-11-12 00:13:48,904 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:13:48,904 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:48,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:48,904 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:48,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:49,267 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:49,497 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1759#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:13:49,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:49,497 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:49,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 39 [2023-11-12 00:13:49,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964977901] [2023-11-12 00:13:49,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:49,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-11-12 00:13:49,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:49,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-11-12 00:13:49,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=1334, Unknown=0, NotChecked=0, Total=1892 [2023-11-12 00:13:49,501 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:50,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:50,909 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2023-11-12 00:13:50,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-12 00:13:50,910 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2023-11-12 00:13:50,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:50,911 INFO L225 Difference]: With dead ends: 135 [2023-11-12 00:13:50,911 INFO L226 Difference]: Without dead ends: 135 [2023-11-12 00:13:50,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1896 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1796, Invalid=4524, Unknown=0, NotChecked=0, Total=6320 [2023-11-12 00:13:50,914 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 254 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:50,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 32 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:13:50,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-12 00:13:50,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 80. [2023-11-12 00:13:50,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 states have internal predecessors, (81), 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 00:13:50,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2023-11-12 00:13:50,920 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 59 [2023-11-12 00:13:50,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:50,920 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2023-11-12 00:13:50,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:50,921 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2023-11-12 00:13:50,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-11-12 00:13:50,923 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:50,923 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 10, 10, 10, 1, 1, 1] [2023-11-12 00:13:50,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:51,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:13:51,129 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:51,130 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:51,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1276982783, now seen corresponding path program 3 times [2023-11-12 00:13:51,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:51,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855286292] [2023-11-12 00:13:51,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:51,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:51,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:52,123 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:13:52,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:52,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855286292] [2023-11-12 00:13:52,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855286292] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:52,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949334289] [2023-11-12 00:13:52,123 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:13:52,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:52,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:52,125 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:52,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:13:53,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:13:53,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:53,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-12 00:13:53,065 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:53,162 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:13:53,162 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:54,154 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:13:54,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949334289] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:54,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746744714] [2023-11-12 00:13:54,157 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:13:54,157 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:54,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:54,158 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:54,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:54,441 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:54,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2592#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:13:54,631 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:54,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:54,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2023-11-12 00:13:54,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947717380] [2023-11-12 00:13:54,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-12 00:13:54,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-12 00:13:54,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1289, Invalid=1791, Unknown=0, NotChecked=0, Total=3080 [2023-11-12 00:13:54,636 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 00:13:55,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:55,324 INFO L93 Difference]: Finished difference Result 284 states and 285 transitions. [2023-11-12 00:13:55,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-12 00:13:55,324 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 79 [2023-11-12 00:13:55,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:55,326 INFO L225 Difference]: With dead ends: 284 [2023-11-12 00:13:55,327 INFO L226 Difference]: Without dead ends: 284 [2023-11-12 00:13:55,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1289, Invalid=1791, Unknown=0, NotChecked=0, Total=3080 [2023-11-12 00:13:55,329 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 477 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 477 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:55,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [477 Valid, 50 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:13:55,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2023-11-12 00:13:55,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 130. [2023-11-12 00:13:55,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:55,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2023-11-12 00:13:55,337 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 79 [2023-11-12 00:13:55,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:55,337 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2023-11-12 00:13:55,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 00:13:55,338 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2023-11-12 00:13:55,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2023-11-12 00:13:55,340 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:55,340 INFO L195 NwaCegarLoop]: trace histogram [48, 48, 10, 10, 10, 1, 1, 1] [2023-11-12 00:13:55,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:55,548 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:13:55,549 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:13:55,551 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:55,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1135259140, now seen corresponding path program 4 times [2023-11-12 00:13:55,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:55,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610356052] [2023-11-12 00:13:55,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:55,552 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:55,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:58,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:13:58,338 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:58,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610356052] [2023-11-12 00:13:58,338 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610356052] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:58,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746959952] [2023-11-12 00:13:58,339 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:13:58,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:58,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:58,340 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:58,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:13:58,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:58,574 INFO L262 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-12 00:13:58,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:58,756 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:13:58,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:02,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:14:02,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746959952] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:02,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [991262493] [2023-11-12 00:14:02,489 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:02,489 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:02,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:02,490 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:02,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:02,747 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:03,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3880#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~i~0#1| 1024))' at error location [2023-11-12 00:14:03,655 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:03,655 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:03,655 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2023-11-12 00:14:03,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664181337] [2023-11-12 00:14:03,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:03,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-11-12 00:14:03,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:03,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-11-12 00:14:03,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5062, Invalid=5858, Unknown=0, NotChecked=0, Total=10920 [2023-11-12 00:14:03,665 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 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 00:14:06,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:06,019 INFO L93 Difference]: Finished difference Result 584 states and 585 transitions. [2023-11-12 00:14:06,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-11-12 00:14:06,028 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 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 129 [2023-11-12 00:14:06,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:06,036 INFO L225 Difference]: With dead ends: 584 [2023-11-12 00:14:06,037 INFO L226 Difference]: Without dead ends: 584 [2023-11-12 00:14:06,040 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 312 SyntacticMatches, 20 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3761 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5062, Invalid=5858, Unknown=0, NotChecked=0, Total=10920 [2023-11-12 00:14:06,041 INFO L413 NwaCegarLoop]: 1 mSDtfsCounter, 1110 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1110 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:06,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1110 Valid, 100 Invalid, 882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:14:06,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2023-11-12 00:14:06,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 230. [2023-11-12 00:14:06,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 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 00:14:06,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2023-11-12 00:14:06,055 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 129 [2023-11-12 00:14:06,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:06,058 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2023-11-12 00:14:06,058 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 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 00:14:06,058 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2023-11-12 00:14:06,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2023-11-12 00:14:06,072 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:06,072 INFO L195 NwaCegarLoop]: trace histogram [98, 98, 10, 10, 10, 1, 1, 1] [2023-11-12 00:14:06,083 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:06,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-12 00:14:06,284 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-11-12 00:14:06,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:06,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1082478134, now seen corresponding path program 5 times [2023-11-12 00:14:06,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:06,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164055906] [2023-11-12 00:14:06,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:06,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:06,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:15,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 0 proven. 9604 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2023-11-12 00:14:15,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:15,523 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164055906] [2023-11-12 00:14:15,524 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164055906] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:15,524 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228644486] [2023-11-12 00:14:15,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:15,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:15,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:15,525 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:15,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d61af6de-5359-48c2-ab79-f56e233e7565/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:14:15,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-12 00:14:15,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:15,813 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-12 00:14:15,820 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:16,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2023-11-12 00:14:16,188 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2023-11-12 00:14:17,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228644486] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:17,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833708812] [2023-11-12 00:14:17,469 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:17,469 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:17,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:17,470 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:17,470 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:17,748 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:19,403 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6193#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#A~0#1.base|) (+ 3 (* |ULTIMATE.start_main_~i~0#1| 4))) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~i~0#1| 1024))' at error location [2023-11-12 00:14:19,403 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:19,403 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:19,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 14, 14] total 127 [2023-11-12 00:14:19,403 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012403338] [2023-11-12 00:14:19,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:19,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2023-11-12 00:14:19,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:19,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2023-11-12 00:14:19,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6591, Invalid=10439, Unknown=0, NotChecked=0, Total=17030 [2023-11-12 00:14:19,413 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 127 states, 127 states have (on average 2.1338582677165356) internal successors, (271), 127 states have internal predecessors, (271), 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)