./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-1.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_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/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_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/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_d0857323-a09e-4faf-9973-a0218f7ecfb5/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 4591ef5e575ce80e216cc4837705a7c6f141a943d9af6ca1eb606ab877abd06b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:13:47,724 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:13:47,850 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:13:47,857 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:13:47,858 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:13:47,885 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:13:47,886 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:13:47,887 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:13:47,888 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:13:47,889 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:13:47,890 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:13:47,890 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:13:47,891 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:13:47,892 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:13:47,893 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:13:47,894 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:13:47,894 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:13:47,895 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:13:47,896 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:13:47,896 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:13:47,897 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:13:47,898 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:13:47,899 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:13:47,899 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:13:47,900 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:13:47,900 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:13:47,901 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:13:47,901 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:13:47,902 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:13:47,903 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:13:47,903 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:13:47,904 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:13:47,904 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:13:47,905 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:13:47,905 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:13:47,906 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:13:47,906 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:13:47,907 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:13:47,907 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:13:47,908 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:47,908 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:13:47,909 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:13:47,910 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:13:47,910 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:13:47,911 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:13:47,911 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:13:47,912 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_d0857323-a09e-4faf-9973-a0218f7ecfb5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4591ef5e575ce80e216cc4837705a7c6f141a943d9af6ca1eb606ab877abd06b [2023-11-12 00:13:48,277 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:13:48,316 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:13:48,319 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:13:48,321 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:13:48,323 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:13:48,324 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/memsafety/960521-1-1.i [2023-11-12 00:13:51,639 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:13:51,922 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:13:51,923 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/sv-benchmarks/c/memsafety/960521-1-1.i [2023-11-12 00:13:51,944 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/data/79fc4b3d3/bc20505092c74aeb99fbaf1f7f02ee7c/FLAG7ee05d6c3 [2023-11-12 00:13:51,964 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/data/79fc4b3d3/bc20505092c74aeb99fbaf1f7f02ee7c [2023-11-12 00:13:51,971 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:13:51,973 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:13:51,975 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:51,975 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:13:51,991 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:13:52,011 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:51" (1/1) ... [2023-11-12 00:13:52,013 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8fd0f39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52, skipping insertion in model container [2023-11-12 00:13:52,013 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:51" (1/1) ... [2023-11-12 00:13:52,085 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:13:52,383 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:52,397 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:13:52,472 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:52,502 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:13:52,503 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52 WrapperNode [2023-11-12 00:13:52,503 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:52,504 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:52,504 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:13:52,504 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:13:52,512 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,525 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,547 INFO L138 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2023-11-12 00:13:52,548 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:52,549 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:13:52,549 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:13:52,549 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:13:52,559 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,559 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,563 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,564 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,571 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,574 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,576 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,577 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,580 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:13:52,581 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:13:52,581 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:13:52,581 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:13:52,582 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (1/1) ... [2023-11-12 00:13:52,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:52,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:52,616 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:13:52,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:13:52,654 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:13:52,654 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:13:52,654 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:13:52,654 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:13:52,655 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:13:52,655 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:13:52,655 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:13:52,655 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:13:52,760 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:13:52,761 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:13:52,969 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:13:53,023 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:13:53,024 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-12 00:13:53,026 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:53 BoogieIcfgContainer [2023-11-12 00:13:53,027 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:13:53,030 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:13:53,032 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:13:53,036 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:13:53,036 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:13:51" (1/3) ... [2023-11-12 00:13:53,038 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@429faeb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:53, skipping insertion in model container [2023-11-12 00:13:53,039 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:52" (2/3) ... [2023-11-12 00:13:53,040 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@429faeb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:53, skipping insertion in model container [2023-11-12 00:13:53,041 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:53" (3/3) ... [2023-11-12 00:13:53,042 INFO L112 eAbstractionObserver]: Analyzing ICFG 960521-1-1.i [2023-11-12 00:13:53,063 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:13:53,064 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2023-11-12 00:13:53,128 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:13:53,135 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;@7b331fbb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:13:53,136 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2023-11-12 00:13:53,142 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:53,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-12 00:13:53,150 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:53,151 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-12 00:13:53,151 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:53,159 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:53,160 INFO L85 PathProgramCache]: Analyzing trace with hash 3507, now seen corresponding path program 1 times [2023-11-12 00:13:53,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:53,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334517992] [2023-11-12 00:13:53,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:53,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:53,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:53,535 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 00:13:53,536 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:53,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334517992] [2023-11-12 00:13:53,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334517992] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:53,537 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:53,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:53,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139781028] [2023-11-12 00:13:53,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:53,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:53,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:53,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:53,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:53,595 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 00:13:53,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:53,694 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2023-11-12 00:13:53,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:53,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2023-11-12 00:13:53,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:53,706 INFO L225 Difference]: With dead ends: 43 [2023-11-12 00:13:53,706 INFO L226 Difference]: Without dead ends: 42 [2023-11-12 00:13:53,709 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 00:13:53,713 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:53,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:53,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-12 00:13:53,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-11-12 00:13:53,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 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 00:13:53,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2023-11-12 00:13:53,757 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2023-11-12 00:13:53,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:53,758 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2023-11-12 00:13:53,758 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 00:13:53,760 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2023-11-12 00:13:53,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-12 00:13:53,761 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:53,762 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-12 00:13:53,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:13:53,763 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:53,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:53,764 INFO L85 PathProgramCache]: Analyzing trace with hash 3508, now seen corresponding path program 1 times [2023-11-12 00:13:53,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:53,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825920676] [2023-11-12 00:13:53,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:53,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:53,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:53,989 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 00:13:53,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:53,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825920676] [2023-11-12 00:13:53,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825920676] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:53,990 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:53,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:13:54,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008522535] [2023-11-12 00:13:54,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:54,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:54,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:54,012 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 00:13:54,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:54,060 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2023-11-12 00:13:54,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:54,061 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 2 [2023-11-12 00:13:54,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:54,063 INFO L225 Difference]: With dead ends: 41 [2023-11-12 00:13:54,063 INFO L226 Difference]: Without dead ends: 41 [2023-11-12 00:13:54,069 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 00:13:54,071 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:54,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:54,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-12 00:13:54,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-12 00:13:54,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 states have internal predecessors, (43), 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 00:13:54,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-11-12 00:13:54,087 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2023-11-12 00:13:54,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:54,088 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-11-12 00:13:54,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 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 00:13:54,088 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-11-12 00:13:54,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:13:54,089 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:54,089 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:13:54,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:13:54,089 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:54,091 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:54,091 INFO L85 PathProgramCache]: Analyzing trace with hash 3443713, now seen corresponding path program 1 times [2023-11-12 00:13:54,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:54,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51825408] [2023-11-12 00:13:54,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:54,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:54,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:54,252 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 00:13:54,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:54,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51825408] [2023-11-12 00:13:54,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51825408] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:54,253 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:54,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:54,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387609408] [2023-11-12 00:13:54,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:54,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:54,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,256 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 00:13:54,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:54,307 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2023-11-12 00:13:54,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:54,307 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2023-11-12 00:13:54,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:54,309 INFO L225 Difference]: With dead ends: 38 [2023-11-12 00:13:54,309 INFO L226 Difference]: Without dead ends: 38 [2023-11-12 00:13:54,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,311 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 42 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:54,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:54,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-12 00:13:54,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-12 00:13:54,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:54,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2023-11-12 00:13:54,319 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2023-11-12 00:13:54,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:54,319 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2023-11-12 00:13:54,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 00:13:54,320 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2023-11-12 00:13:54,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:13:54,321 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:54,323 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:13:54,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:13:54,324 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:54,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:54,325 INFO L85 PathProgramCache]: Analyzing trace with hash 3443714, now seen corresponding path program 1 times [2023-11-12 00:13:54,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:54,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779330902] [2023-11-12 00:13:54,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:54,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:54,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:54,654 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 00:13:54,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:54,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779330902] [2023-11-12 00:13:54,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779330902] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:54,656 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:54,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:54,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565889990] [2023-11-12 00:13:54,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:54,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:54,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,659 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 00:13:54,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:54,765 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2023-11-12 00:13:54,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:54,768 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 4 [2023-11-12 00:13:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:54,772 INFO L225 Difference]: With dead ends: 44 [2023-11-12 00:13:54,772 INFO L226 Difference]: Without dead ends: 44 [2023-11-12 00:13:54,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,777 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:54,778 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:54,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-12 00:13:54,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-11-12 00:13:54,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.76) internal successors, (44), 40 states have internal predecessors, (44), 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 00:13:54,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2023-11-12 00:13:54,783 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 4 [2023-11-12 00:13:54,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:54,783 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2023-11-12 00:13:54,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 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 00:13:54,784 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2023-11-12 00:13:54,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:13:54,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:54,784 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:13:54,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:13:54,785 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:54,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:54,785 INFO L85 PathProgramCache]: Analyzing trace with hash 106825754, now seen corresponding path program 1 times [2023-11-12 00:13:54,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:54,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934024941] [2023-11-12 00:13:54,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:54,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:54,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:54,857 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 00:13:54,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:54,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934024941] [2023-11-12 00:13:54,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934024941] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:54,858 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:54,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:13:54,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312804331] [2023-11-12 00:13:54,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,860 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:54,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:54,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,862 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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 00:13:54,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:54,898 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2023-11-12 00:13:54,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:54,898 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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 00:13:54,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:54,899 INFO L225 Difference]: With dead ends: 44 [2023-11-12 00:13:54,900 INFO L226 Difference]: Without dead ends: 44 [2023-11-12 00:13:54,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:54,902 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:54,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 61 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:54,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-12 00:13:54,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-11-12 00:13:54,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.72) internal successors, (43), 40 states have internal predecessors, (43), 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 00:13:54,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-11-12 00:13:54,917 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 5 [2023-11-12 00:13:54,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:54,917 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-11-12 00:13:54,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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 00:13:54,918 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-11-12 00:13:54,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:13:54,918 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:54,918 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-11-12 00:13:54,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:13:54,919 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:54,920 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:54,920 INFO L85 PathProgramCache]: Analyzing trace with hash -985496187, now seen corresponding path program 1 times [2023-11-12 00:13:54,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:54,921 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552028663] [2023-11-12 00:13:54,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:54,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:54,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:55,295 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 00:13:55,295 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:55,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552028663] [2023-11-12 00:13:55,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552028663] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:55,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [736248302] [2023-11-12 00:13:55,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:55,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:55,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:55,307 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:55,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:13:55,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:55,386 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:13:55,391 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:55,464 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-12 00:13:55,465 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 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-12 00:13:55,592 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 00:13:55,592 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:55,683 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 00:13:55,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [736248302] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:55,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239082403] [2023-11-12 00:13:55,703 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 00:13:55,703 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:55,708 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:55,713 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:55,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:56,265 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:56,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '520#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_foo_~i~0#1| 127) (= ~n~0 128) (<= (select |#length| ~a~0.base) (+ 3 (* |ULTIMATE.start_foo_~i~0#1| 4))) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:13:56,598 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:56,598 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:56,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2023-11-12 00:13:56,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046521598] [2023-11-12 00:13:56,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:56,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-12 00:13:56,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:56,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-12 00:13:56,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:13:56,601 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:56,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:56,964 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2023-11-12 00:13:56,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:13:56,965 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:13:56,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:56,966 INFO L225 Difference]: With dead ends: 53 [2023-11-12 00:13:56,966 INFO L226 Difference]: Without dead ends: 53 [2023-11-12 00:13:56,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:13:56,968 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 127 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:56,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 95 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:13:56,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-12 00:13:56,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2023-11-12 00:13:56,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 48 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:56,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2023-11-12 00:13:56,974 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 6 [2023-11-12 00:13:56,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:56,975 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2023-11-12 00:13:56,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:56,975 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2023-11-12 00:13:56,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:13:56,976 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:56,976 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-11-12 00:13:56,987 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:13:57,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:57,183 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:57,183 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:57,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519764, now seen corresponding path program 1 times [2023-11-12 00:13:57,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:57,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835477869] [2023-11-12 00:13:57,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:57,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:57,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:57,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-12 00:13:57,236 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:57,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835477869] [2023-11-12 00:13:57,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835477869] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:57,237 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:57,237 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:13:57,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387132175] [2023-11-12 00:13:57,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:57,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:13:57,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:57,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:13:57,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:13:57,239 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:57,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:57,287 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2023-11-12 00:13:57,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:13:57,287 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:13:57,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:57,288 INFO L225 Difference]: With dead ends: 47 [2023-11-12 00:13:57,288 INFO L226 Difference]: Without dead ends: 47 [2023-11-12 00:13:57,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 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 00:13:57,290 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 14 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:57,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:57,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-12 00:13:57,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-11-12 00:13:57,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 46 states have internal predecessors, (53), 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 00:13:57,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2023-11-12 00:13:57,295 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 9 [2023-11-12 00:13:57,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:57,296 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2023-11-12 00:13:57,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:57,296 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2023-11-12 00:13:57,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:13:57,297 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:57,297 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-11-12 00:13:57,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 00:13:57,297 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:57,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:57,298 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519765, now seen corresponding path program 1 times [2023-11-12 00:13:57,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:57,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338446343] [2023-11-12 00:13:57,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:57,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:57,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:57,368 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:57,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:57,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338446343] [2023-11-12 00:13:57,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338446343] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:57,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400548647] [2023-11-12 00:13:57,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:57,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:57,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:57,373 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:57,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:13:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:57,461 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:13:57,462 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:57,520 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:57,520 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:57,575 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:57,575 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400548647] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:57,575 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520121808] [2023-11-12 00:13:57,578 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:13:57,578 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:57,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:57,579 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:57,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:57,918 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:58,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '797#(and (or (< ~b~0.offset 0) (< (select |#length| ~b~0.base) (+ ~b~0.offset 4))) (= |ULTIMATE.start_foo_~i~0#1| 0) (exists ((|v_ULTIMATE.start_foo_~i~0#1_51| Int)) (and (<= 1 |#StackHeapBarrier|) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= 128 |v_ULTIMATE.start_foo_~i~0#1_51|))))' at error location [2023-11-12 00:13:58,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:58,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:58,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2023-11-12 00:13:58,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232987986] [2023-11-12 00:13:58,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:58,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:13:58,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:58,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:13:58,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:13:58,218 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:58,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:58,343 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2023-11-12 00:13:58,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:13:58,344 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:13:58,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:58,344 INFO L225 Difference]: With dead ends: 59 [2023-11-12 00:13:58,344 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 00:13:58,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:13:58,346 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 91 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:58,346 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 78 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:13:58,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 00:13:58,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 50. [2023-11-12 00:13:58,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 49 states have internal predecessors, (55), 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 00:13:58,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2023-11-12 00:13:58,350 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 9 [2023-11-12 00:13:58,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:58,351 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2023-11-12 00:13:58,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:13:58,351 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2023-11-12 00:13:58,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:13:58,351 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:58,352 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2023-11-12 00:13:58,364 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:58,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:58,564 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:13:58,565 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:58,565 INFO L85 PathProgramCache]: Analyzing trace with hash -1172884082, now seen corresponding path program 2 times [2023-11-12 00:13:58,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:58,565 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847282524] [2023-11-12 00:13:58,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:58,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:58,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:58,950 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:13:58,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:58,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847282524] [2023-11-12 00:13:58,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847282524] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:58,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238199819] [2023-11-12 00:13:58,951 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:13:58,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:58,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:58,953 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:58,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:13:59,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:13:59,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:59,035 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 00:13:59,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:59,057 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-12 00:13:59,058 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 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-12 00:13:59,270 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:59,271 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:59,459 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:13:59,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238199819] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:59,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [732835210] [2023-11-12 00:13:59,461 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 00:13:59,462 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:59,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:59,462 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:59,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:59,778 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:00,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '998#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_foo_~i~0#1| 127) (= ~n~0 128) (<= (select |#length| ~a~0.base) (+ 3 (* |ULTIMATE.start_foo_~i~0#1| 4))) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:00,068 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:00,068 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:00,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 3, 3] total 13 [2023-11-12 00:14:00,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5074504] [2023-11-12 00:14:00,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:00,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:14:00,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:00,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:14:00,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:14:00,070 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:14:00,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:00,399 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2023-11-12 00:14:00,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:14:00,401 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:14:00,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:00,402 INFO L225 Difference]: With dead ends: 49 [2023-11-12 00:14:00,402 INFO L226 Difference]: Without dead ends: 49 [2023-11-12 00:14:00,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2023-11-12 00:14:00,403 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 38 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:00,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 98 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:14:00,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-12 00:14:00,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-11-12 00:14:00,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.394736842105263) internal successors, (53), 48 states have internal predecessors, (53), 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 00:14:00,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2023-11-12 00:14:00,407 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 12 [2023-11-12 00:14:00,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:00,408 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2023-11-12 00:14:00,408 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:14:00,408 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2023-11-12 00:14:00,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:14:00,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:00,409 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2023-11-12 00:14:00,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:00,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:14:00,615 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:00,616 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:00,616 INFO L85 PathProgramCache]: Analyzing trace with hash -845963127, now seen corresponding path program 2 times [2023-11-12 00:14:00,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:00,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766294689] [2023-11-12 00:14:00,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:00,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:00,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:00,812 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:14:00,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:00,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766294689] [2023-11-12 00:14:00,812 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766294689] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:00,812 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490130949] [2023-11-12 00:14:00,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:00,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:00,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:00,814 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:00,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:14:00,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-12 00:14:00,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:00,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:14:00,897 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:00,917 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:14:01,000 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-12 00:14:01,000 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:14:01,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490130949] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:14:01,000 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:14:01,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [9] total 11 [2023-11-12 00:14:01,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827193646] [2023-11-12 00:14:01,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:14:01,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:14:01,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:01,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:14:01,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:14:01,003 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:14:01,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:01,032 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2023-11-12 00:14:01,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:14:01,032 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-12 00:14:01,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:01,033 INFO L225 Difference]: With dead ends: 37 [2023-11-12 00:14:01,033 INFO L226 Difference]: Without dead ends: 37 [2023-11-12 00:14:01,034 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:14:01,035 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:01,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 20 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:14:01,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-12 00:14:01,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-11-12 00:14:01,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.21875) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:14:01,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2023-11-12 00:14:01,041 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 17 [2023-11-12 00:14:01,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:01,042 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2023-11-12 00:14:01,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:14:01,042 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2023-11-12 00:14:01,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:14:01,043 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:01,043 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1] [2023-11-12 00:14:01,053 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-12 00:14:01,248 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:14:01,249 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:01,249 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:01,249 INFO L85 PathProgramCache]: Analyzing trace with hash -1221701863, now seen corresponding path program 1 times [2023-11-12 00:14:01,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:01,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595929123] [2023-11-12 00:14:01,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:01,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:01,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:01,391 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:14:01,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:01,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595929123] [2023-11-12 00:14:01,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1595929123] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:01,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870612218] [2023-11-12 00:14:01,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:01,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:01,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:01,393 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:01,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:14:01,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:01,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:14:01,489 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:01,603 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:14:01,603 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:01,754 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:14:01,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870612218] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:01,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802764576] [2023-11-12 00:14:01,759 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:01,760 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:01,760 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:01,760 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:01,760 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:02,101 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:02,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1381#(and (<= 1 |#StackHeapBarrier|) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= (select |#length| ~b~0.base) (+ 7 (* |ULTIMATE.start_foo_~i~0#1| 4))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:02,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:02,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:02,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2023-11-12 00:14:02,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640990449] [2023-11-12 00:14:02,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:02,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-12 00:14:02,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:02,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-12 00:14:02,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=534, Unknown=0, NotChecked=0, Total=812 [2023-11-12 00:14:02,415 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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 00:14:02,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:02,782 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2023-11-12 00:14:02,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-12 00:14:02,783 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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) Word has length 19 [2023-11-12 00:14:02,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:02,785 INFO L225 Difference]: With dead ends: 84 [2023-11-12 00:14:02,785 INFO L226 Difference]: Without dead ends: 84 [2023-11-12 00:14:02,786 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=412, Invalid=848, Unknown=0, NotChecked=0, Total=1260 [2023-11-12 00:14:02,787 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 125 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:02,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 78 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:14:02,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-12 00:14:02,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 61. [2023-11-12 00:14:02,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 60 states have internal predecessors, (67), 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 00:14:02,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2023-11-12 00:14:02,804 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 19 [2023-11-12 00:14:02,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:02,804 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2023-11-12 00:14:02,805 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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 00:14:02,805 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2023-11-12 00:14:02,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-12 00:14:02,807 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:02,807 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 2, 1, 1, 1, 1, 1] [2023-11-12 00:14:02,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-12 00:14:03,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:14:03,015 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:03,015 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:03,016 INFO L85 PathProgramCache]: Analyzing trace with hash -2074921727, now seen corresponding path program 2 times [2023-11-12 00:14:03,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:03,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141460115] [2023-11-12 00:14:03,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:03,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:03,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:03,498 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-12 00:14:03,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:03,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141460115] [2023-11-12 00:14:03,499 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141460115] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:03,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390090657] [2023-11-12 00:14:03,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:03,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:03,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:03,502 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:03,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:14:03,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:14:03,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:03,626 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-12 00:14:03,637 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:03,663 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 00:14:03,679 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:14:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2023-11-12 00:14:04,637 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:05,158 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2023-11-12 00:14:05,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390090657] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:05,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826804071] [2023-11-12 00:14:05,164 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:05,164 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:05,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:05,165 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:05,165 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:05,556 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:06,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1774#(and (<= 1 |#StackHeapBarrier|) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= (select |#length| ~b~0.base) (+ 7 (* |ULTIMATE.start_foo_~i~0#1| 4))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:06,025 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:06,025 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:06,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 4, 4] total 25 [2023-11-12 00:14:06,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026580077] [2023-11-12 00:14:06,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:06,026 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-12 00:14:06,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:06,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-12 00:14:06,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=670, Unknown=0, NotChecked=0, Total=870 [2023-11-12 00:14:06,028 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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 00:14:08,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:08,587 INFO L93 Difference]: Finished difference Result 92 states and 101 transitions. [2023-11-12 00:14:08,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-12 00:14:08,588 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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 00:14:08,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:08,589 INFO L225 Difference]: With dead ends: 92 [2023-11-12 00:14:08,589 INFO L226 Difference]: Without dead ends: 92 [2023-11-12 00:14:08,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1024, Invalid=2758, Unknown=0, NotChecked=0, Total=3782 [2023-11-12 00:14:08,592 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 272 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:08,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 20 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:14:08,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-12 00:14:08,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 63. [2023-11-12 00:14:08,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.1379310344827587) internal successors, (66), 62 states have internal predecessors, (66), 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 00:14:08,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2023-11-12 00:14:08,597 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 35 [2023-11-12 00:14:08,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:08,597 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2023-11-12 00:14:08,597 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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 00:14:08,598 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2023-11-12 00:14:08,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-12 00:14:08,604 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:08,604 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 5, 4, 1, 1, 1, 1] [2023-11-12 00:14:08,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:08,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-12 00:14:08,811 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:08,812 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:08,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1783322866, now seen corresponding path program 3 times [2023-11-12 00:14:08,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:08,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726097697] [2023-11-12 00:14:08,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:08,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:08,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:09,401 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:09,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:09,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726097697] [2023-11-12 00:14:09,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726097697] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:09,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675974241] [2023-11-12 00:14:09,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:14:09,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:09,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:09,406 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:09,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:14:09,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:14:09,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:09,815 INFO L262 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-12 00:14:09,818 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:10,306 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:10,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:10,926 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:10,926 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675974241] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:10,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1903442498] [2023-11-12 00:14:10,929 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:10,930 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:10,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:10,930 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:10,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:11,456 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:11,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2301#(and (or (< (+ ~b~0.offset (* |ULTIMATE.start_foo_~i~0#1| 4)) 0) (< (select |#length| ~b~0.base) (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:11,957 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:11,958 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:11,958 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 51 [2023-11-12 00:14:11,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49321559] [2023-11-12 00:14:11,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:11,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-11-12 00:14:11,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:11,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-11-12 00:14:11,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1184, Invalid=2122, Unknown=0, NotChecked=0, Total=3306 [2023-11-12 00:14:11,965 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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 00:14:13,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:13,140 INFO L93 Difference]: Finished difference Result 171 states and 187 transitions. [2023-11-12 00:14:13,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-12 00:14:13,141 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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 43 [2023-11-12 00:14:13,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:13,147 INFO L225 Difference]: With dead ends: 171 [2023-11-12 00:14:13,147 INFO L226 Difference]: Without dead ends: 171 [2023-11-12 00:14:13,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2065 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1777, Invalid=3625, Unknown=0, NotChecked=0, Total=5402 [2023-11-12 00:14:13,152 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 298 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 298 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:13,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [298 Valid, 104 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:14:13,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-11-12 00:14:13,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 115. [2023-11-12 00:14:13,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.1545454545454545) internal successors, (127), 114 states have internal predecessors, (127), 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 00:14:13,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 127 transitions. [2023-11-12 00:14:13,165 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 127 transitions. Word has length 43 [2023-11-12 00:14:13,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:13,165 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 127 transitions. [2023-11-12 00:14:13,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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 00:14:13,166 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 127 transitions. [2023-11-12 00:14:13,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-11-12 00:14:13,169 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:13,169 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 5, 4, 1, 1, 1, 1] [2023-11-12 00:14:13,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:13,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-12 00:14:13,377 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:13,378 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:13,378 INFO L85 PathProgramCache]: Analyzing trace with hash -390223877, now seen corresponding path program 4 times [2023-11-12 00:14:13,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:13,378 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094255183] [2023-11-12 00:14:13,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:13,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:13,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:15,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:15,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:15,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094255183] [2023-11-12 00:14:15,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1094255183] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:15,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446580] [2023-11-12 00:14:15,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:14:15,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:15,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:15,301 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:15,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:14:15,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:15,507 INFO L262 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-12 00:14:15,523 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:16,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:16,775 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:19,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1044 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:19,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446580] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:19,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872886734] [2023-11-12 00:14:19,138 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:19,138 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:19,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:19,139 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:19,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:19,617 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:20,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3184#(and (or (< (+ ~b~0.offset (* |ULTIMATE.start_foo_~i~0#1| 4)) 0) (< (select |#length| ~b~0.base) (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:20,164 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:20,164 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:20,164 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 102 [2023-11-12 00:14:20,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146109523] [2023-11-12 00:14:20,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:20,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2023-11-12 00:14:20,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:20,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2023-11-12 00:14:20,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4652, Invalid=7120, Unknown=0, NotChecked=0, Total=11772 [2023-11-12 00:14:20,174 INFO L87 Difference]: Start difference. First operand 115 states and 127 transitions. Second operand has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 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 00:14:23,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:23,741 INFO L93 Difference]: Finished difference Result 341 states and 374 transitions. [2023-11-12 00:14:23,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2023-11-12 00:14:23,742 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 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 77 [2023-11-12 00:14:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:23,745 INFO L225 Difference]: With dead ends: 341 [2023-11-12 00:14:23,745 INFO L226 Difference]: Without dead ends: 341 [2023-11-12 00:14:23,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7624 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=6996, Invalid=13026, Unknown=0, NotChecked=0, Total=20022 [2023-11-12 00:14:23,755 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 936 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 936 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:23,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [936 Valid, 52 Invalid, 718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-12 00:14:23,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2023-11-12 00:14:23,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 217. [2023-11-12 00:14:23,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 212 states have (on average 1.1603773584905661) internal successors, (246), 216 states have internal predecessors, (246), 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 00:14:23,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 246 transitions. [2023-11-12 00:14:23,766 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 246 transitions. Word has length 77 [2023-11-12 00:14:23,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:23,767 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 246 transitions. [2023-11-12 00:14:23,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 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 00:14:23,768 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 246 transitions. [2023-11-12 00:14:23,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-11-12 00:14:23,774 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:23,774 INFO L195 NwaCegarLoop]: trace histogram [66, 66, 5, 4, 1, 1, 1, 1] [2023-11-12 00:14:23,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:23,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:23,983 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-12 00:14:23,983 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:23,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1220868075, now seen corresponding path program 5 times [2023-11-12 00:14:23,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:23,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985802986] [2023-11-12 00:14:23,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:23,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:24,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:29,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 0 proven. 4356 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-12 00:14:29,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:29,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985802986] [2023-11-12 00:14:29,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985802986] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:29,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105738157] [2023-11-12 00:14:29,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:29,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:29,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:29,910 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:29,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d0857323-a09e-4faf-9973-a0218f7ecfb5/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:14:30,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:14:30,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:30,088 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-12 00:14:30,109 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:30,130 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:14:30,140 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 00:14:30,154 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 00:14:33,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 8 proven. 66 refuted. 0 times theorem prover too weak. 4302 trivial. 0 not checked. [2023-11-12 00:14:33,551 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:35,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4376 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 4302 trivial. 0 not checked. [2023-11-12 00:14:35,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105738157] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:35,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1912636319] [2023-11-12 00:14:35,385 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:14:35,385 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:35,385 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:35,386 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:35,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:35,663 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:36,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4758#(and (<= 1 |#StackHeapBarrier|) (= ~n~0 128) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= (select |#length| ~b~0.base) (+ 7 (* |ULTIMATE.start_foo_~i~0#1| 4))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-12 00:14:36,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:36,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:36,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 5, 5] total 79 [2023-11-12 00:14:36,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132885248] [2023-11-12 00:14:36,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:36,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2023-11-12 00:14:36,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:36,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2023-11-12 00:14:36,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2478, Invalid=4494, Unknown=0, NotChecked=0, Total=6972 [2023-11-12 00:14:36,724 INFO L87 Difference]: Start difference. First operand 217 states and 246 transitions. Second operand has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 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)