./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i --full-output --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --witnessprinter.yaml.format.version 2.1 --witnessprinter.generate.graphml.witnesses false --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e378df2c Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/automizer/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/automizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/automizer/data -tc /storage/repos/certificate-witnesses-artifact/automizer/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i -s /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/certificate-witnesses-artifact/automizer --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 07d2bb25a1c8c4ef92611e8b25e211f661495bf054d1380ec62ffea892b45c2f --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --witnessprinter.yaml.format.version 2.1 --witnessprinter.generate.graphml.witnesses false --- Real Ultimate output --- This is Ultimate 0.2.5-wip.dk.contract-modifies-e378df2-m [2024-10-15 15:19:21,854 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-15 15:19:21,912 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-10-15 15:19:21,917 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-15 15:19:21,917 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-15 15:19:21,938 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-15 15:19:21,939 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-15 15:19:21,939 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-15 15:19:21,940 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-10-15 15:19:21,943 INFO L153 SettingsManager]: * Use memory slicer=true [2024-10-15 15:19:21,943 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-15 15:19:21,943 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-15 15:19:21,943 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-15 15:19:21,944 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-15 15:19:21,944 INFO L153 SettingsManager]: * Use SBE=true [2024-10-15 15:19:21,944 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-15 15:19:21,944 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-15 15:19:21,944 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-15 15:19:21,946 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-15 15:19:21,946 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-15 15:19:21,946 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-15 15:19:21,947 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-15 15:19:21,947 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-15 15:19:21,947 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-15 15:19:21,947 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-15 15:19:21,947 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-15 15:19:21,948 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-15 15:19:21,948 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-15 15:19:21,948 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-15 15:19:21,948 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-15 15:19:21,949 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-10-15 15:19:21,949 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-15 15:19:21,949 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-15 15:19:21,950 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-15 15:19:21,950 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-15 15:19:21,950 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-15 15:19:21,950 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-15 15:19:21,950 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-15 15:19:21,950 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-15 15:19:21,951 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-15 15:19:21,951 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-15 15:19:21,951 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-15 15:19:21,951 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/certificate-witnesses-artifact/automizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/certificate-witnesses-artifact/automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 07d2bb25a1c8c4ef92611e8b25e211f661495bf054d1380ec62ffea892b45c2f Applying setting for plugin de.uni_freiburg.informatik.ultimate.boogie.procedureinliner: Inline calls to implemented procedures -> NEVER Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> All Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: YAML Format version -> 2.1 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Generate GraphML witnesses -> false [2024-10-15 15:19:22,133 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-15 15:19:22,154 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-15 15:19:22,157 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-15 15:19:22,158 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-15 15:19:22,158 INFO L274 PluginConnector]: CDTParser initialized [2024-10-15 15:19:22,159 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/automizer/../sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i [2024-10-15 15:19:23,401 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-15 15:19:23,537 INFO L384 CDTParser]: Found 1 translation units. [2024-10-15 15:19:23,538 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i [2024-10-15 15:19:23,543 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/automizer/data/f1e5148ce/c9785a31f0e64633a75511d15dd2d456/FLAG086c6f68c [2024-10-15 15:19:23,553 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/automizer/data/f1e5148ce/c9785a31f0e64633a75511d15dd2d456 [2024-10-15 15:19:23,555 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-15 15:19:23,556 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-15 15:19:23,557 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-15 15:19:23,557 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-15 15:19:23,561 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-15 15:19:23,562 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,563 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@65e3f9f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23, skipping insertion in model container [2024-10-15 15:19:23,563 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,578 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-15 15:19:23,713 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i[1567,1580] [2024-10-15 15:19:23,724 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-15 15:19:23,731 INFO L200 MainTranslator]: Completed pre-run [2024-10-15 15:19:23,740 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin2.i[1567,1580] [2024-10-15 15:19:23,745 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-15 15:19:23,757 INFO L204 MainTranslator]: Completed translation [2024-10-15 15:19:23,757 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23 WrapperNode [2024-10-15 15:19:23,758 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-15 15:19:23,758 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-15 15:19:23,759 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-15 15:19:23,759 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-15 15:19:23,764 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,769 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,775 INFO L138 Inliner]: procedures = 19, calls = 59, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2024-10-15 15:19:23,775 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-15 15:19:23,775 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-15 15:19:23,775 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-15 15:19:23,776 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-15 15:19:23,783 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,783 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,785 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,815 INFO L175 MemorySlicer]: Split 34 memory accesses to 6 slices as follows [2, 3, 7, 4, 7, 11]. 32 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0, 0]. The 10 writes are split as follows [0, 1, 3, 1, 2, 3]. [2024-10-15 15:19:23,816 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,816 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,821 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,823 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,826 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,827 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,829 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-15 15:19:23,829 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-15 15:19:23,830 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-15 15:19:23,830 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-15 15:19:23,830 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (1/1) ... [2024-10-15 15:19:23,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-15 15:19:23,844 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:23,872 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-10-15 15:19:23,878 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-10-15 15:19:23,914 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-15 15:19:23,915 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_33_to_35_0 [2024-10-15 15:19:23,915 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_33_to_35_0 [2024-10-15 15:19:23,915 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-10-15 15:19:23,915 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-10-15 15:19:23,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-10-15 15:19:23,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-10-15 15:19:23,917 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-10-15 15:19:23,917 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#5 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-10-15 15:19:23,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-10-15 15:19:23,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-10-15 15:19:23,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#5 [2024-10-15 15:19:23,919 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-10-15 15:19:23,919 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-10-15 15:19:23,919 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_37_to_44_0 [2024-10-15 15:19:23,920 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_37_to_44_0 [2024-10-15 15:19:23,920 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-15 15:19:23,920 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-15 15:19:23,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#5 [2024-10-15 15:19:23,921 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-10-15 15:19:23,921 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-10-15 15:19:23,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-10-15 15:19:24,022 INFO L238 CfgBuilder]: Building ICFG [2024-10-15 15:19:24,024 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-15 15:19:24,255 INFO L? ?]: Removed 7 outVars from TransFormulas that were not future-live. [2024-10-15 15:19:24,255 INFO L287 CfgBuilder]: Performing block encoding [2024-10-15 15:19:24,271 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-15 15:19:24,271 INFO L314 CfgBuilder]: Removed 2 assume(true) statements. [2024-10-15 15:19:24,272 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:19:24 BoogieIcfgContainer [2024-10-15 15:19:24,272 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-15 15:19:24,273 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-15 15:19:24,273 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-15 15:19:24,276 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-15 15:19:24,276 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:19:23" (1/3) ... [2024-10-15 15:19:24,276 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb4c997 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:19:24, skipping insertion in model container [2024-10-15 15:19:24,276 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:19:23" (2/3) ... [2024-10-15 15:19:24,277 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cb4c997 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:19:24, skipping insertion in model container [2024-10-15 15:19:24,277 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:19:24" (3/3) ... [2024-10-15 15:19:24,277 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_divbin2.i [2024-10-15 15:19:24,289 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:All NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-15 15:19:24,289 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-10-15 15:19:24,326 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-15 15:19:24,330 INFO L333 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, mAutomataTypeConcurrency=PETRI_NET, 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;@480d393c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-15 15:19:24,330 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-10-15 15:19:24,333 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 22 states have internal predecessors, (26), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2024-10-15 15:19:24,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-10-15 15:19:24,339 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:24,340 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:24,340 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:24,344 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:24,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1751035744, now seen corresponding path program 1 times [2024-10-15 15:19:24,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:24,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284178422] [2024-10-15 15:19:24,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:24,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:24,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:24,538 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:24,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:24,558 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:24,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:24,568 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-15 15:19:24,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:24,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284178422] [2024-10-15 15:19:24,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284178422] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-15 15:19:24,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-15 15:19:24,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-10-15 15:19:24,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087390851] [2024-10-15 15:19:24,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-15 15:19:24,574 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-15 15:19:24,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:24,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-15 15:19:24,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-15 15:19:24,592 INFO L87 Difference]: Start difference. First operand has 34 states, 19 states have (on average 1.368421052631579) internal successors, (26), 22 states have internal predecessors, (26), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-15 15:19:24,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:24,678 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2024-10-15 15:19:24,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-15 15:19:24,681 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2024-10-15 15:19:24,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:24,687 INFO L225 Difference]: With dead ends: 62 [2024-10-15 15:19:24,687 INFO L226 Difference]: Without dead ends: 34 [2024-10-15 15:19:24,689 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-15 15:19:24,692 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:24,692 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 30 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-15 15:19:24,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2024-10-15 15:19:24,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2024-10-15 15:19:24,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 20 states have internal predecessors, (21), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-15 15:19:24,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2024-10-15 15:19:24,739 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 17 [2024-10-15 15:19:24,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:24,739 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2024-10-15 15:19:24,739 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2024-10-15 15:19:24,740 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:24,740 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2024-10-15 15:19:24,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-10-15 15:19:24,741 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:24,741 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:24,741 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-15 15:19:24,742 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:24,742 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:24,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1433330127, now seen corresponding path program 1 times [2024-10-15 15:19:24,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:24,742 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312397337] [2024-10-15 15:19:24,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:24,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:24,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:19:24,825 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [300819813] [2024-10-15 15:19:24,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:24,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:24,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:24,829 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:24,830 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-10-15 15:19:24,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:24,984 INFO L255 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 76 conjuncts are in the unsatisfiable core [2024-10-15 15:19:24,995 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:25,034 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:25,039 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:25,044 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:25,049 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:25,418 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:25,418 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 30 [2024-10-15 15:19:25,430 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:25,431 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 36 [2024-10-15 15:19:25,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-15 15:19:25,511 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-10-15 15:19:25,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:25,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312397337] [2024-10-15 15:19:25,512 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:19:25,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300819813] [2024-10-15 15:19:25,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300819813] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-15 15:19:25,512 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-15 15:19:25,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2024-10-15 15:19:25,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119994953] [2024-10-15 15:19:25,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-15 15:19:25,513 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-10-15 15:19:25,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:25,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-10-15 15:19:25,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2024-10-15 15:19:25,517 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 13 states, 10 states have (on average 1.1) internal successors, (11), 9 states have internal predecessors, (11), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-15 15:19:26,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:26,063 INFO L93 Difference]: Finished difference Result 54 states and 66 transitions. [2024-10-15 15:19:26,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-10-15 15:19:26,064 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.1) internal successors, (11), 9 states have internal predecessors, (11), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2024-10-15 15:19:26,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:26,066 INFO L225 Difference]: With dead ends: 54 [2024-10-15 15:19:26,066 INFO L226 Difference]: Without dead ends: 52 [2024-10-15 15:19:26,066 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2024-10-15 15:19:26,067 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:26,067 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 162 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-10-15 15:19:26,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2024-10-15 15:19:26,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2024-10-15 15:19:26,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 35 states have internal predecessors, (38), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (14), 9 states have call predecessors, (14), 9 states have call successors, (14) [2024-10-15 15:19:26,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2024-10-15 15:19:26,083 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 18 [2024-10-15 15:19:26,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:26,084 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2024-10-15 15:19:26,084 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.1) internal successors, (11), 9 states have internal predecessors, (11), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-10-15 15:19:26,084 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:26,084 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2024-10-15 15:19:26,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-10-15 15:19:26,085 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:26,085 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:26,099 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-10-15 15:19:26,286 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:26,286 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:26,286 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:26,287 INFO L85 PathProgramCache]: Analyzing trace with hash -852431656, now seen corresponding path program 1 times [2024-10-15 15:19:26,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:26,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129697749] [2024-10-15 15:19:26,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:26,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:26,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:19:26,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [101329390] [2024-10-15 15:19:26,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:26,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:26,331 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:26,332 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:26,333 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-10-15 15:19:26,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:26,447 INFO L255 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 57 conjuncts are in the unsatisfiable core [2024-10-15 15:19:26,449 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:26,455 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:26,457 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:26,460 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:26,587 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2024-10-15 15:19:26,590 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2024-10-15 15:19:26,620 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-15 15:19:26,620 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:26,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:26,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129697749] [2024-10-15 15:19:26,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:19:26,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101329390] [2024-10-15 15:19:26,989 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101329390] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:26,989 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:19:26,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2024-10-15 15:19:26,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386829926] [2024-10-15 15:19:26,989 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:26,989 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-10-15 15:19:26,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:26,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-10-15 15:19:26,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2024-10-15 15:19:26,990 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-15 15:19:27,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:27,224 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2024-10-15 15:19:27,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-10-15 15:19:27,224 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 24 [2024-10-15 15:19:27,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:27,226 INFO L225 Difference]: With dead ends: 79 [2024-10-15 15:19:27,226 INFO L226 Difference]: Without dead ends: 75 [2024-10-15 15:19:27,226 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2024-10-15 15:19:27,227 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 34 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:27,227 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 155 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-15 15:19:27,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2024-10-15 15:19:27,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 52. [2024-10-15 15:19:27,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 33 states have (on average 1.2121212121212122) internal successors, (40), 36 states have internal predecessors, (40), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (11), 9 states have call predecessors, (11), 8 states have call successors, (11) [2024-10-15 15:19:27,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2024-10-15 15:19:27,240 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 24 [2024-10-15 15:19:27,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:27,240 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2024-10-15 15:19:27,240 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-10-15 15:19:27,240 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:27,241 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2024-10-15 15:19:27,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-10-15 15:19:27,241 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:27,241 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:27,248 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-10-15 15:19:27,445 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:27,446 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:27,446 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:27,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1475040199, now seen corresponding path program 1 times [2024-10-15 15:19:27,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:27,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792298086] [2024-10-15 15:19:27,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:27,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:27,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:19:27,485 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [580643729] [2024-10-15 15:19:27,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:27,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:27,486 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:27,487 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:27,488 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-10-15 15:19:27,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:27,822 INFO L255 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 90 conjuncts are in the unsatisfiable core [2024-10-15 15:19:27,824 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:27,832 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:27,837 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:27,845 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:27,849 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:28,047 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:28,048 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 32 [2024-10-15 15:19:28,470 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:28,471 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 59 [2024-10-15 15:19:28,486 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:28,487 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 48 [2024-10-15 15:19:28,554 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-10-15 15:19:28,554 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:29,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:29,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792298086] [2024-10-15 15:19:29,632 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:19:29,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580643729] [2024-10-15 15:19:29,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580643729] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:29,632 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:19:29,632 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2024-10-15 15:19:29,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639411305] [2024-10-15 15:19:29,633 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:29,633 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-10-15 15:19:29,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:29,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-10-15 15:19:29,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=475, Unknown=0, NotChecked=0, Total=552 [2024-10-15 15:19:29,634 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 18 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-15 15:19:30,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:30,487 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2024-10-15 15:19:30,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-10-15 15:19:30,488 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 28 [2024-10-15 15:19:30,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:30,489 INFO L225 Difference]: With dead ends: 102 [2024-10-15 15:19:30,489 INFO L226 Difference]: Without dead ends: 50 [2024-10-15 15:19:30,489 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2024-10-15 15:19:30,490 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 24 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:30,490 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 166 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-10-15 15:19:30,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2024-10-15 15:19:30,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2024-10-15 15:19:30,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 11 states have call successors, (11), 9 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 8 states have call successors, (10) [2024-10-15 15:19:30,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 59 transitions. [2024-10-15 15:19:30,499 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 59 transitions. Word has length 28 [2024-10-15 15:19:30,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:30,499 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 59 transitions. [2024-10-15 15:19:30,499 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 1.2) internal successors, (18), 13 states have internal predecessors, (18), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-15 15:19:30,500 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:30,500 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 59 transitions. [2024-10-15 15:19:30,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-10-15 15:19:30,500 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:30,500 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:30,507 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-10-15 15:19:30,701 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:30,701 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:30,702 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:30,702 INFO L85 PathProgramCache]: Analyzing trace with hash 2029753888, now seen corresponding path program 1 times [2024-10-15 15:19:30,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:30,702 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713638730] [2024-10-15 15:19:30,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:30,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:30,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,121 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:31,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,127 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:31,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,238 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:31,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,261 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2024-10-15 15:19:31,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,385 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-10-15 15:19:31,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,399 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-15 15:19:31,399 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:31,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713638730] [2024-10-15 15:19:31,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713638730] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:31,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544971086] [2024-10-15 15:19:31,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:31,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:31,401 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:31,402 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:31,403 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-10-15 15:19:31,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:31,480 INFO L255 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 54 conjuncts are in the unsatisfiable core [2024-10-15 15:19:31,482 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:31,485 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:31,492 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:31,620 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:31,778 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-15 15:19:31,778 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:32,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544971086] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:32,206 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-15 15:19:32,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2024-10-15 15:19:32,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126296845] [2024-10-15 15:19:32,207 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:32,207 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-10-15 15:19:32,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:32,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-10-15 15:19:32,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=599, Unknown=0, NotChecked=0, Total=702 [2024-10-15 15:19:32,208 INFO L87 Difference]: Start difference. First operand 50 states and 59 transitions. Second operand has 20 states, 16 states have (on average 2.375) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (11), 6 states have call predecessors, (11), 8 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2024-10-15 15:19:32,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:32,679 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2024-10-15 15:19:32,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-10-15 15:19:32,679 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (11), 6 states have call predecessors, (11), 8 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 34 [2024-10-15 15:19:32,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:32,680 INFO L225 Difference]: With dead ends: 65 [2024-10-15 15:19:32,680 INFO L226 Difference]: Without dead ends: 59 [2024-10-15 15:19:32,681 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=937, Unknown=0, NotChecked=0, Total=1122 [2024-10-15 15:19:32,681 INFO L432 NwaCegarLoop]: 15 mSDtfsCounter, 49 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:32,681 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 65 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-10-15 15:19:32,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-10-15 15:19:32,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2024-10-15 15:19:32,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 38 states have internal predecessors, (42), 12 states have call successors, (12), 9 states have call predecessors, (12), 10 states have return successors, (18), 11 states have call predecessors, (18), 9 states have call successors, (18) [2024-10-15 15:19:32,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2024-10-15 15:19:32,695 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 34 [2024-10-15 15:19:32,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:32,696 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2024-10-15 15:19:32,696 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 2.375) internal successors, (38), 18 states have internal predecessors, (38), 8 states have call successors, (11), 6 states have call predecessors, (11), 8 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2024-10-15 15:19:32,697 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:32,697 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2024-10-15 15:19:32,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2024-10-15 15:19:32,698 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:32,699 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:32,712 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-10-15 15:19:32,902 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:32,903 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:32,903 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:32,903 INFO L85 PathProgramCache]: Analyzing trace with hash 207588481, now seen corresponding path program 1 times [2024-10-15 15:19:32,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:32,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714210930] [2024-10-15 15:19:32,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:32,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:32,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:19:32,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170777647] [2024-10-15 15:19:32,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:32,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:32,974 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:32,977 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:32,979 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-10-15 15:19:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:33,142 INFO L255 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-10-15 15:19:33,145 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:33,149 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:33,153 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:33,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:33,269 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:33,280 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:33,310 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:33,314 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 21 [2024-10-15 15:19:33,383 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 39 treesize of output 23 [2024-10-15 15:19:33,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 45 treesize of output 29 [2024-10-15 15:19:33,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 17 treesize of output 9 [2024-10-15 15:19:33,431 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-10-15 15:19:33,431 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:33,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 32 treesize of output 28 [2024-10-15 15:19:33,801 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:33,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714210930] [2024-10-15 15:19:33,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:19:33,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170777647] [2024-10-15 15:19:33,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170777647] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:33,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:19:33,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2024-10-15 15:19:33,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442706675] [2024-10-15 15:19:33,802 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:33,802 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-10-15 15:19:33,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:33,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-10-15 15:19:33,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2024-10-15 15:19:33,803 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-15 15:19:34,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:34,114 INFO L93 Difference]: Finished difference Result 80 states and 98 transitions. [2024-10-15 15:19:34,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-10-15 15:19:34,114 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 35 [2024-10-15 15:19:34,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:34,116 INFO L225 Difference]: With dead ends: 80 [2024-10-15 15:19:34,117 INFO L226 Difference]: Without dead ends: 78 [2024-10-15 15:19:34,117 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2024-10-15 15:19:34,118 INFO L432 NwaCegarLoop]: 33 mSDtfsCounter, 34 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:34,119 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 228 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-15 15:19:34,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2024-10-15 15:19:34,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2024-10-15 15:19:34,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 48 states have internal predecessors, (52), 14 states have call successors, (14), 11 states have call predecessors, (14), 13 states have return successors, (24), 13 states have call predecessors, (24), 11 states have call successors, (24) [2024-10-15 15:19:34,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2024-10-15 15:19:34,148 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 35 [2024-10-15 15:19:34,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:34,148 INFO L471 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2024-10-15 15:19:34,149 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (8), 5 states have call predecessors, (8), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-15 15:19:34,149 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:34,149 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2024-10-15 15:19:34,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-10-15 15:19:34,152 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:34,152 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:34,163 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-10-15 15:19:34,352 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-10-15 15:19:34,353 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:34,353 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:34,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1489727111, now seen corresponding path program 2 times [2024-10-15 15:19:34,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:34,353 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641861223] [2024-10-15 15:19:34,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:34,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:34,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:34,717 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:34,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:34,723 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:34,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:34,874 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:34,977 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:34,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:35,001 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2024-10-15 15:19:35,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:35,092 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-10-15 15:19:35,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:35,097 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-10-15 15:19:35,097 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:35,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641861223] [2024-10-15 15:19:35,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641861223] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:35,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968010465] [2024-10-15 15:19:35,098 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-15 15:19:35,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:35,098 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:35,099 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:35,100 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-10-15 15:19:35,186 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-15 15:19:35,186 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:19:35,189 INFO L255 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 119 conjuncts are in the unsatisfiable core [2024-10-15 15:19:35,192 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:35,201 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:35,209 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:35,213 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:35,422 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:19:35,756 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:35,816 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:35,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 33 [2024-10-15 15:19:36,215 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-10-15 15:19:36,215 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:37,349 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968010465] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:37,349 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-15 15:19:37,349 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 31 [2024-10-15 15:19:37,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645489842] [2024-10-15 15:19:37,350 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:37,350 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2024-10-15 15:19:37,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:37,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2024-10-15 15:19:37,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1331, Unknown=0, NotChecked=0, Total=1482 [2024-10-15 15:19:37,351 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand has 31 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 26 states have internal predecessors, (45), 12 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2024-10-15 15:19:39,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:39,252 INFO L93 Difference]: Finished difference Result 157 states and 186 transitions. [2024-10-15 15:19:39,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2024-10-15 15:19:39,253 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 26 states have internal predecessors, (45), 12 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) Word has length 40 [2024-10-15 15:19:39,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:39,254 INFO L225 Difference]: With dead ends: 157 [2024-10-15 15:19:39,254 INFO L226 Difference]: Without dead ends: 149 [2024-10-15 15:19:39,255 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 991 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=503, Invalid=3787, Unknown=0, NotChecked=0, Total=4290 [2024-10-15 15:19:39,255 INFO L432 NwaCegarLoop]: 25 mSDtfsCounter, 86 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 997 mSolverCounterSat, 43 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 1041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 997 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:39,256 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 175 Invalid, 1041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 997 Invalid, 1 Unknown, 0 Unchecked, 0.7s Time] [2024-10-15 15:19:39,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2024-10-15 15:19:39,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 139. [2024-10-15 15:19:39,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 88 states have (on average 1.1590909090909092) internal successors, (102), 94 states have internal predecessors, (102), 24 states have call successors, (24), 20 states have call predecessors, (24), 26 states have return successors, (41), 25 states have call predecessors, (41), 20 states have call successors, (41) [2024-10-15 15:19:39,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 167 transitions. [2024-10-15 15:19:39,317 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 167 transitions. Word has length 40 [2024-10-15 15:19:39,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:39,317 INFO L471 AbstractCegarLoop]: Abstraction has 139 states and 167 transitions. [2024-10-15 15:19:39,317 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 26 states have internal predecessors, (45), 12 states have call successors, (13), 7 states have call predecessors, (13), 10 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2024-10-15 15:19:39,318 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:39,318 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 167 transitions. [2024-10-15 15:19:39,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-10-15 15:19:39,321 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:39,322 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:39,334 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-10-15 15:19:39,522 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:39,522 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:39,523 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:39,523 INFO L85 PathProgramCache]: Analyzing trace with hash -108501650, now seen corresponding path program 3 times [2024-10-15 15:19:39,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:39,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219631288] [2024-10-15 15:19:39,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:39,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:39,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:39,842 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:39,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:39,845 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:39,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,013 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:40,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,142 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:40,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,242 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:40,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,265 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2024-10-15 15:19:40,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,350 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-10-15 15:19:40,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:40,354 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-10-15 15:19:40,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:40,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219631288] [2024-10-15 15:19:40,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219631288] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:40,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911904731] [2024-10-15 15:19:40,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-10-15 15:19:40,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:40,355 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:40,356 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:40,357 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-10-15 15:19:40,544 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-10-15 15:19:40,544 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:19:40,545 INFO L255 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-10-15 15:19:40,548 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:40,551 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:40,553 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:40,555 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:40,682 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:40,740 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 19 treesize of output 11 [2024-10-15 15:19:40,742 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 7 [2024-10-15 15:19:40,792 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-10-15 15:19:40,792 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-10-15 15:19:40,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911904731] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-15 15:19:40,792 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:19:40,792 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [18] total 25 [2024-10-15 15:19:40,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069117686] [2024-10-15 15:19:40,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-15 15:19:40,792 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-10-15 15:19:40,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:40,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-10-15 15:19:40,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=547, Unknown=0, NotChecked=0, Total=600 [2024-10-15 15:19:40,793 INFO L87 Difference]: Start difference. First operand 139 states and 167 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-15 15:19:41,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:41,046 INFO L93 Difference]: Finished difference Result 149 states and 176 transitions. [2024-10-15 15:19:41,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-10-15 15:19:41,047 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 46 [2024-10-15 15:19:41,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:41,048 INFO L225 Difference]: With dead ends: 149 [2024-10-15 15:19:41,048 INFO L226 Difference]: Without dead ends: 143 [2024-10-15 15:19:41,050 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=81, Invalid=789, Unknown=0, NotChecked=0, Total=870 [2024-10-15 15:19:41,050 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 41 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 17 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:41,050 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 68 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 181 Invalid, 1 Unknown, 0 Unchecked, 0.1s Time] [2024-10-15 15:19:41,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2024-10-15 15:19:41,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2024-10-15 15:19:41,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 89 states have (on average 1.1573033707865168) internal successors, (103), 95 states have internal predecessors, (103), 24 states have call successors, (24), 20 states have call predecessors, (24), 27 states have return successors, (42), 25 states have call predecessors, (42), 20 states have call successors, (42) [2024-10-15 15:19:41,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 169 transitions. [2024-10-15 15:19:41,091 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 169 transitions. Word has length 46 [2024-10-15 15:19:41,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:41,092 INFO L471 AbstractCegarLoop]: Abstraction has 141 states and 169 transitions. [2024-10-15 15:19:41,092 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-15 15:19:41,092 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:41,092 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 169 transitions. [2024-10-15 15:19:41,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2024-10-15 15:19:41,096 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:41,096 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:41,102 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-10-15 15:19:41,296 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:41,297 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:41,297 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:41,297 INFO L85 PathProgramCache]: Analyzing trace with hash -2101514835, now seen corresponding path program 1 times [2024-10-15 15:19:41,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:41,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474391179] [2024-10-15 15:19:41,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:41,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:41,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:41,669 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:41,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:41,674 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:41,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:41,861 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:41,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,002 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2024-10-15 15:19:42,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,319 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-10-15 15:19:42,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,326 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2024-10-15 15:19:42,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,350 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-10-15 15:19:42,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,352 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-10-15 15:19:42,352 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:42,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474391179] [2024-10-15 15:19:42,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474391179] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:42,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1935848560] [2024-10-15 15:19:42,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:42,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:42,353 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:42,354 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:42,355 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-10-15 15:19:42,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:42,472 INFO L255 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 101 conjuncts are in the unsatisfiable core [2024-10-15 15:19:42,474 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:42,477 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:42,480 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:42,483 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:42,641 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:19:42,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 7 treesize of output 3 [2024-10-15 15:19:42,953 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:43,372 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 25 treesize of output 17 [2024-10-15 15:19:43,376 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-15 15:19:43,376 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:43,615 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 37 treesize of output 29 [2024-10-15 15:19:44,183 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 41 treesize of output 33 [2024-10-15 15:19:44,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1935848560] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:44,558 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-15 15:19:44,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 35 [2024-10-15 15:19:44,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140798919] [2024-10-15 15:19:44,558 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:44,559 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-10-15 15:19:44,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:44,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-10-15 15:19:44,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1984, Unknown=0, NotChecked=0, Total=2162 [2024-10-15 15:19:44,560 INFO L87 Difference]: Start difference. First operand 141 states and 169 transitions. Second operand has 35 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 29 states have internal predecessors, (51), 13 states have call successors, (15), 7 states have call predecessors, (15), 8 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2024-10-15 15:19:45,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:45,905 INFO L93 Difference]: Finished difference Result 159 states and 203 transitions. [2024-10-15 15:19:45,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-10-15 15:19:45,906 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 29 states have internal predecessors, (51), 13 states have call successors, (15), 7 states have call predecessors, (15), 8 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) Word has length 47 [2024-10-15 15:19:45,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:45,907 INFO L225 Difference]: With dead ends: 159 [2024-10-15 15:19:45,907 INFO L226 Difference]: Without dead ends: 139 [2024-10-15 15:19:45,908 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 884 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=409, Invalid=3623, Unknown=0, NotChecked=0, Total=4032 [2024-10-15 15:19:45,908 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 83 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:45,909 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 78 Invalid, 829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-10-15 15:19:45,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2024-10-15 15:19:45,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 128. [2024-10-15 15:19:45,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 78 states have (on average 1.1538461538461537) internal successors, (90), 86 states have internal predecessors, (90), 24 states have call successors, (24), 17 states have call predecessors, (24), 25 states have return successors, (49), 24 states have call predecessors, (49), 21 states have call successors, (49) [2024-10-15 15:19:45,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 163 transitions. [2024-10-15 15:19:45,948 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 163 transitions. Word has length 47 [2024-10-15 15:19:45,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:45,948 INFO L471 AbstractCegarLoop]: Abstraction has 128 states and 163 transitions. [2024-10-15 15:19:45,948 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 29 states have internal predecessors, (51), 13 states have call successors, (15), 7 states have call predecessors, (15), 8 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2024-10-15 15:19:45,948 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:45,948 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 163 transitions. [2024-10-15 15:19:45,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-10-15 15:19:45,949 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:45,949 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:45,962 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-10-15 15:19:46,150 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:46,150 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:46,150 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:46,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1905411784, now seen corresponding path program 2 times [2024-10-15 15:19:46,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:46,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166074937] [2024-10-15 15:19:46,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:46,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:46,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,804 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-10-15 15:19:46,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,815 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-10-15 15:19:46,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,915 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-15 15:19:46,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,927 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2024-10-15 15:19:46,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,931 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2024-10-15 15:19:46,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:46,934 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-10-15 15:19:46,934 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:19:46,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166074937] [2024-10-15 15:19:46,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166074937] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:46,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2147438880] [2024-10-15 15:19:46,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-15 15:19:46,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:46,935 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:46,936 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:46,937 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-10-15 15:19:47,152 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-15 15:19:47,152 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:19:47,155 INFO L255 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 114 conjuncts are in the unsatisfiable core [2024-10-15 15:19:47,158 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:47,164 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:47,166 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:47,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:47,482 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 26 [2024-10-15 15:19:47,508 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:47,579 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-10-15 15:19:47,579 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:48,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2147438880] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:19:48,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-15 15:19:48,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19] total 25 [2024-10-15 15:19:48,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806593652] [2024-10-15 15:19:48,357 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-15 15:19:48,357 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-15 15:19:48,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:19:48,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-15 15:19:48,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1070, Unknown=0, NotChecked=0, Total=1190 [2024-10-15 15:19:48,358 INFO L87 Difference]: Start difference. First operand 128 states and 163 transitions. Second operand has 25 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 21 states have internal predecessors, (46), 8 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2024-10-15 15:19:49,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:19:49,255 INFO L93 Difference]: Finished difference Result 219 states and 273 transitions. [2024-10-15 15:19:49,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-10-15 15:19:49,256 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 21 states have internal predecessors, (46), 8 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 46 [2024-10-15 15:19:49,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:19:49,257 INFO L225 Difference]: With dead ends: 219 [2024-10-15 15:19:49,257 INFO L226 Difference]: Without dead ends: 158 [2024-10-15 15:19:49,258 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 64 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=279, Invalid=2271, Unknown=0, NotChecked=0, Total=2550 [2024-10-15 15:19:49,258 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 72 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 29 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-10-15 15:19:49,258 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 60 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 489 Invalid, 1 Unknown, 0 Unchecked, 0.3s Time] [2024-10-15 15:19:49,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2024-10-15 15:19:49,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 104. [2024-10-15 15:19:49,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 66 states have (on average 1.106060606060606) internal successors, (73), 70 states have internal predecessors, (73), 19 states have call successors, (19), 16 states have call predecessors, (19), 18 states have return successors, (27), 17 states have call predecessors, (27), 16 states have call successors, (27) [2024-10-15 15:19:49,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 119 transitions. [2024-10-15 15:19:49,295 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 119 transitions. Word has length 46 [2024-10-15 15:19:49,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:19:49,295 INFO L471 AbstractCegarLoop]: Abstraction has 104 states and 119 transitions. [2024-10-15 15:19:49,295 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 21 states have internal predecessors, (46), 8 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2024-10-15 15:19:49,296 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:49,296 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 119 transitions. [2024-10-15 15:19:49,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2024-10-15 15:19:49,296 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:19:49,296 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:19:49,304 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-10-15 15:19:49,496 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-10-15 15:19:49,497 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:19:49,497 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:19:49,497 INFO L85 PathProgramCache]: Analyzing trace with hash -1283866385, now seen corresponding path program 1 times [2024-10-15 15:19:49,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:19:49,497 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492586821] [2024-10-15 15:19:49,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:49,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:19:49,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:19:49,523 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [528920373] [2024-10-15 15:19:49,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:19:49,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:19:49,524 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:19:49,527 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:19:49,528 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-10-15 15:19:49,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:19:49,705 WARN L253 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 178 conjuncts are in the unsatisfiable core [2024-10-15 15:19:49,709 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:19:49,715 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:49,719 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:19:49,721 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:19:49,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:19:49,853 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:19:49,987 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:50,041 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:50,041 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 32 [2024-10-15 15:19:51,465 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:19:51,499 INFO L349 Elim1Store]: treesize reduction 18, result has 60.9 percent of original size [2024-10-15 15:19:51,500 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 56 [2024-10-15 15:19:51,544 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-15 15:19:51,544 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-15 15:19:51,689 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:51,690 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 92 treesize of output 136 [2024-10-15 15:19:51,772 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:19:51,773 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 86 treesize of output 230 [2024-10-15 15:19:52,767 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-10-15 15:19:52,767 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:19:59,665 WARN L286 SmtUtils]: Spent 6.53s on a formula simplification that was a NOOP. DAG size: 138 (called from [L 275] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2024-10-15 15:20:07,548 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((|v_func_to_recursive_line_37_to_44_0_#in~b.base_BEFORE_CALL_13| Int) (|v_func_to_recursive_line_37_to_44_0_#in~r.base_BEFORE_CALL_8| Int) (|v_func_to_recursive_line_37_to_44_0_#in~b.offset_BEFORE_CALL_13| Int) (|v_func_to_recursive_line_37_to_44_0_#in~A.offset_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~q.base_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~q.offset_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~r.offset_BEFORE_CALL_8| Int) (|v_func_to_recursive_line_37_to_44_0_#in~A.base_BEFORE_CALL_4| Int)) (let ((.cse0 (mod (select (select |c_#memory_int#3| |v_func_to_recursive_line_37_to_44_0_#in~A.base_BEFORE_CALL_4|) |v_func_to_recursive_line_37_to_44_0_#in~A.offset_BEFORE_CALL_4|) 4294967296))) (or (not (= .cse0 (mod (+ (select (select |c_old(#memory_int#4)| |v_func_to_recursive_line_37_to_44_0_#in~r.base_BEFORE_CALL_8|) |v_func_to_recursive_line_37_to_44_0_#in~r.offset_BEFORE_CALL_8|) (* (select (select |c_old(#memory_int#2)| |v_func_to_recursive_line_37_to_44_0_#in~q.base_BEFORE_CALL_4|) |v_func_to_recursive_line_37_to_44_0_#in~q.offset_BEFORE_CALL_4|) (select (select |c_old(#memory_int#5)| |v_func_to_recursive_line_37_to_44_0_#in~b.base_BEFORE_CALL_13|) |v_func_to_recursive_line_37_to_44_0_#in~b.offset_BEFORE_CALL_13|))) 4294967296))) (= (mod (+ (select (select |c_#memory_int#4| |v_func_to_recursive_line_37_to_44_0_#in~r.base_BEFORE_CALL_8|) |v_func_to_recursive_line_37_to_44_0_#in~r.offset_BEFORE_CALL_8|) (* (select (select |c_#memory_int#5| |v_func_to_recursive_line_37_to_44_0_#in~b.base_BEFORE_CALL_13|) |v_func_to_recursive_line_37_to_44_0_#in~b.offset_BEFORE_CALL_13|) (select (select |c_#memory_int#2| |v_func_to_recursive_line_37_to_44_0_#in~q.base_BEFORE_CALL_4|) |v_func_to_recursive_line_37_to_44_0_#in~q.offset_BEFORE_CALL_4|))) 4294967296) .cse0)))) (or (= (mod (+ (select (select |c_old(#memory_int#4)| |c_func_to_recursive_line_37_to_44_0_#in~r.base|) |c_func_to_recursive_line_37_to_44_0_#in~r.offset|) (* (select (select |c_old(#memory_int#2)| |c_func_to_recursive_line_37_to_44_0_#in~q.base|) |c_func_to_recursive_line_37_to_44_0_#in~q.offset|) (select (select |c_old(#memory_int#5)| |c_func_to_recursive_line_37_to_44_0_#in~b.base|) |c_func_to_recursive_line_37_to_44_0_#in~b.offset|))) 4294967296) (mod (select (select |c_#memory_int#3| |c_func_to_recursive_line_37_to_44_0_#in~A.base|) |c_func_to_recursive_line_37_to_44_0_#in~A.offset|) 4294967296)) (forall ((|v_func_to_recursive_line_37_to_44_0_#in~b.base_BEFORE_CALL_13| Int) (|v_func_to_recursive_line_37_to_44_0_#in~r.base_BEFORE_CALL_8| Int) (|v_func_to_recursive_line_37_to_44_0_#in~b.offset_BEFORE_CALL_13| Int) (|v_func_to_recursive_line_37_to_44_0_#in~A.offset_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~q.base_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~q.offset_BEFORE_CALL_4| Int) (|v_func_to_recursive_line_37_to_44_0_#in~r.offset_BEFORE_CALL_8| Int) (|v_func_to_recursive_line_37_to_44_0_#in~A.base_BEFORE_CALL_4| Int)) (= (mod (+ (select (select |c_#memory_int#4| |v_func_to_recursive_line_37_to_44_0_#in~r.base_BEFORE_CALL_8|) |v_func_to_recursive_line_37_to_44_0_#in~r.offset_BEFORE_CALL_8|) (* (select (select |c_#memory_int#5| |v_func_to_recursive_line_37_to_44_0_#in~b.base_BEFORE_CALL_13|) |v_func_to_recursive_line_37_to_44_0_#in~b.offset_BEFORE_CALL_13|) (select (select |c_#memory_int#2| |v_func_to_recursive_line_37_to_44_0_#in~q.base_BEFORE_CALL_4|) |v_func_to_recursive_line_37_to_44_0_#in~q.offset_BEFORE_CALL_4|))) 4294967296) (mod (select (select |c_#memory_int#3| |v_func_to_recursive_line_37_to_44_0_#in~A.base_BEFORE_CALL_4|) |v_func_to_recursive_line_37_to_44_0_#in~A.offset_BEFORE_CALL_4|) 4294967296))))) is different from false [2024-10-15 15:20:08,063 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:20:08,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492586821] [2024-10-15 15:20:08,064 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:20:08,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528920373] [2024-10-15 15:20:08,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528920373] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:20:08,064 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:20:08,064 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2024-10-15 15:20:08,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75717049] [2024-10-15 15:20:08,064 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:20:08,065 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-15 15:20:08,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:20:08,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-15 15:20:08,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=780, Unknown=1, NotChecked=56, Total=930 [2024-10-15 15:20:08,066 INFO L87 Difference]: Start difference. First operand 104 states and 119 transitions. Second operand has 25 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 8 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-15 15:20:14,893 WARN L851 $PredicateComparison]: unable to prove that (let ((.cse6 (select |c_old(#memory_int#5)| |c_func_to_recursive_line_37_to_44_0_#in~b.base|))) (let ((.cse5 (div (mod (select .cse6 |c_func_to_recursive_line_37_to_44_0_#in~b.offset|) 4294967296) 2))) (and (= (store |c_old(#memory_int#2)| c_func_to_recursive_line_37_to_44_0_~q.base (let ((.cse0 (select |c_old(#memory_int#2)| c_func_to_recursive_line_37_to_44_0_~q.base))) (store .cse0 c_func_to_recursive_line_37_to_44_0_~q.offset (+ (* (select .cse0 c_func_to_recursive_line_37_to_44_0_~q.offset) 2) 1)))) |c_#memory_int#2|) (= |c_func_to_recursive_line_37_to_44_0_#in~A.offset| c_func_to_recursive_line_37_to_44_0_~A.offset) (= c_func_to_recursive_line_37_to_44_0_~q.offset |c_func_to_recursive_line_37_to_44_0_#in~q.offset|) (exists ((|v_main_~#A~0.base_BEFORE_CALL_15| Int) (|v_main_~#A~0.offset_BEFORE_CALL_15| Int)) (= (mod (select (select |c_#memory_int#3| |v_main_~#A~0.base_BEFORE_CALL_15|) |v_main_~#A~0.offset_BEFORE_CALL_15|) 4294967296) 1)) (= (store |c_old(#memory_int#2)| |c_func_to_recursive_line_37_to_44_0_#in~q.base| (let ((.cse1 (select |c_old(#memory_int#2)| |c_func_to_recursive_line_37_to_44_0_#in~q.base|))) (store .cse1 |c_func_to_recursive_line_37_to_44_0_#in~q.offset| (+ (* (select .cse1 |c_func_to_recursive_line_37_to_44_0_#in~q.offset|) 2) 1)))) |c_#memory_int#2|) (= (store |c_old(#memory_int#5)| c_func_to_recursive_line_37_to_44_0_~b.base (let ((.cse2 (select |c_old(#memory_int#5)| c_func_to_recursive_line_37_to_44_0_~b.base))) (store .cse2 c_func_to_recursive_line_37_to_44_0_~b.offset (div (mod (select .cse2 c_func_to_recursive_line_37_to_44_0_~b.offset) 4294967296) 2)))) |c_#memory_int#5|) (= |c_func_to_recursive_line_37_to_44_0_#in~r.offset| c_func_to_recursive_line_37_to_44_0_~r.offset) (= |c_#memory_int#4| (store |c_old(#memory_int#4)| c_func_to_recursive_line_37_to_44_0_~r.base (let ((.cse3 (select |c_old(#memory_int#4)| c_func_to_recursive_line_37_to_44_0_~r.base))) (store .cse3 c_func_to_recursive_line_37_to_44_0_~r.offset (+ (* (select (select |c_#memory_int#5| c_func_to_recursive_line_37_to_44_0_~b.base) c_func_to_recursive_line_37_to_44_0_~b.offset) (- 1)) (select .cse3 c_func_to_recursive_line_37_to_44_0_~r.offset)))))) (= |c_func_to_recursive_line_37_to_44_0_#in~A.base| c_func_to_recursive_line_37_to_44_0_~A.base) (= c_func_to_recursive_line_37_to_44_0_~b.offset |c_func_to_recursive_line_37_to_44_0_#in~b.offset|) (= |c_func_to_recursive_line_37_to_44_0_#in~r.base| c_func_to_recursive_line_37_to_44_0_~r.base) (= c_func_to_recursive_line_37_to_44_0_~q.base |c_func_to_recursive_line_37_to_44_0_#in~q.base|) (= |c_func_to_recursive_line_37_to_44_0_#in~b.base| c_func_to_recursive_line_37_to_44_0_~b.base) (= (mod (+ (* (select (select |c_#memory_int#5| |c_func_to_recursive_line_37_to_44_0_#in~b.base|) |c_func_to_recursive_line_37_to_44_0_#in~b.offset|) (select (select |c_#memory_int#2| |c_func_to_recursive_line_37_to_44_0_#in~q.base|) |c_func_to_recursive_line_37_to_44_0_#in~q.offset|)) (select (select |c_#memory_int#4| |c_func_to_recursive_line_37_to_44_0_#in~r.base|) |c_func_to_recursive_line_37_to_44_0_#in~r.offset|)) 4294967296) (mod (select (select |c_#memory_int#3| |c_func_to_recursive_line_37_to_44_0_#in~A.base|) |c_func_to_recursive_line_37_to_44_0_#in~A.offset|) 4294967296)) (= (store |c_old(#memory_int#4)| |c_func_to_recursive_line_37_to_44_0_#in~r.base| (let ((.cse4 (select |c_old(#memory_int#4)| |c_func_to_recursive_line_37_to_44_0_#in~r.base|))) (store .cse4 |c_func_to_recursive_line_37_to_44_0_#in~r.offset| (+ (* (- 1) .cse5) (select .cse4 |c_func_to_recursive_line_37_to_44_0_#in~r.offset|))))) |c_#memory_int#4|) (= |c_#memory_int#5| (store |c_old(#memory_int#5)| |c_func_to_recursive_line_37_to_44_0_#in~b.base| (store .cse6 |c_func_to_recursive_line_37_to_44_0_#in~b.offset| .cse5)))))) is different from false [2024-10-15 15:20:15,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:20:15,112 INFO L93 Difference]: Finished difference Result 108 states and 123 transitions. [2024-10-15 15:20:15,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-10-15 15:20:15,112 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 8 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 47 [2024-10-15 15:20:15,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:20:15,113 INFO L225 Difference]: With dead ends: 108 [2024-10-15 15:20:15,113 INFO L226 Difference]: Without dead ends: 73 [2024-10-15 15:20:15,114 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=226, Invalid=1760, Unknown=2, NotChecked=174, Total=2162 [2024-10-15 15:20:15,114 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 26 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 14 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2024-10-15 15:20:15,114 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 196 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 556 Invalid, 2 Unknown, 23 Unchecked, 2.1s Time] [2024-10-15 15:20:15,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2024-10-15 15:20:15,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2024-10-15 15:20:15,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 48 states have internal predecessors, (50), 14 states have call successors, (14), 11 states have call predecessors, (14), 12 states have return successors, (21), 11 states have call predecessors, (21), 12 states have call successors, (21) [2024-10-15 15:20:15,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2024-10-15 15:20:15,138 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 47 [2024-10-15 15:20:15,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:20:15,138 INFO L471 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2024-10-15 15:20:15,138 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 8 states have call successors, (9), 5 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-15 15:20:15,138 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:20:15,138 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2024-10-15 15:20:15,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2024-10-15 15:20:15,139 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:20:15,139 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:20:15,146 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-10-15 15:20:15,339 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-10-15 15:20:15,339 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:20:15,340 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:20:15,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1276039393, now seen corresponding path program 3 times [2024-10-15 15:20:15,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:20:15,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689553422] [2024-10-15 15:20:15,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:20:15,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:20:15,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:20:15,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2139087801] [2024-10-15 15:20:15,414 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-10-15 15:20:15,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:20:15,415 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:20:15,416 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:20:15,417 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-10-15 15:20:15,787 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-10-15 15:20:15,787 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:20:15,792 WARN L253 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 281 conjuncts are in the unsatisfiable core [2024-10-15 15:20:15,796 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:20:15,804 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:20:15,807 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:20:15,811 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:20:15,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:20:15,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:20:15,955 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:20:16,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:16,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:16,703 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2024-10-15 15:20:16,703 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:20:16,801 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-10-15 15:20:16,802 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2024-10-15 15:20:16,831 INFO L349 Elim1Store]: treesize reduction 14, result has 58.8 percent of original size [2024-10-15 15:20:16,831 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 53 [2024-10-15 15:20:17,805 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:17,822 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:17,928 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:17,967 INFO L349 Elim1Store]: treesize reduction 36, result has 52.0 percent of original size [2024-10-15 15:20:17,967 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 108 treesize of output 110 [2024-10-15 15:20:18,584 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:20:18,585 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 160 treesize of output 296 [2024-10-15 15:20:18,658 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:20:18,659 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 234 treesize of output 298 [2024-10-15 15:20:19,217 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-10-15 15:20:19,217 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:20:42,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:20:42,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689553422] [2024-10-15 15:20:42,959 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:20:42,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139087801] [2024-10-15 15:20:42,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139087801] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:20:42,959 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:20:42,959 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2024-10-15 15:20:42,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946186080] [2024-10-15 15:20:42,959 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:20:42,960 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-10-15 15:20:42,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:20:42,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-10-15 15:20:42,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1512, Unknown=3, NotChecked=0, Total=1640 [2024-10-15 15:20:42,961 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 28 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 9 states have call successors, (11), 8 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-15 15:20:49,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:20:49,741 INFO L93 Difference]: Finished difference Result 126 states and 154 transitions. [2024-10-15 15:20:49,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-10-15 15:20:49,741 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 9 states have call successors, (11), 8 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 52 [2024-10-15 15:20:49,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:20:49,742 INFO L225 Difference]: With dead ends: 126 [2024-10-15 15:20:49,742 INFO L226 Difference]: Without dead ends: 114 [2024-10-15 15:20:49,743 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 29.0s TimeCoverageRelationStatistics Valid=213, Invalid=2333, Unknown=4, NotChecked=0, Total=2550 [2024-10-15 15:20:49,743 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 36 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 838 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 853 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2024-10-15 15:20:49,743 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 367 Invalid, 853 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 838 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2024-10-15 15:20:49,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2024-10-15 15:20:49,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2024-10-15 15:20:49,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 71 states have (on average 1.1267605633802817) internal successors, (80), 75 states have internal predecessors, (80), 20 states have call successors, (20), 17 states have call predecessors, (20), 19 states have return successors, (34), 18 states have call predecessors, (34), 18 states have call successors, (34) [2024-10-15 15:20:49,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 134 transitions. [2024-10-15 15:20:49,796 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 134 transitions. Word has length 52 [2024-10-15 15:20:49,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:20:49,797 INFO L471 AbstractCegarLoop]: Abstraction has 111 states and 134 transitions. [2024-10-15 15:20:49,797 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 9 states have call successors, (11), 8 states have call predecessors, (11), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-10-15 15:20:49,797 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:20:49,797 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 134 transitions. [2024-10-15 15:20:49,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2024-10-15 15:20:49,797 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:20:49,797 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:20:49,806 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-10-15 15:20:49,998 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:20:49,998 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:20:49,998 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:20:49,998 INFO L85 PathProgramCache]: Analyzing trace with hash -2085386019, now seen corresponding path program 1 times [2024-10-15 15:20:49,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:20:49,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049671286] [2024-10-15 15:20:49,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:20:49,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:20:50,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:20:50,040 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [801438475] [2024-10-15 15:20:50,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:20:50,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:20:50,040 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:20:50,041 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:20:50,042 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-10-15 15:20:50,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-15 15:20:50,365 WARN L253 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 260 conjuncts are in the unsatisfiable core [2024-10-15 15:20:50,369 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:20:50,373 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:20:50,376 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:20:50,379 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:20:50,383 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:20:50,386 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:20:50,557 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:20:50,634 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:20:50,940 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:51,351 INFO L349 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2024-10-15 15:20:51,351 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:20:51,369 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:51,462 INFO L349 Elim1Store]: treesize reduction 18, result has 60.9 percent of original size [2024-10-15 15:20:51,462 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 61 [2024-10-15 15:20:51,509 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-15 15:20:51,510 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-15 15:20:52,578 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:52,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:20:52,891 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:20:52,892 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 106 treesize of output 182 [2024-10-15 15:20:52,926 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:20:52,926 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 162 treesize of output 182 [2024-10-15 15:20:53,160 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-10-15 15:20:53,160 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:21:11,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:21:11,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049671286] [2024-10-15 15:21:11,355 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:21:11,355 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801438475] [2024-10-15 15:21:11,355 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801438475] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:21:11,355 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:21:11,355 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2024-10-15 15:21:11,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328016075] [2024-10-15 15:21:11,356 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:21:11,356 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-15 15:21:11,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:21:11,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-15 15:21:11,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1287, Unknown=3, NotChecked=0, Total=1406 [2024-10-15 15:21:11,357 INFO L87 Difference]: Start difference. First operand 111 states and 134 transitions. Second operand has 25 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-15 15:21:14,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:21:14,168 INFO L93 Difference]: Finished difference Result 174 states and 213 transitions. [2024-10-15 15:21:14,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-10-15 15:21:14,170 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 52 [2024-10-15 15:21:14,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:21:14,171 INFO L225 Difference]: With dead ends: 174 [2024-10-15 15:21:14,171 INFO L226 Difference]: Without dead ends: 127 [2024-10-15 15:21:14,172 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=203, Invalid=2050, Unknown=3, NotChecked=0, Total=2256 [2024-10-15 15:21:14,172 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 29 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 952 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 952 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2024-10-15 15:21:14,172 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 456 Invalid, 963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 952 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2024-10-15 15:21:14,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2024-10-15 15:21:14,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2024-10-15 15:21:14,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 79 states have (on average 1.1139240506329113) internal successors, (88), 84 states have internal predecessors, (88), 22 states have call successors, (22), 19 states have call predecessors, (22), 21 states have return successors, (38), 19 states have call predecessors, (38), 20 states have call successors, (38) [2024-10-15 15:21:14,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 148 transitions. [2024-10-15 15:21:14,231 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 148 transitions. Word has length 52 [2024-10-15 15:21:14,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:21:14,231 INFO L471 AbstractCegarLoop]: Abstraction has 123 states and 148 transitions. [2024-10-15 15:21:14,231 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 8 states have call successors, (10), 8 states have call predecessors, (10), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2024-10-15 15:21:14,232 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:21:14,232 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 148 transitions. [2024-10-15 15:21:14,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-10-15 15:21:14,232 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:21:14,232 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:21:14,240 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2024-10-15 15:21:14,432 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-10-15 15:21:14,433 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:21:14,433 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:21:14,433 INFO L85 PathProgramCache]: Analyzing trace with hash 992478086, now seen corresponding path program 4 times [2024-10-15 15:21:14,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:21:14,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943356855] [2024-10-15 15:21:14,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:21:14,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:21:14,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:21:14,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1171246129] [2024-10-15 15:21:14,495 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-10-15 15:21:14,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:21:14,495 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:21:14,497 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:21:14,497 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-10-15 15:21:14,825 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-10-15 15:21:14,825 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:21:14,829 WARN L253 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 276 conjuncts are in the unsatisfiable core [2024-10-15 15:21:14,834 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:21:14,839 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:21:14,842 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:21:14,848 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:21:14,852 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:21:15,203 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:15,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:15,582 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2024-10-15 15:21:15,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:21:15,652 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-10-15 15:21:15,652 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2024-10-15 15:21:15,676 INFO L349 Elim1Store]: treesize reduction 14, result has 58.8 percent of original size [2024-10-15 15:21:15,677 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 48 [2024-10-15 15:21:16,386 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:16,408 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:16,526 INFO L349 Elim1Store]: treesize reduction 36, result has 52.0 percent of original size [2024-10-15 15:21:16,527 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 97 treesize of output 103 [2024-10-15 15:21:16,628 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:17,051 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:21:17,051 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 160 treesize of output 296 [2024-10-15 15:21:17,131 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:21:17,132 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 225 treesize of output 293 [2024-10-15 15:21:17,572 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-10-15 15:21:17,572 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:21:34,173 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:21:34,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943356855] [2024-10-15 15:21:34,173 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:21:34,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171246129] [2024-10-15 15:21:34,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171246129] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:21:34,174 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:21:34,174 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2024-10-15 15:21:34,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158762723] [2024-10-15 15:21:34,174 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:21:34,174 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-10-15 15:21:34,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:21:34,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-10-15 15:21:34,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1220, Unknown=3, NotChecked=0, Total=1332 [2024-10-15 15:21:34,175 INFO L87 Difference]: Start difference. First operand 123 states and 148 transitions. Second operand has 25 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 19 states have internal predecessors, (32), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2024-10-15 15:21:41,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:21:41,081 INFO L93 Difference]: Finished difference Result 190 states and 230 transitions. [2024-10-15 15:21:41,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-10-15 15:21:41,081 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 19 states have internal predecessors, (32), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) Word has length 58 [2024-10-15 15:21:41,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:21:41,083 INFO L225 Difference]: With dead ends: 190 [2024-10-15 15:21:41,083 INFO L226 Difference]: Without dead ends: 186 [2024-10-15 15:21:41,083 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 21.9s TimeCoverageRelationStatistics Valid=188, Invalid=1970, Unknown=4, NotChecked=0, Total=2162 [2024-10-15 15:21:41,083 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 46 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 1082 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 523 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-10-15 15:21:41,084 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 523 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1082 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-10-15 15:21:41,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2024-10-15 15:21:41,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 171. [2024-10-15 15:21:41,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 111 states have (on average 1.117117117117117) internal successors, (124), 116 states have internal predecessors, (124), 29 states have call successors, (29), 26 states have call predecessors, (29), 30 states have return successors, (53), 28 states have call predecessors, (53), 26 states have call successors, (53) [2024-10-15 15:21:41,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 206 transitions. [2024-10-15 15:21:41,172 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 206 transitions. Word has length 58 [2024-10-15 15:21:41,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:21:41,172 INFO L471 AbstractCegarLoop]: Abstraction has 171 states and 206 transitions. [2024-10-15 15:21:41,172 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 19 states have internal predecessors, (32), 8 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (7), 7 states have call predecessors, (7), 5 states have call successors, (7) [2024-10-15 15:21:41,173 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:21:41,173 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 206 transitions. [2024-10-15 15:21:41,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-10-15 15:21:41,173 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:21:41,173 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:21:41,187 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-10-15 15:21:41,374 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-10-15 15:21:41,374 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:21:41,374 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:21:41,374 INFO L85 PathProgramCache]: Analyzing trace with hash 183131460, now seen corresponding path program 2 times [2024-10-15 15:21:41,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:21:41,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051330286] [2024-10-15 15:21:41,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:21:41,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:21:41,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:21:41,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [304735916] [2024-10-15 15:21:41,423 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-15 15:21:41,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:21:41,423 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:21:41,428 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:21:41,429 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-10-15 15:21:41,794 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-15 15:21:41,794 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:21:41,798 WARN L253 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 279 conjuncts are in the unsatisfiable core [2024-10-15 15:21:41,802 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:21:41,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:21:41,810 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:21:41,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:21:41,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:21:41,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:21:42,101 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:21:42,437 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:42,848 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:42,866 INFO L349 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2024-10-15 15:21:42,866 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:21:42,956 INFO L349 Elim1Store]: treesize reduction 18, result has 60.9 percent of original size [2024-10-15 15:21:42,956 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 61 [2024-10-15 15:21:43,008 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-15 15:21:43,008 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-15 15:21:44,095 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:44,118 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:21:44,427 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:21:44,427 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 88 treesize of output 140 [2024-10-15 15:21:44,473 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:21:44,473 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 90 treesize of output 166 [2024-10-15 15:21:44,707 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 4 proven. 36 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2024-10-15 15:21:44,707 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:22:03,119 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:22:03,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051330286] [2024-10-15 15:22:03,120 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:22:03,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304735916] [2024-10-15 15:22:03,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304735916] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:22:03,120 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:22:03,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2024-10-15 15:22:03,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854260131] [2024-10-15 15:22:03,120 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:22:03,120 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2024-10-15 15:22:03,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:22:03,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2024-10-15 15:22:03,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1431, Unknown=3, NotChecked=0, Total=1560 [2024-10-15 15:22:03,121 INFO L87 Difference]: Start difference. First operand 171 states and 206 transitions. Second operand has 27 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 9 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2024-10-15 15:22:10,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:22:10,752 INFO L93 Difference]: Finished difference Result 234 states and 285 transitions. [2024-10-15 15:22:10,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-10-15 15:22:10,752 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 9 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 58 [2024-10-15 15:22:10,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:22:10,753 INFO L225 Difference]: With dead ends: 234 [2024-10-15 15:22:10,753 INFO L226 Difference]: Without dead ends: 179 [2024-10-15 15:22:10,754 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=220, Invalid=2226, Unknown=4, NotChecked=0, Total=2450 [2024-10-15 15:22:10,755 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 29 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 1283 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 1295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2024-10-15 15:22:10,755 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 644 Invalid, 1295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1283 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2024-10-15 15:22:10,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-10-15 15:22:10,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 125. [2024-10-15 15:22:10,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 80 states have (on average 1.1125) internal successors, (89), 85 states have internal predecessors, (89), 22 states have call successors, (22), 19 states have call predecessors, (22), 22 states have return successors, (40), 20 states have call predecessors, (40), 20 states have call successors, (40) [2024-10-15 15:22:10,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 151 transitions. [2024-10-15 15:22:10,846 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 151 transitions. Word has length 58 [2024-10-15 15:22:10,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:22:10,847 INFO L471 AbstractCegarLoop]: Abstraction has 125 states and 151 transitions. [2024-10-15 15:22:10,847 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 21 states have internal predecessors, (34), 9 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2024-10-15 15:22:10,847 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:22:10,847 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 151 transitions. [2024-10-15 15:22:10,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-10-15 15:22:10,847 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:22:10,848 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:22:10,856 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-10-15 15:22:11,048 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-10-15 15:22:11,048 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:22:11,048 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:22:11,048 INFO L85 PathProgramCache]: Analyzing trace with hash -2056886675, now seen corresponding path program 5 times [2024-10-15 15:22:11,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:22:11,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617023166] [2024-10-15 15:22:11,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:22:11,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:22:11,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:22:11,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [378188989] [2024-10-15 15:22:11,174 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2024-10-15 15:22:11,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:22:11,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:22:11,179 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:22:11,180 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-10-15 15:22:11,657 INFO L227 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2024-10-15 15:22:11,657 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:22:11,662 WARN L253 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 322 conjuncts are in the unsatisfiable core [2024-10-15 15:22:11,667 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:22:11,677 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:22:11,681 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:22:11,685 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:22:11,687 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:22:11,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:22:11,835 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:22:12,336 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:12,871 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:12,898 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2024-10-15 15:22:12,898 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:22:12,994 INFO L349 Elim1Store]: treesize reduction 14, result has 58.8 percent of original size [2024-10-15 15:22:12,995 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 53 [2024-10-15 15:22:13,028 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-10-15 15:22:13,028 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2024-10-15 15:22:14,058 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:14,063 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:14,213 INFO L349 Elim1Store]: treesize reduction 36, result has 52.0 percent of original size [2024-10-15 15:22:14,213 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 108 treesize of output 110 [2024-10-15 15:22:14,330 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:14,822 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:22:14,822 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 176 treesize of output 352 [2024-10-15 15:22:14,929 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:22:14,929 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 94 treesize of output 226 [2024-10-15 15:22:15,599 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2024-10-15 15:22:15,599 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:22:35,353 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:22:35,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617023166] [2024-10-15 15:22:35,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:22:35,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [378188989] [2024-10-15 15:22:35,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [378188989] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:22:35,354 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:22:35,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2024-10-15 15:22:35,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511097535] [2024-10-15 15:22:35,360 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:22:35,360 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2024-10-15 15:22:35,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:22:35,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2024-10-15 15:22:35,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1734, Unknown=3, NotChecked=0, Total=1892 [2024-10-15 15:22:35,361 INFO L87 Difference]: Start difference. First operand 125 states and 151 transitions. Second operand has 30 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-15 15:22:43,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:22:43,021 INFO L93 Difference]: Finished difference Result 182 states and 222 transitions. [2024-10-15 15:22:43,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-10-15 15:22:43,021 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 64 [2024-10-15 15:22:43,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:22:43,022 INFO L225 Difference]: With dead ends: 182 [2024-10-15 15:22:43,022 INFO L226 Difference]: Without dead ends: 170 [2024-10-15 15:22:43,023 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=277, Invalid=2689, Unknown=4, NotChecked=0, Total=2970 [2024-10-15 15:22:43,023 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 31 mSDsluCounter, 534 mSDsCounter, 0 mSdLazyCounter, 1173 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 582 SdHoareTripleChecker+Invalid, 1185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2024-10-15 15:22:43,024 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 582 Invalid, 1185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1173 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2024-10-15 15:22:43,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2024-10-15 15:22:43,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 165. [2024-10-15 15:22:43,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 107 states have (on average 1.1121495327102804) internal successors, (119), 112 states have internal predecessors, (119), 28 states have call successors, (28), 25 states have call predecessors, (28), 29 states have return successors, (53), 27 states have call predecessors, (53), 26 states have call successors, (53) [2024-10-15 15:22:43,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 200 transitions. [2024-10-15 15:22:43,124 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 200 transitions. Word has length 64 [2024-10-15 15:22:43,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:22:43,124 INFO L471 AbstractCegarLoop]: Abstraction has 165 states and 200 transitions. [2024-10-15 15:22:43,124 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 25 states have (on average 1.4) internal successors, (35), 24 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-15 15:22:43,124 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:22:43,124 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 200 transitions. [2024-10-15 15:22:43,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-10-15 15:22:43,125 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:22:43,125 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:22:43,133 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2024-10-15 15:22:43,325 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-10-15 15:22:43,325 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:22:43,325 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:22:43,326 INFO L85 PathProgramCache]: Analyzing trace with hash 1428733995, now seen corresponding path program 3 times [2024-10-15 15:22:43,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:22:43,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050468906] [2024-10-15 15:22:43,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:22:43,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:22:43,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:22:43,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079713493] [2024-10-15 15:22:43,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-10-15 15:22:43,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:22:43,374 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:22:43,378 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:22:43,378 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-10-15 15:22:43,984 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-10-15 15:22:43,985 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:22:43,990 WARN L253 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 285 conjuncts are in the unsatisfiable core [2024-10-15 15:22:43,994 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:22:44,000 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:22:44,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:22:44,010 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:22:44,014 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:22:44,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 15 treesize of output 11 [2024-10-15 15:22:44,488 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:45,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:45,032 INFO L349 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2024-10-15 15:22:45,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:22:45,111 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-15 15:22:45,111 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-15 15:22:45,133 INFO L349 Elim1Store]: treesize reduction 14, result has 58.8 percent of original size [2024-10-15 15:22:45,134 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 48 [2024-10-15 15:22:45,881 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:45,904 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:22:46,188 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:22:46,188 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 87 treesize of output 83 [2024-10-15 15:22:46,210 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:22:46,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 97 treesize of output 101 [2024-10-15 15:22:46,364 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2024-10-15 15:22:46,364 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:23:08,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:23:08,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050468906] [2024-10-15 15:23:08,797 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:23:08,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079713493] [2024-10-15 15:23:08,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079713493] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:23:08,797 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:23:08,797 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2024-10-15 15:23:08,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393154835] [2024-10-15 15:23:08,798 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:23:08,798 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-10-15 15:23:08,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:23:08,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-10-15 15:23:08,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1432, Unknown=3, NotChecked=0, Total=1560 [2024-10-15 15:23:08,799 INFO L87 Difference]: Start difference. First operand 165 states and 200 transitions. Second operand has 28 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-15 15:23:11,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-15 15:23:11,525 INFO L93 Difference]: Finished difference Result 195 states and 236 transitions. [2024-10-15 15:23:11,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-10-15 15:23:11,526 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) Word has length 64 [2024-10-15 15:23:11,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-15 15:23:11,527 INFO L225 Difference]: With dead ends: 195 [2024-10-15 15:23:11,527 INFO L226 Difference]: Without dead ends: 193 [2024-10-15 15:23:11,527 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=223, Invalid=2224, Unknown=3, NotChecked=0, Total=2450 [2024-10-15 15:23:11,528 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 35 mSDsluCounter, 425 mSDsCounter, 0 mSdLazyCounter, 991 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 475 SdHoareTripleChecker+Invalid, 1004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-10-15 15:23:11,528 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 475 Invalid, 1004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 991 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-10-15 15:23:11,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2024-10-15 15:23:11,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 140. [2024-10-15 15:23:11,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 90 states have (on average 1.1111111111111112) internal successors, (100), 94 states have internal predecessors, (100), 24 states have call successors, (24), 21 states have call predecessors, (24), 25 states have return successors, (45), 24 states have call predecessors, (45), 22 states have call successors, (45) [2024-10-15 15:23:11,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 169 transitions. [2024-10-15 15:23:11,628 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 169 transitions. Word has length 64 [2024-10-15 15:23:11,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-15 15:23:11,628 INFO L471 AbstractCegarLoop]: Abstraction has 140 states and 169 transitions. [2024-10-15 15:23:11,628 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 9 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 6 states have call successors, (8) [2024-10-15 15:23:11,628 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:23:11,628 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 169 transitions. [2024-10-15 15:23:11,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2024-10-15 15:23:11,629 INFO L207 NwaCegarLoop]: Found error trace [2024-10-15 15:23:11,629 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-15 15:23:11,638 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2024-10-15 15:23:11,829 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,17 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:23:11,829 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-15 15:23:11,829 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-15 15:23:11,829 INFO L85 PathProgramCache]: Analyzing trace with hash -149387308, now seen corresponding path program 6 times [2024-10-15 15:23:11,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-15 15:23:11,830 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141005714] [2024-10-15 15:23:11,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-15 15:23:11,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-15 15:23:11,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-15 15:23:11,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [675539227] [2024-10-15 15:23:11,926 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2024-10-15 15:23:11,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-15 15:23:11,926 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-10-15 15:23:11,927 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-15 15:23:11,929 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-10-15 15:23:12,593 INFO L227 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2024-10-15 15:23:12,593 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-15 15:23:12,599 WARN L253 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 325 conjuncts are in the unsatisfiable core [2024-10-15 15:23:12,604 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-15 15:23:12,610 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-15 15:23:12,614 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:23:12,619 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-15 15:23:12,630 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-15 15:23:13,021 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:23:13,296 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2024-10-15 15:23:13,297 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-15 15:23:13,307 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:23:13,375 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-10-15 15:23:13,375 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2024-10-15 15:23:13,395 INFO L349 Elim1Store]: treesize reduction 14, result has 58.8 percent of original size [2024-10-15 15:23:13,395 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 43 [2024-10-15 15:23:14,230 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:23:14,235 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:23:14,324 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-15 15:23:14,359 INFO L349 Elim1Store]: treesize reduction 36, result has 52.0 percent of original size [2024-10-15 15:23:14,359 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 82 treesize of output 100 [2024-10-15 15:23:14,846 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:23:14,846 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 160 treesize of output 296 [2024-10-15 15:23:14,935 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-15 15:23:14,936 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 216 treesize of output 288 [2024-10-15 15:23:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2024-10-15 15:23:15,581 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-15 15:23:47,732 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-15 15:23:47,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141005714] [2024-10-15 15:23:47,732 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-15 15:23:47,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675539227] [2024-10-15 15:23:47,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675539227] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-15 15:23:47,732 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-15 15:23:47,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2024-10-15 15:23:47,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131600714] [2024-10-15 15:23:47,732 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-15 15:23:47,733 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-10-15 15:23:47,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-15 15:23:47,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-10-15 15:23:47,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1586, Unknown=5, NotChecked=0, Total=1722 [2024-10-15 15:23:47,734 INFO L87 Difference]: Start difference. First operand 140 states and 169 transitions. Second operand has 28 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 22 states have internal predecessors, (34), 9 states have call successors, (10), 8 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 5 states have call successors, (9)