./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c --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 f1d7dc9d Calling Ultimate with: /root/.sdkman/candidates/java/current/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_sqrt1-ll.c -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 ac02a57e98f6481647f49b84c91fda6d0505e35fbffb37ed6b508f20e911a1af --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 0.2.4-tmp.dk.referee-eval-f1d7dc9-m [2024-09-20 13:20:14,752 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-20 13:20:14,804 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-09-20 13:20:14,807 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-20 13:20:14,808 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-20 13:20:14,842 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-20 13:20:14,842 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-20 13:20:14,843 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-20 13:20:14,851 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-20 13:20:14,855 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-20 13:20:14,855 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-20 13:20:14,855 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-20 13:20:14,855 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-20 13:20:14,856 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-20 13:20:14,856 INFO L153 SettingsManager]: * Use SBE=true [2024-09-20 13:20:14,856 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-20 13:20:14,856 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-20 13:20:14,856 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-20 13:20:14,857 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-20 13:20:14,858 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-20 13:20:14,858 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-20 13:20:14,858 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-20 13:20:14,858 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-20 13:20:14,858 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-20 13:20:14,858 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 13:20:14,859 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-20 13:20:14,859 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-09-20 13:20:14,860 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-09-20 13:20:14,860 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-20 13:20:14,860 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-20 13:20:14,860 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-20 13:20:14,862 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-20 13:20:14,862 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/certificate-witnesses-artifact/automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac02a57e98f6481647f49b84c91fda6d0505e35fbffb37ed6b508f20e911a1af Applying setting for plugin de.uni_freiburg.informatik.ultimate.boogie.procedureinliner: Inline calls to implemented procedures -> NEVER Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> All Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: YAML Format version -> 2.1 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Generate GraphML witnesses -> false [2024-09-20 13:20:15,040 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-20 13:20:15,057 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-20 13:20:15,059 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-20 13:20:15,060 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-20 13:20:15,060 INFO L274 PluginConnector]: CDTParser initialized [2024-09-20 13:20:15,061 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/automizer/../sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c [2024-09-20 13:20:16,346 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-20 13:20:16,511 INFO L384 CDTParser]: Found 1 translation units. [2024-09-20 13:20:16,512 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c [2024-09-20 13:20:16,520 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/automizer/data/2eba2cefe/b30f79c32db34624ba5d8c3645e36b2b/FLAGb351f3c98 [2024-09-20 13:20:16,537 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/automizer/data/2eba2cefe/b30f79c32db34624ba5d8c3645e36b2b [2024-09-20 13:20:16,540 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-20 13:20:16,541 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-09-20 13:20:16,543 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-20 13:20:16,543 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-20 13:20:16,547 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-20 13:20:16,550 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,551 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bf14ecb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16, skipping insertion in model container [2024-09-20 13:20:16,551 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,571 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-20 13:20:16,695 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_sqrt1-ll.c[1052,1065] [2024-09-20 13:20:16,708 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 13:20:16,715 INFO L200 MainTranslator]: Completed pre-run [2024-09-20 13:20:16,724 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_sqrt1-ll.c[1052,1065] [2024-09-20 13:20:16,733 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-20 13:20:16,745 INFO L204 MainTranslator]: Completed translation [2024-09-20 13:20:16,745 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16 WrapperNode [2024-09-20 13:20:16,745 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-09-20 13:20:16,746 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-09-20 13:20:16,746 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-09-20 13:20:16,747 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-09-20 13:20:16,752 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,757 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,762 INFO L138 Inliner]: procedures = 16, calls = 58, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2024-09-20 13:20:16,763 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-09-20 13:20:16,763 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-09-20 13:20:16,763 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-09-20 13:20:16,763 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-09-20 13:20:16,770 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,771 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,772 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,789 INFO L175 MemorySlicer]: Split 33 memory accesses to 5 slices as follows [2, 9, 2, 12, 8]. 36 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0]. The 7 writes are split as follows [0, 2, 1, 2, 2]. [2024-09-20 13:20:16,789 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,789 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,794 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,795 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,795 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,796 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,798 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-09-20 13:20:16,798 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-09-20 13:20:16,798 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-09-20 13:20:16,799 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-09-20 13:20:16,799 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (1/1) ... [2024-09-20 13:20:16,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-20 13:20:16,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:16,840 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) [2024-09-20 13:20:16,843 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 [2024-09-20 13:20:16,886 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-09-20 13:20:16,886 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-09-20 13:20:16,886 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-09-20 13:20:16,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-09-20 13:20:16,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-09-20 13:20:16,886 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-09-20 13:20:16,887 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-09-20 13:20:16,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-09-20 13:20:16,889 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_29_to_40_0 [2024-09-20 13:20:16,889 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_29_to_40_0 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-09-20 13:20:16,889 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-09-20 13:20:16,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-09-20 13:20:16,890 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-09-20 13:20:16,890 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-09-20 13:20:17,009 INFO L242 CfgBuilder]: Building ICFG [2024-09-20 13:20:17,011 INFO L268 CfgBuilder]: Building CFG for each procedure with an implementation [2024-09-20 13:20:17,176 INFO L? ?]: Removed 6 outVars from TransFormulas that were not future-live. [2024-09-20 13:20:17,177 INFO L291 CfgBuilder]: Performing block encoding [2024-09-20 13:20:17,207 INFO L313 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-09-20 13:20:17,207 INFO L318 CfgBuilder]: Removed 1 assume(true) statements. [2024-09-20 13:20:17,207 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:20:17 BoogieIcfgContainer [2024-09-20 13:20:17,207 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-09-20 13:20:17,209 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-09-20 13:20:17,209 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-09-20 13:20:17,217 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-09-20 13:20:17,217 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.09 01:20:16" (1/3) ... [2024-09-20 13:20:17,218 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21d6a6de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:20:17, skipping insertion in model container [2024-09-20 13:20:17,218 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.09 01:20:16" (2/3) ... [2024-09-20 13:20:17,218 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21d6a6de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.09 01:20:17, skipping insertion in model container [2024-09-20 13:20:17,218 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.09 01:20:17" (3/3) ... [2024-09-20 13:20:17,219 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_sqrt1-ll.c [2024-09-20 13:20:17,230 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:All NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-09-20 13:20:17,230 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-09-20 13:20:17,273 INFO L335 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-09-20 13:20:17,278 INFO L336 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;@4798dcc1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-09-20 13:20:17,278 INFO L337 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-09-20 13:20:17,281 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 20 states have internal predecessors, (22), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2024-09-20 13:20:17,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-09-20 13:20:17,287 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:17,287 INFO L216 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:20:17,288 INFO L399 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:17,292 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:17,292 INFO L85 PathProgramCache]: Analyzing trace with hash 793561350, now seen corresponding path program 1 times [2024-09-20 13:20:17,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:17,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313165518] [2024-09-20 13:20:17,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:17,300 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:17,894 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-20 13:20:17,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:17,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-20 13:20:17,902 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:17,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313165518] [2024-09-20 13:20:17,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313165518] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-20 13:20:17,902 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-20 13:20:17,903 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-09-20 13:20:17,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48439298] [2024-09-20 13:20:17,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-20 13:20:17,908 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-09-20 13:20:17,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:17,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-09-20 13:20:17,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-09-20 13:20:17,929 INFO L87 Difference]: Start difference. First operand has 34 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 20 states have internal predecessors, (22), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-20 13:20:18,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:18,143 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2024-09-20 13:20:18,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-09-20 13:20:18,145 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2024-09-20 13:20:18,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:18,152 INFO L225 Difference]: With dead ends: 80 [2024-09-20 13:20:18,152 INFO L226 Difference]: Without dead ends: 48 [2024-09-20 13:20:18,170 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2024-09-20 13:20:18,174 INFO L434 NwaCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:18,176 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 160 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-20 13:20:18,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2024-09-20 13:20:18,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45. [2024-09-20 13:20:18,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 28 states have internal predecessors, (29), 13 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2024-09-20 13:20:18,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2024-09-20 13:20:18,248 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 12 [2024-09-20 13:20:18,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:18,248 INFO L474 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2024-09-20 13:20:18,248 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 6 states have internal predecessors, (7), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2024-09-20 13:20:18,249 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:18,249 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2024-09-20 13:20:18,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-09-20 13:20:18,250 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:18,250 INFO L216 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:20:18,250 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-09-20 13:20:18,250 INFO L399 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:18,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:18,251 INFO L85 PathProgramCache]: Analyzing trace with hash -179619090, now seen corresponding path program 1 times [2024-09-20 13:20:18,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:18,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77726208] [2024-09-20 13:20:18,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:18,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:18,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:20:18,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1838242127] [2024-09-20 13:20:18,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:18,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:18,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:18,283 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) [2024-09-20 13:20:18,285 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-09-20 13:20:18,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:18,351 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 44 conjuncts are in the unsatisfiable core [2024-09-20 13:20:18,356 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:18,386 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 11 treesize of output 7 [2024-09-20 13:20:18,390 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 [2024-09-20 13:20:18,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-20 13:20:18,571 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:18,751 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 43 treesize of output 27 [2024-09-20 13:20:18,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-09-20 13:20:18,860 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:18,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77726208] [2024-09-20 13:20:18,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:20:18,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838242127] [2024-09-20 13:20:18,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838242127] provided 0 perfect and 2 imperfect interpolant sequences [2024-09-20 13:20:18,862 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-09-20 13:20:18,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2024-09-20 13:20:18,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847372555] [2024-09-20 13:20:18,863 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:18,863 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-09-20 13:20:18,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:18,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-09-20 13:20:18,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2024-09-20 13:20:18,864 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-09-20 13:20:23,658 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.88s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2024-09-20 13:20:23,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:23,781 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2024-09-20 13:20:23,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-09-20 13:20:23,782 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 18 [2024-09-20 13:20:23,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:23,784 INFO L225 Difference]: With dead ends: 72 [2024-09-20 13:20:23,784 INFO L226 Difference]: Without dead ends: 70 [2024-09-20 13:20:23,785 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=191, Invalid=931, Unknown=0, NotChecked=0, Total=1122 [2024-09-20 13:20:23,786 INFO L434 NwaCegarLoop]: 18 mSDtfsCounter, 59 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:23,786 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 175 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2024-09-20 13:20:23,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2024-09-20 13:20:23,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2024-09-20 13:20:23,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 41 states have internal predecessors, (43), 16 states have call successors, (16), 9 states have call predecessors, (16), 9 states have return successors, (15), 14 states have call predecessors, (15), 13 states have call successors, (15) [2024-09-20 13:20:23,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 74 transitions. [2024-09-20 13:20:23,809 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 74 transitions. Word has length 18 [2024-09-20 13:20:23,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:23,809 INFO L474 AbstractCegarLoop]: Abstraction has 65 states and 74 transitions. [2024-09-20 13:20:23,809 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2024-09-20 13:20:23,810 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:23,810 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 74 transitions. [2024-09-20 13:20:23,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2024-09-20 13:20:23,810 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:23,810 INFO L216 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:20:23,826 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-09-20 13:20:24,014 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:24,015 INFO L399 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:24,015 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:24,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1495099348, now seen corresponding path program 1 times [2024-09-20 13:20:24,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:24,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432774393] [2024-09-20 13:20:24,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:24,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:24,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:20:24,039 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1914066562] [2024-09-20 13:20:24,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:24,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:24,039 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:24,044 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) [2024-09-20 13:20:24,046 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-09-20 13:20:24,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:24,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 37 conjuncts are in the unsatisfiable core [2024-09-20 13:20:24,105 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:24,108 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 [2024-09-20 13:20:24,111 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 [2024-09-20 13:20:24,234 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-09-20 13:20:24,234 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:24,325 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-09-20 13:20:24,326 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:24,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432774393] [2024-09-20 13:20:24,326 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:20:24,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914066562] [2024-09-20 13:20:24,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914066562] provided 1 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:24,326 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:20:24,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 13 [2024-09-20 13:20:24,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855007283] [2024-09-20 13:20:24,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-20 13:20:24,327 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-09-20 13:20:24,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:24,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-09-20 13:20:24,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2024-09-20 13:20:24,328 INFO L87 Difference]: Start difference. First operand 65 states and 74 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-09-20 13:20:24,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:24,563 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2024-09-20 13:20:24,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-09-20 13:20:24,564 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2024-09-20 13:20:24,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:24,565 INFO L225 Difference]: With dead ends: 77 [2024-09-20 13:20:24,565 INFO L226 Difference]: Without dead ends: 75 [2024-09-20 13:20:24,565 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2024-09-20 13:20:24,566 INFO L434 NwaCegarLoop]: 24 mSDtfsCounter, 17 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:24,566 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 121 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-20 13:20:24,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2024-09-20 13:20:24,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2024-09-20 13:20:24,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 47 states have internal predecessors, (49), 16 states have call successors, (16), 11 states have call predecessors, (16), 11 states have return successors, (15), 14 states have call predecessors, (15), 13 states have call successors, (15) [2024-09-20 13:20:24,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 80 transitions. [2024-09-20 13:20:24,600 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 80 transitions. Word has length 24 [2024-09-20 13:20:24,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:24,600 INFO L474 AbstractCegarLoop]: Abstraction has 73 states and 80 transitions. [2024-09-20 13:20:24,600 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-09-20 13:20:24,601 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:24,601 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 80 transitions. [2024-09-20 13:20:24,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-09-20 13:20:24,602 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:24,602 INFO L216 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:20:24,617 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-09-20 13:20:24,806 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:24,807 INFO L399 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:24,807 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:24,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1496297149, now seen corresponding path program 1 times [2024-09-20 13:20:24,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:24,808 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525689753] [2024-09-20 13:20:24,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:24,808 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:24,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,206 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-20 13:20:25,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,209 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:20:25,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,213 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:20:25,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,215 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2024-09-20 13:20:25,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,218 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-20 13:20:25,218 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:25,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525689753] [2024-09-20 13:20:25,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525689753] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:25,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078170197] [2024-09-20 13:20:25,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:25,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:25,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:25,220 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) [2024-09-20 13:20:25,221 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-09-20 13:20:25,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:25,293 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 42 conjuncts are in the unsatisfiable core [2024-09-20 13:20:25,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:25,476 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 33 treesize of output 21 [2024-09-20 13:20:25,478 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 33 treesize of output 21 [2024-09-20 13:20:25,500 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 23 treesize of output 15 [2024-09-20 13:20:25,502 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 [2024-09-20 13:20:25,540 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-09-20 13:20:25,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:30,041 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-09-20 13:20:30,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078170197] provided 0 perfect and 2 imperfect interpolant sequences [2024-09-20 13:20:30,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-09-20 13:20:30,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 21 [2024-09-20 13:20:30,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996578072] [2024-09-20 13:20:30,042 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:30,042 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-09-20 13:20:30,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:30,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-09-20 13:20:30,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=356, Unknown=1, NotChecked=0, Total=420 [2024-09-20 13:20:30,043 INFO L87 Difference]: Start difference. First operand 73 states and 80 transitions. Second operand has 21 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 9 states have call successors, (17), 7 states have call predecessors, (17), 4 states have return successors, (10), 3 states have call predecessors, (10), 5 states have call successors, (10) [2024-09-20 13:20:32,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:32,362 INFO L93 Difference]: Finished difference Result 95 states and 107 transitions. [2024-09-20 13:20:32,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-09-20 13:20:32,363 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 9 states have call successors, (17), 7 states have call predecessors, (17), 4 states have return successors, (10), 3 states have call predecessors, (10), 5 states have call successors, (10) Word has length 34 [2024-09-20 13:20:32,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:32,364 INFO L225 Difference]: With dead ends: 95 [2024-09-20 13:20:32,364 INFO L226 Difference]: Without dead ends: 93 [2024-09-20 13:20:32,364 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 65 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=155, Invalid=774, Unknown=1, NotChecked=0, Total=930 [2024-09-20 13:20:32,365 INFO L434 NwaCegarLoop]: 24 mSDtfsCounter, 64 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:32,365 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 160 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2024-09-20 13:20:32,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2024-09-20 13:20:32,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 81. [2024-09-20 13:20:32,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 50 states have (on average 1.08) internal successors, (54), 53 states have internal predecessors, (54), 17 states have call successors, (17), 12 states have call predecessors, (17), 13 states have return successors, (20), 16 states have call predecessors, (20), 15 states have call successors, (20) [2024-09-20 13:20:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 91 transitions. [2024-09-20 13:20:32,394 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 91 transitions. Word has length 34 [2024-09-20 13:20:32,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:32,394 INFO L474 AbstractCegarLoop]: Abstraction has 81 states and 91 transitions. [2024-09-20 13:20:32,395 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 2.3125) internal successors, (37), 17 states have internal predecessors, (37), 9 states have call successors, (17), 7 states have call predecessors, (17), 4 states have return successors, (10), 3 states have call predecessors, (10), 5 states have call successors, (10) [2024-09-20 13:20:32,395 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 91 transitions. [2024-09-20 13:20:32,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-09-20 13:20:32,396 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:32,396 INFO L216 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:20:32,408 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-09-20 13:20:32,599 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:32,600 INFO L399 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:32,600 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:32,600 INFO L85 PathProgramCache]: Analyzing trace with hash 2049263454, now seen corresponding path program 1 times [2024-09-20 13:20:32,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:32,600 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43987823] [2024-09-20 13:20:32,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:32,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:32,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:32,888 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-20 13:20:32,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:32,945 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-09-20 13:20:32,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:33,035 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:20:33,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:33,038 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:20:33,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:33,040 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:20:33,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:33,043 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-20 13:20:33,043 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:33,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43987823] [2024-09-20 13:20:33,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43987823] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-20 13:20:33,043 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-20 13:20:33,043 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-09-20 13:20:33,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184170033] [2024-09-20 13:20:33,044 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-20 13:20:33,044 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-09-20 13:20:33,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:33,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-09-20 13:20:33,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2024-09-20 13:20:33,045 INFO L87 Difference]: Start difference. First operand 81 states and 91 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2024-09-20 13:20:33,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:33,771 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2024-09-20 13:20:33,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-09-20 13:20:33,772 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2024-09-20 13:20:33,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:33,773 INFO L225 Difference]: With dead ends: 92 [2024-09-20 13:20:33,773 INFO L226 Difference]: Without dead ends: 90 [2024-09-20 13:20:33,774 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2024-09-20 13:20:33,774 INFO L434 NwaCegarLoop]: 17 mSDtfsCounter, 23 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:33,778 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 65 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-09-20 13:20:33,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2024-09-20 13:20:33,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2024-09-20 13:20:33,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 58 states have internal predecessors, (59), 18 states have call successors, (18), 13 states have call predecessors, (18), 15 states have return successors, (22), 17 states have call predecessors, (22), 16 states have call successors, (22) [2024-09-20 13:20:33,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 99 transitions. [2024-09-20 13:20:33,831 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 99 transitions. Word has length 34 [2024-09-20 13:20:33,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:33,831 INFO L474 AbstractCegarLoop]: Abstraction has 89 states and 99 transitions. [2024-09-20 13:20:33,831 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 4 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2024-09-20 13:20:33,831 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:33,832 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 99 transitions. [2024-09-20 13:20:33,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-09-20 13:20:33,832 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:33,832 INFO L216 NwaCegarLoop]: trace histogram [5, 4, 4, 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, 1] [2024-09-20 13:20:33,832 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-09-20 13:20:33,832 INFO L399 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:33,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:33,833 INFO L85 PathProgramCache]: Analyzing trace with hash 863672261, now seen corresponding path program 1 times [2024-09-20 13:20:33,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:33,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234339639] [2024-09-20 13:20:33,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:33,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:33,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:20:33,852 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2028489001] [2024-09-20 13:20:33,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:33,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:33,852 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:33,854 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) [2024-09-20 13:20:33,855 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-09-20 13:20:33,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:33,918 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-09-20 13:20:33,919 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:33,929 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 [2024-09-20 13:20:33,945 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 [2024-09-20 13:20:34,538 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-20 13:20:34,538 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:35,189 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:35,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234339639] [2024-09-20 13:20:35,192 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:20:35,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028489001] [2024-09-20 13:20:35,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028489001] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:35,192 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:20:35,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2024-09-20 13:20:35,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954333123] [2024-09-20 13:20:35,192 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:35,193 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-09-20 13:20:35,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:35,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-09-20 13:20:35,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2024-09-20 13:20:35,193 INFO L87 Difference]: Start difference. First operand 89 states and 99 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2024-09-20 13:20:36,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:36,223 INFO L93 Difference]: Finished difference Result 105 states and 114 transitions. [2024-09-20 13:20:36,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-09-20 13:20:36,224 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2024-09-20 13:20:36,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:36,225 INFO L225 Difference]: With dead ends: 105 [2024-09-20 13:20:36,225 INFO L226 Difference]: Without dead ends: 101 [2024-09-20 13:20:36,225 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2024-09-20 13:20:36,226 INFO L434 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:36,226 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 65 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-09-20 13:20:36,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2024-09-20 13:20:36,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2024-09-20 13:20:36,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 62 states have (on average 1.064516129032258) internal successors, (66), 64 states have internal predecessors, (66), 20 states have call successors, (20), 15 states have call predecessors, (20), 16 states have return successors, (23), 19 states have call predecessors, (23), 17 states have call successors, (23) [2024-09-20 13:20:36,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 109 transitions. [2024-09-20 13:20:36,283 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 109 transitions. Word has length 40 [2024-09-20 13:20:36,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:36,283 INFO L474 AbstractCegarLoop]: Abstraction has 99 states and 109 transitions. [2024-09-20 13:20:36,283 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2024-09-20 13:20:36,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:36,284 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 109 transitions. [2024-09-20 13:20:36,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-09-20 13:20:36,284 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:36,285 INFO L216 NwaCegarLoop]: trace histogram [6, 5, 5, 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, 1, 1, 1, 1] [2024-09-20 13:20:36,297 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-09-20 13:20:36,485 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:36,485 INFO L399 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:36,486 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:36,486 INFO L85 PathProgramCache]: Analyzing trace with hash 398231530, now seen corresponding path program 1 times [2024-09-20 13:20:36,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:36,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394354398] [2024-09-20 13:20:36,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:36,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:20:36,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [201526630] [2024-09-20 13:20:36,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:36,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:36,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:36,508 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) [2024-09-20 13:20:36,509 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-09-20 13:20:36,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:36,576 INFO L262 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-09-20 13:20:36,577 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:36,587 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 [2024-09-20 13:20:36,603 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 [2024-09-20 13:20:37,322 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 30 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-09-20 13:20:37,323 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:37,874 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:37,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394354398] [2024-09-20 13:20:37,874 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:20:37,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201526630] [2024-09-20 13:20:37,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201526630] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:37,875 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:20:37,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2024-09-20 13:20:37,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660258023] [2024-09-20 13:20:37,875 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:37,875 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-09-20 13:20:37,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:37,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-09-20 13:20:37,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2024-09-20 13:20:37,876 INFO L87 Difference]: Start difference. First operand 99 states and 109 transitions. Second operand has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2024-09-20 13:20:38,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:38,749 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2024-09-20 13:20:38,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-09-20 13:20:38,750 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2024-09-20 13:20:38,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:38,751 INFO L225 Difference]: With dead ends: 101 [2024-09-20 13:20:38,751 INFO L226 Difference]: Without dead ends: 81 [2024-09-20 13:20:38,751 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2024-09-20 13:20:38,752 INFO L434 NwaCegarLoop]: 15 mSDtfsCounter, 18 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 23 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:38,753 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 68 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 156 Invalid, 3 Unknown, 0 Unchecked, 0.6s Time] [2024-09-20 13:20:38,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2024-09-20 13:20:38,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2024-09-20 13:20:38,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 50 states have (on average 1.06) internal successors, (53), 52 states have internal predecessors, (53), 17 states have call successors, (17), 12 states have call predecessors, (17), 13 states have return successors, (20), 16 states have call predecessors, (20), 15 states have call successors, (20) [2024-09-20 13:20:38,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 90 transitions. [2024-09-20 13:20:38,775 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 90 transitions. Word has length 46 [2024-09-20 13:20:38,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:38,775 INFO L474 AbstractCegarLoop]: Abstraction has 81 states and 90 transitions. [2024-09-20 13:20:38,776 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2024-09-20 13:20:38,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:38,776 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 90 transitions. [2024-09-20 13:20:38,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-09-20 13:20:38,777 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:38,777 INFO L216 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 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] [2024-09-20 13:20:38,789 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-09-20 13:20:38,981 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-09-20 13:20:38,982 INFO L399 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:38,982 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:38,982 INFO L85 PathProgramCache]: Analyzing trace with hash 15363389, now seen corresponding path program 1 times [2024-09-20 13:20:38,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:38,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497594564] [2024-09-20 13:20:38,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:38,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:38,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:39,594 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-20 13:20:39,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:39,678 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-09-20 13:20:39,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,433 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:20:40,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,448 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:20:40,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,460 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:20:40,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,472 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2024-09-20 13:20:40,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,612 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:20:40,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,615 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:20:40,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,618 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:20:40,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,620 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2024-09-20 13:20:40,620 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:40,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497594564] [2024-09-20 13:20:40,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497594564] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:40,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185937088] [2024-09-20 13:20:40,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:40,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:40,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:40,622 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) [2024-09-20 13:20:40,623 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-09-20 13:20:40,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:40,695 INFO L262 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 62 conjuncts are in the unsatisfiable core [2024-09-20 13:20:40,697 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:40,712 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 [2024-09-20 13:20:40,728 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 [2024-09-20 13:20:42,546 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 [2024-09-20 13:20:42,571 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 [2024-09-20 13:20:42,763 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 9 proven. 54 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-09-20 13:20:42,763 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:44,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185937088] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:44,146 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-09-20 13:20:44,146 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 22 [2024-09-20 13:20:44,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654506946] [2024-09-20 13:20:44,146 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:44,146 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-09-20 13:20:44,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:44,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-09-20 13:20:44,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2024-09-20 13:20:44,147 INFO L87 Difference]: Start difference. First operand 81 states and 90 transitions. Second operand has 22 states, 16 states have (on average 2.5) internal successors, (40), 19 states have internal predecessors, (40), 10 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2024-09-20 13:20:46,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:20:46,582 INFO L93 Difference]: Finished difference Result 90 states and 99 transitions. [2024-09-20 13:20:46,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-09-20 13:20:46,583 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 16 states have (on average 2.5) internal successors, (40), 19 states have internal predecessors, (40), 10 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) Word has length 58 [2024-09-20 13:20:46,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:20:46,584 INFO L225 Difference]: With dead ends: 90 [2024-09-20 13:20:46,584 INFO L226 Difference]: Without dead ends: 88 [2024-09-20 13:20:46,585 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 73 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=192, Invalid=1140, Unknown=0, NotChecked=0, Total=1332 [2024-09-20 13:20:46,585 INFO L434 NwaCegarLoop]: 15 mSDtfsCounter, 43 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-09-20 13:20:46,585 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 88 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 380 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-09-20 13:20:46,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2024-09-20 13:20:46,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2024-09-20 13:20:46,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 56 states have internal predecessors, (57), 18 states have call successors, (18), 13 states have call predecessors, (18), 14 states have return successors, (21), 17 states have call predecessors, (21), 16 states have call successors, (21) [2024-09-20 13:20:46,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 96 transitions. [2024-09-20 13:20:46,612 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 96 transitions. Word has length 58 [2024-09-20 13:20:46,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:20:46,613 INFO L474 AbstractCegarLoop]: Abstraction has 87 states and 96 transitions. [2024-09-20 13:20:46,613 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 16 states have (on average 2.5) internal successors, (40), 19 states have internal predecessors, (40), 10 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2024-09-20 13:20:46,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:46,613 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 96 transitions. [2024-09-20 13:20:46,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2024-09-20 13:20:46,614 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:20:46,614 INFO L216 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 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] [2024-09-20 13:20:46,627 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-09-20 13:20:46,818 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:46,819 INFO L399 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:20:46,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:20:46,819 INFO L85 PathProgramCache]: Analyzing trace with hash 765303396, now seen corresponding path program 1 times [2024-09-20 13:20:46,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:20:46,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746954280] [2024-09-20 13:20:46,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:46,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:20:46,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:20:46,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1641279675] [2024-09-20 13:20:46,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:20:46,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:20:46,838 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:20:46,841 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) [2024-09-20 13:20:46,842 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-09-20 13:20:46,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:20:46,932 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 86 conjuncts are in the unsatisfiable core [2024-09-20 13:20:46,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:20:46,952 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 [2024-09-20 13:20:46,968 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 [2024-09-20 13:20:48,127 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 38 treesize of output 30 [2024-09-20 13:20:49,270 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 [2024-09-20 13:20:49,289 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 [2024-09-20 13:20:49,929 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 25 proven. 72 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-09-20 13:20:49,929 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:20:51,423 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 81 treesize of output 69 [2024-09-20 13:20:54,871 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 54 treesize of output 30 [2024-09-20 13:20:54,905 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 30 treesize of output 22 [2024-09-20 13:20:58,437 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:20:58,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746954280] [2024-09-20 13:20:58,437 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:20:58,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641279675] [2024-09-20 13:20:58,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641279675] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:20:58,437 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:20:58,437 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-09-20 13:20:58,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131712068] [2024-09-20 13:20:58,437 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:20:58,438 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-09-20 13:20:58,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:20:58,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-09-20 13:20:58,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2024-09-20 13:20:58,439 INFO L87 Difference]: Start difference. First operand 87 states and 96 transitions. Second operand has 20 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 18 states have internal predecessors, (35), 10 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (10), 6 states have call predecessors, (10), 9 states have call successors, (10) [2024-09-20 13:21:02,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:21:02,630 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2024-09-20 13:21:02,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-09-20 13:21:02,631 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 18 states have internal predecessors, (35), 10 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (10), 6 states have call predecessors, (10), 9 states have call successors, (10) Word has length 64 [2024-09-20 13:21:02,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:21:02,632 INFO L225 Difference]: With dead ends: 103 [2024-09-20 13:21:02,633 INFO L226 Difference]: Without dead ends: 99 [2024-09-20 13:21:02,634 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=306, Invalid=1764, Unknown=0, NotChecked=0, Total=2070 [2024-09-20 13:21:02,634 INFO L434 NwaCegarLoop]: 14 mSDtfsCounter, 43 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 52 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2024-09-20 13:21:02,635 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 82 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 543 Invalid, 3 Unknown, 0 Unchecked, 2.0s Time] [2024-09-20 13:21:02,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2024-09-20 13:21:02,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2024-09-20 13:21:02,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 62 states have internal predecessors, (64), 20 states have call successors, (20), 15 states have call predecessors, (20), 15 states have return successors, (22), 19 states have call predecessors, (22), 17 states have call successors, (22) [2024-09-20 13:21:02,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 106 transitions. [2024-09-20 13:21:02,674 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 106 transitions. Word has length 64 [2024-09-20 13:21:02,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:21:02,674 INFO L474 AbstractCegarLoop]: Abstraction has 97 states and 106 transitions. [2024-09-20 13:21:02,674 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 18 states have internal predecessors, (35), 10 states have call successors, (12), 6 states have call predecessors, (12), 7 states have return successors, (10), 6 states have call predecessors, (10), 9 states have call successors, (10) [2024-09-20 13:21:02,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:02,675 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 106 transitions. [2024-09-20 13:21:02,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2024-09-20 13:21:02,678 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:21:02,678 INFO L216 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 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] [2024-09-20 13:21:02,691 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-09-20 13:21:02,881 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:02,881 INFO L399 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:21:02,882 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:02,882 INFO L85 PathProgramCache]: Analyzing trace with hash 1393874761, now seen corresponding path program 1 times [2024-09-20 13:21:02,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:21:02,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482709164] [2024-09-20 13:21:02,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:21:02,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:21:02,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:21:02,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1411371282] [2024-09-20 13:21:02,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:21:02,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:02,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:21:02,908 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) [2024-09-20 13:21:02,915 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-09-20 13:21:03,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:03,006 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 89 conjuncts are in the unsatisfiable core [2024-09-20 13:21:03,011 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:21:03,021 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 [2024-09-20 13:21:03,036 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 [2024-09-20 13:21:03,053 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 [2024-09-20 13:21:04,793 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 25 treesize of output 17 [2024-09-20 13:21:04,886 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-09-20 13:21:04,886 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 [2024-09-20 13:21:04,933 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 [2024-09-20 13:21:06,394 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 38 proven. 80 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-09-20 13:21:06,395 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:21:12,995 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:21:12,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482709164] [2024-09-20 13:21:12,995 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:21:12,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411371282] [2024-09-20 13:21:12,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411371282] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:21:12,995 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:21:12,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-09-20 13:21:12,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537433067] [2024-09-20 13:21:12,997 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:21:12,997 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-09-20 13:21:12,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:21:12,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-09-20 13:21:12,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=660, Unknown=1, NotChecked=0, Total=756 [2024-09-20 13:21:13,000 INFO L87 Difference]: Start difference. First operand 97 states and 106 transitions. Second operand has 21 states, 16 states have (on average 2.3125) internal successors, (37), 19 states have internal predecessors, (37), 9 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) [2024-09-20 13:21:17,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:21:17,370 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2024-09-20 13:21:17,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-09-20 13:21:17,370 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 2.3125) internal successors, (37), 19 states have internal predecessors, (37), 9 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) Word has length 70 [2024-09-20 13:21:17,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:21:17,371 INFO L225 Difference]: With dead ends: 99 [2024-09-20 13:21:17,371 INFO L226 Difference]: Without dead ends: 77 [2024-09-20 13:21:17,372 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=239, Invalid=1566, Unknown=1, NotChecked=0, Total=1806 [2024-09-20 13:21:17,372 INFO L434 NwaCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 25 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2024-09-20 13:21:17,373 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 103 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 501 Invalid, 9 Unknown, 0 Unchecked, 2.2s Time] [2024-09-20 13:21:17,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2024-09-20 13:21:17,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2024-09-20 13:21:17,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 49 states have internal predecessors, (50), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (18), 15 states have call predecessors, (18), 15 states have call successors, (18) [2024-09-20 13:21:17,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2024-09-20 13:21:17,456 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 70 [2024-09-20 13:21:17,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:21:17,457 INFO L474 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2024-09-20 13:21:17,457 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 2.3125) internal successors, (37), 19 states have internal predecessors, (37), 9 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (11), 6 states have call predecessors, (11), 8 states have call successors, (11) [2024-09-20 13:21:17,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:17,457 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2024-09-20 13:21:17,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2024-09-20 13:21:17,458 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:21:17,458 INFO L216 NwaCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:21:17,471 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-09-20 13:21:17,662 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:17,663 INFO L399 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:21:17,663 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:17,663 INFO L85 PathProgramCache]: Analyzing trace with hash 657256540, now seen corresponding path program 2 times [2024-09-20 13:21:17,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:21:17,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360214290] [2024-09-20 13:21:17,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:21:17,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:21:17,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:18,413 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2024-09-20 13:21:18,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:18,474 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2024-09-20 13:21:18,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:19,396 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:21:19,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:19,404 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:21:19,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:19,412 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:21:19,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:19,419 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2024-09-20 13:21:19,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,048 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:21:20,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,056 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:21:20,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,059 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:21:20,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,066 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2024-09-20 13:21:20,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,790 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-09-20 13:21:20,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,795 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-09-20 13:21:20,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,798 INFO L381 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-09-20 13:21:20,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-20 13:21:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 31 proven. 16 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2024-09-20 13:21:20,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:21:20,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360214290] [2024-09-20 13:21:20,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360214290] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:21:20,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4283864] [2024-09-20 13:21:20,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-09-20 13:21:20,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:20,801 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:21:20,802 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) [2024-09-20 13:21:20,805 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-09-20 13:21:20,916 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-09-20 13:21:20,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-20 13:21:20,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 95 conjuncts are in the unsatisfiable core [2024-09-20 13:21:20,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:21:20,939 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 [2024-09-20 13:21:22,089 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 17 treesize of output 9 [2024-09-20 13:21:23,576 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 [2024-09-20 13:21:24,140 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 85 proven. 31 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-09-20 13:21:24,144 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:21:26,849 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-09-20 13:21:26,853 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 92 treesize of output 91 [2024-09-20 13:21:27,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4283864] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:21:27,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-09-20 13:21:27,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 32 [2024-09-20 13:21:27,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151472959] [2024-09-20 13:21:27,994 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-09-20 13:21:27,995 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-09-20 13:21:27,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:21:27,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-09-20 13:21:27,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1109, Unknown=0, NotChecked=0, Total=1260 [2024-09-20 13:21:27,997 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 32 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 27 states have internal predecessors, (54), 16 states have call successors, (25), 7 states have call predecessors, (25), 9 states have return successors, (22), 13 states have call predecessors, (22), 14 states have call successors, (22) [2024-09-20 13:21:32,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:21:32,335 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2024-09-20 13:21:32,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-09-20 13:21:32,336 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 27 states have internal predecessors, (54), 16 states have call successors, (25), 7 states have call predecessors, (25), 9 states have return successors, (22), 13 states have call predecessors, (22), 14 states have call successors, (22) Word has length 82 [2024-09-20 13:21:32,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:21:32,339 INFO L225 Difference]: With dead ends: 88 [2024-09-20 13:21:32,339 INFO L226 Difference]: Without dead ends: 86 [2024-09-20 13:21:32,340 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 100 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=337, Invalid=2213, Unknown=0, NotChecked=0, Total=2550 [2024-09-20 13:21:32,342 INFO L434 NwaCegarLoop]: 15 mSDtfsCounter, 59 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 623 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 623 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-09-20 13:21:32,342 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 122 Invalid, 684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 623 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-09-20 13:21:32,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-09-20 13:21:32,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 81. [2024-09-20 13:21:32,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 52 states have internal predecessors, (53), 17 states have call successors, (17), 13 states have call predecessors, (17), 12 states have return successors, (18), 15 states have call predecessors, (18), 15 states have call successors, (18) [2024-09-20 13:21:32,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 88 transitions. [2024-09-20 13:21:32,393 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 88 transitions. Word has length 82 [2024-09-20 13:21:32,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:21:32,393 INFO L474 AbstractCegarLoop]: Abstraction has 81 states and 88 transitions. [2024-09-20 13:21:32,393 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 22 states have (on average 2.4545454545454546) internal successors, (54), 27 states have internal predecessors, (54), 16 states have call successors, (25), 7 states have call predecessors, (25), 9 states have return successors, (22), 13 states have call predecessors, (22), 14 states have call successors, (22) [2024-09-20 13:21:32,397 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:32,397 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 88 transitions. [2024-09-20 13:21:32,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-09-20 13:21:32,398 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:21:32,398 INFO L216 NwaCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:21:32,411 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-09-20 13:21:32,598 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-09-20 13:21:32,598 INFO L399 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:21:32,599 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:32,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1385368131, now seen corresponding path program 2 times [2024-09-20 13:21:32,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:21:32,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986680553] [2024-09-20 13:21:32,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:21:32,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:21:32,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:21:32,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [915227858] [2024-09-20 13:21:32,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-09-20 13:21:32,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:32,626 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:21:32,630 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) [2024-09-20 13:21:32,632 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-09-20 13:21:32,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-09-20 13:21:32,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-20 13:21:32,749 INFO L262 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 141 conjuncts are in the unsatisfiable core [2024-09-20 13:21:32,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:21:32,786 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 [2024-09-20 13:21:32,796 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 [2024-09-20 13:21:32,819 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 [2024-09-20 13:21:44,443 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 36 treesize of output 13 [2024-09-20 13:21:44,470 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 [2024-09-20 13:21:45,102 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 43 treesize of output 19 [2024-09-20 13:21:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 98 proven. 36 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2024-09-20 13:21:45,489 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:21:49,163 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:21:49,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986680553] [2024-09-20 13:21:49,163 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:21:49,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915227858] [2024-09-20 13:21:49,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915227858] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:21:49,163 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:21:49,163 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2024-09-20 13:21:49,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022133751] [2024-09-20 13:21:49,163 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:21:49,163 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-09-20 13:21:49,164 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:21:49,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-09-20 13:21:49,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=626, Unknown=2, NotChecked=0, Total=702 [2024-09-20 13:21:49,164 INFO L87 Difference]: Start difference. First operand 81 states and 88 transitions. Second operand has 23 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 19 states have internal predecessors, (35), 10 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (11), 7 states have call predecessors, (11), 9 states have call successors, (11) [2024-09-20 13:21:59,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:21:59,345 INFO L93 Difference]: Finished difference Result 105 states and 113 transitions. [2024-09-20 13:21:59,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-09-20 13:21:59,345 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 19 states have internal predecessors, (35), 10 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (11), 7 states have call predecessors, (11), 9 states have call successors, (11) Word has length 88 [2024-09-20 13:21:59,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:21:59,347 INFO L225 Difference]: With dead ends: 105 [2024-09-20 13:21:59,348 INFO L226 Difference]: Without dead ends: 101 [2024-09-20 13:21:59,348 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=246, Invalid=1821, Unknown=3, NotChecked=0, Total=2070 [2024-09-20 13:21:59,352 INFO L434 NwaCegarLoop]: 16 mSDtfsCounter, 39 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 30 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2024-09-20 13:21:59,352 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 102 Invalid, 632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 592 Invalid, 10 Unknown, 0 Unchecked, 3.1s Time] [2024-09-20 13:21:59,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2024-09-20 13:21:59,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 99. [2024-09-20 13:21:59,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (23), 19 states have call predecessors, (23), 17 states have call successors, (23) [2024-09-20 13:21:59,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2024-09-20 13:21:59,428 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 88 [2024-09-20 13:21:59,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:21:59,428 INFO L474 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2024-09-20 13:21:59,429 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 19 states have internal predecessors, (35), 10 states have call successors, (13), 6 states have call predecessors, (13), 7 states have return successors, (11), 7 states have call predecessors, (11), 9 states have call successors, (11) [2024-09-20 13:21:59,429 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:59,429 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2024-09-20 13:21:59,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2024-09-20 13:21:59,430 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:21:59,430 INFO L216 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:21:59,446 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-09-20 13:21:59,631 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-09-20 13:21:59,631 INFO L399 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:21:59,631 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:21:59,631 INFO L85 PathProgramCache]: Analyzing trace with hash -42363038, now seen corresponding path program 3 times [2024-09-20 13:21:59,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:21:59,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086612746] [2024-09-20 13:21:59,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:21:59,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:21:59,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:21:59,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [371551858] [2024-09-20 13:21:59,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-09-20 13:21:59,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:21:59,662 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:21:59,667 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) [2024-09-20 13:21:59,670 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-09-20 13:21:59,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-09-20 13:21:59,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-20 13:21:59,837 INFO L262 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 157 conjuncts are in the unsatisfiable core [2024-09-20 13:21:59,841 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:21:59,894 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 [2024-09-20 13:21:59,913 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 [2024-09-20 13:21:59,931 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 [2024-09-20 13:22:02,986 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 [2024-09-20 13:22:03,004 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 [2024-09-20 13:22:03,720 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 72 proven. 43 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2024-09-20 13:22:03,720 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:22:08,936 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 35 treesize of output 31 [2024-09-20 13:22:26,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:22:26,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086612746] [2024-09-20 13:22:26,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:22:26,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371551858] [2024-09-20 13:22:26,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371551858] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:22:26,845 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:22:26,845 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2024-09-20 13:22:26,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745007261] [2024-09-20 13:22:26,845 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:22:26,845 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-09-20 13:22:26,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:22:26,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-09-20 13:22:26,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2024-09-20 13:22:26,846 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 16 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 8 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2024-09-20 13:22:29,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:22:29,746 INFO L93 Difference]: Finished difference Result 123 states and 133 transitions. [2024-09-20 13:22:29,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-09-20 13:22:29,747 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 8 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) Word has length 112 [2024-09-20 13:22:29,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:22:29,748 INFO L225 Difference]: With dead ends: 123 [2024-09-20 13:22:29,748 INFO L226 Difference]: Without dead ends: 119 [2024-09-20 13:22:29,748 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2024-09-20 13:22:29,748 INFO L434 NwaCegarLoop]: 25 mSDtfsCounter, 23 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 20 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2024-09-20 13:22:29,749 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 125 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 571 Invalid, 3 Unknown, 0 Unchecked, 2.3s Time] [2024-09-20 13:22:29,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2024-09-20 13:22:29,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 101. [2024-09-20 13:22:29,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 20 states have call successors, (20), 16 states have call predecessors, (20), 16 states have return successors, (26), 20 states have call predecessors, (26), 17 states have call successors, (26) [2024-09-20 13:22:29,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 112 transitions. [2024-09-20 13:22:29,810 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 112 transitions. Word has length 112 [2024-09-20 13:22:29,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:22:29,811 INFO L474 AbstractCegarLoop]: Abstraction has 101 states and 112 transitions. [2024-09-20 13:22:29,811 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.5) internal successors, (30), 14 states have internal predecessors, (30), 8 states have call successors, (13), 5 states have call predecessors, (13), 6 states have return successors, (12), 7 states have call predecessors, (12), 7 states have call successors, (12) [2024-09-20 13:22:29,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:22:29,811 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 112 transitions. [2024-09-20 13:22:29,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2024-09-20 13:22:29,813 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:22:29,814 INFO L216 NwaCegarLoop]: trace histogram [17, 16, 16, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:22:29,827 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-09-20 13:22:30,014 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:22:30,015 INFO L399 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:22:30,015 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:22:30,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1115426367, now seen corresponding path program 4 times [2024-09-20 13:22:30,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:22:30,016 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961959726] [2024-09-20 13:22:30,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:22:30,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:22:30,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:22:30,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [13773004] [2024-09-20 13:22:30,076 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-09-20 13:22:30,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:22:30,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:22:30,081 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) [2024-09-20 13:22:30,082 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-09-20 13:22:30,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-09-20 13:22:30,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-20 13:22:30,273 INFO L262 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 148 conjuncts are in the unsatisfiable core [2024-09-20 13:22:30,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:22:32,197 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 [2024-09-20 13:22:32,208 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 33 treesize of output 21 [2024-09-20 13:22:32,218 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 33 treesize of output 21 [2024-09-20 13:22:34,253 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-09-20 13:22:34,253 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 31 treesize of output 35 [2024-09-20 13:22:34,834 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 34 treesize of output 26 [2024-09-20 13:22:34,844 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 17 [2024-09-20 13:22:35,221 INFO L134 CoverageAnalysis]: Checked inductivity of 628 backedges. 339 proven. 89 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2024-09-20 13:22:35,221 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:22:41,576 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-09-20 13:22:41,576 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 148 treesize of output 107 [2024-09-20 13:22:41,589 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 98 treesize of output 90 [2024-09-20 13:22:41,604 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 12 treesize of output 8 [2024-09-20 13:22:43,954 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-09-20 13:22:43,954 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 148 treesize of output 107 [2024-09-20 13:22:43,966 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 98 treesize of output 90 [2024-09-20 13:22:43,978 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 12 treesize of output 8 [2024-09-20 13:22:45,701 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-09-20 13:22:45,702 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 148 treesize of output 107 [2024-09-20 13:22:45,713 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 98 treesize of output 90 [2024-09-20 13:22:45,725 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 12 treesize of output 8 [2024-09-20 13:22:47,769 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:22:47,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961959726] [2024-09-20 13:22:47,773 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:22:47,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13773004] [2024-09-20 13:22:47,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13773004] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:22:47,773 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:22:47,773 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2024-09-20 13:22:47,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812676969] [2024-09-20 13:22:47,773 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:22:47,774 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-09-20 13:22:47,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:22:47,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-09-20 13:22:47,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2024-09-20 13:22:47,775 INFO L87 Difference]: Start difference. First operand 101 states and 112 transitions. Second operand has 24 states, 20 states have (on average 2.5) internal successors, (50), 21 states have internal predecessors, (50), 10 states have call successors, (20), 6 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 9 states have call successors, (18) [2024-09-20 13:22:52,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-20 13:22:52,220 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2024-09-20 13:22:52,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-09-20 13:22:52,221 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 20 states have (on average 2.5) internal successors, (50), 21 states have internal predecessors, (50), 10 states have call successors, (20), 6 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 9 states have call successors, (18) Word has length 136 [2024-09-20 13:22:52,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-20 13:22:52,221 INFO L225 Difference]: With dead ends: 107 [2024-09-20 13:22:52,222 INFO L226 Difference]: Without dead ends: 103 [2024-09-20 13:22:52,222 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 134 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=287, Invalid=1435, Unknown=0, NotChecked=0, Total=1722 [2024-09-20 13:22:52,222 INFO L434 NwaCegarLoop]: 14 mSDtfsCounter, 58 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2024-09-20 13:22:52,223 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 92 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2024-09-20 13:22:52,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2024-09-20 13:22:52,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 83. [2024-09-20 13:22:52,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 53 states have (on average 1.0188679245283019) internal successors, (54), 53 states have internal predecessors, (54), 17 states have call successors, (17), 14 states have call predecessors, (17), 12 states have return successors, (18), 15 states have call predecessors, (18), 15 states have call successors, (18) [2024-09-20 13:22:52,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2024-09-20 13:22:52,271 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 136 [2024-09-20 13:22:52,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-20 13:22:52,273 INFO L474 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2024-09-20 13:22:52,273 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 20 states have (on average 2.5) internal successors, (50), 21 states have internal predecessors, (50), 10 states have call successors, (20), 6 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 9 states have call successors, (18) [2024-09-20 13:22:52,273 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:22:52,273 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2024-09-20 13:22:52,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2024-09-20 13:22:52,274 INFO L208 NwaCegarLoop]: Found error trace [2024-09-20 13:22:52,274 INFO L216 NwaCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-20 13:22:52,288 INFO L552 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-09-20 13:22:52,478 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-09-20 13:22:52,479 INFO L399 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-20 13:22:52,479 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-20 13:22:52,479 INFO L85 PathProgramCache]: Analyzing trace with hash 344499176, now seen corresponding path program 2 times [2024-09-20 13:22:52,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-09-20 13:22:52,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871917829] [2024-09-20 13:22:52,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-20 13:22:52,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-09-20 13:22:52,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-09-20 13:22:52,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [764412917] [2024-09-20 13:22:52,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-09-20 13:22:52,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-09-20 13:22:52,504 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-20 13:22:52,505 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) [2024-09-20 13:22:52,506 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-09-20 13:22:52,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-09-20 13:22:52,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2024-09-20 13:22:52,648 INFO L262 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 159 conjuncts are in the unsatisfiable core [2024-09-20 13:22:52,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-20 13:22:52,670 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 [2024-09-20 13:22:52,681 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 11 treesize of output 7 [2024-09-20 13:22:52,709 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 [2024-09-20 13:23:30,034 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 [2024-09-20 13:23:30,079 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 36 treesize of output 13 [2024-09-20 13:23:30,122 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 [2024-09-20 13:23:31,329 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 65 proven. 173 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2024-09-20 13:23:31,329 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-20 13:24:23,920 WARN L293 SmtUtils]: Spent 8.12s on a formula simplification that was a NOOP. DAG size: 86 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-09-20 13:24:23,921 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-09-20 13:24:23,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871917829] [2024-09-20 13:24:23,921 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-09-20 13:24:23,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764412917] [2024-09-20 13:24:23,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764412917] provided 0 perfect and 1 imperfect interpolant sequences [2024-09-20 13:24:23,922 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-09-20 13:24:23,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2024-09-20 13:24:23,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020038176] [2024-09-20 13:24:23,922 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-09-20 13:24:23,922 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-09-20 13:24:23,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-09-20 13:24:23,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-09-20 13:24:23,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=811, Unknown=5, NotChecked=0, Total=930 [2024-09-20 13:24:23,923 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand has 26 states, 19 states have (on average 2.263157894736842) internal successors, (43), 23 states have internal predecessors, (43), 12 states have call successors, (17), 6 states have call predecessors, (17), 8 states have return successors, (15), 9 states have call predecessors, (15), 11 states have call successors, (15) [2024-09-20 13:24:26,438 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-09-20 13:24:30,468 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-09-20 13:24:35,802 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2024-09-20 13:24:39,820 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2024-09-20 13:24:40,998 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-09-20 13:24:45,043 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-09-20 13:24:49,740 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers []