./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4f9af400 extending candidate: java ['java'] extending candidate: /usr/bin/java ['java', '/usr/bin/java'] extending candidate: /opt/oracle-jdk-bin-*/bin/java ['java', '/usr/bin/java'] extending candidate: /opt/openjdk-*/bin/java ['java', '/usr/bin/java'] extending candidate: /usr/lib/jvm/java-*-openjdk-amd64/bin/java ['java', '/usr/bin/java', '/usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java', '/usr/lib/jvm/java-17-openjdk-amd64/bin/java', '/usr/lib/jvm/java-11-openjdk-amd64/bin/java', '/usr/lib/jvm/java-1.17.0-openjdk-amd64/bin/java'] ['/root/.sdkman/candidates/java/21.0.5-tem/bin/java', '-Dosgi.configuration.area=/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/config', '-Xmx15G', '-Xms4m', '-jar', '/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar', '-data', '@noDefault', '-ultimatedata', '/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data', '-tc', '/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml', '-i', '../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c', '-s', '/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf', '--cacsl2boogietranslator.entry.function', 'main', '--witnessprinter.witness.directory', '/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux', '--witnessprinter.witness.filename', 'witness', '--witnessprinter.write.witness.besides.input.file', 'false', '--witnessprinter.graph.data.specification', 'CHECK( init(main()), LTL(G ! call(reach_error())) )\n\n', '--witnessprinter.graph.data.producer', 'Automizer', '--witnessprinter.graph.data.architecture', '32bit', '--witnessprinter.graph.data.programhash', '9ae1eacd45e2434e505261d43bb17259916099964617682d271ef41fa1c24d0c'] Calling Ultimate with: /root/.sdkman/candidates/java/21.0.5-tem/bin/java -Dosgi.configuration.area=/storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c -s /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux --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 9ae1eacd45e2434e505261d43bb17259916099964617682d271ef41fa1c24d0c --- Real Ultimate output --- This is Ultimate 0.3.0-?-4f9af40 [2024-11-06 23:53:01,692 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-06 23:53:01,797 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-11-06 23:53:01,801 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-06 23:53:01,802 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-06 23:53:01,821 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-06 23:53:01,822 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-06 23:53:01,822 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-06 23:53:01,822 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-11-06 23:53:01,823 INFO L153 SettingsManager]: * Use memory slicer=true [2024-11-06 23:53:01,824 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-06 23:53:01,824 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-06 23:53:01,824 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-06 23:53:01,824 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-06 23:53:01,824 INFO L153 SettingsManager]: * Use SBE=true [2024-11-06 23:53:01,824 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-06 23:53:01,825 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-06 23:53:01,825 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-06 23:53:01,826 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-06 23:53:01,827 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-06 23:53:01,827 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-06 23:53:01,827 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-06 23:53:01,827 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-06 23:53:01,827 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-06 23:53:01,828 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-06 23:53:01,828 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-06 23:53:01,828 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-06 23:53:01,828 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-06 23:53:01,828 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-06 23:53:01,829 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-06 23:53:01,829 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-06 23:53:01,829 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-06 23:53:01,829 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-06 23:53:01,829 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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/ultimate-jdk21/releaseScripts/default/UAutomizer-linux 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 -> 9ae1eacd45e2434e505261d43bb17259916099964617682d271ef41fa1c24d0c [2024-11-06 23:53:02,072 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-06 23:53:02,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-06 23:53:02,082 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-06 23:53:02,085 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-06 23:53:02,085 INFO L274 PluginConnector]: CDTParser initialized [2024-11-06 23:53:02,087 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c [2024-11-06 23:53:03,409 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-06 23:53:03,655 INFO L384 CDTParser]: Found 1 translation units. [2024-11-06 23:53:03,656 INFO L180 CDTParser]: Scanning /storage/repos/ultimate-jdk21/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c [2024-11-06 23:53:03,664 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/0562ff52d/dbc4a88a27e04eca8f082ae5a70d938e/FLAG15b719db5 [2024-11-06 23:53:03,686 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/data/0562ff52d/dbc4a88a27e04eca8f082ae5a70d938e [2024-11-06 23:53:03,690 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-06 23:53:03,691 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-06 23:53:03,692 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-06 23:53:03,692 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-06 23:53:03,696 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-06 23:53:03,697 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,698 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31538406 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03, skipping insertion in model container [2024-11-06 23:53:03,698 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,714 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-06 23:53:03,845 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-jdk21/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c[1060,1073] [2024-11-06 23:53:03,870 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-06 23:53:03,881 INFO L200 MainTranslator]: Completed pre-run [2024-11-06 23:53:03,890 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-jdk21/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_fermat2-ll.c[1060,1073] [2024-11-06 23:53:03,908 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-06 23:53:03,923 INFO L204 MainTranslator]: Completed translation [2024-11-06 23:53:03,924 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03 WrapperNode [2024-11-06 23:53:03,925 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-06 23:53:03,926 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-06 23:53:03,926 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-06 23:53:03,927 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-06 23:53:03,933 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,937 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,957 INFO L138 Inliner]: procedures = 16, calls = 59, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2024-11-06 23:53:03,958 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-06 23:53:03,959 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-06 23:53:03,959 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-06 23:53:03,960 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-06 23:53:03,967 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,968 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,975 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,990 INFO L175 MemorySlicer]: Split 36 memory accesses to 5 slices as follows [2, 6, 8, 10, 10]. 28 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0]. The 8 writes are split as follows [0, 1, 3, 2, 2]. [2024-11-06 23:53:03,994 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:03,996 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,005 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,010 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,014 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,015 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,016 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-06 23:53:04,019 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-06 23:53:04,020 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-06 23:53:04,020 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-06 23:53:04,021 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (1/1) ... [2024-11-06 23:53:04,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-06 23:53:04,044 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2024-11-06 23:53:04,056 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-11-06 23:53:04,058 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-06 23:53:04,076 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_33_to_42_0 [2024-11-06 23:53:04,076 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_33_to_42_0 [2024-11-06 23:53:04,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-06 23:53:04,077 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-06 23:53:04,077 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-06 23:53:04,077 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-06 23:53:04,173 INFO L238 CfgBuilder]: Building ICFG [2024-11-06 23:53:04,175 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-06 23:53:04,344 INFO L? ?]: Removed 9 outVars from TransFormulas that were not future-live. [2024-11-06 23:53:04,345 INFO L287 CfgBuilder]: Performing block encoding [2024-11-06 23:53:04,352 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-06 23:53:04,353 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-06 23:53:04,353 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 11:53:04 BoogieIcfgContainer [2024-11-06 23:53:04,353 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-06 23:53:04,355 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-06 23:53:04,355 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-06 23:53:04,360 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-06 23:53:04,360 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 11:53:03" (1/3) ... [2024-11-06 23:53:04,361 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a58e94a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 11:53:04, skipping insertion in model container [2024-11-06 23:53:04,361 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 11:53:03" (2/3) ... [2024-11-06 23:53:04,361 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a58e94a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 11:53:04, skipping insertion in model container [2024-11-06 23:53:04,361 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 11:53:04" (3/3) ... [2024-11-06 23:53:04,362 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_fermat2-ll.c [2024-11-06 23:53:04,378 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-06 23:53:04,378 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-06 23:53:04,436 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-06 23:53:04,446 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@467fd987, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-06 23:53:04,447 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-06 23:53:04,452 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 23 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2024-11-06 23:53:04,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-06 23:53:04,457 INFO L207 NwaCegarLoop]: Found error trace [2024-11-06 23:53:04,457 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-06 23:53:04,458 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-06 23:53:04,461 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-06 23:53:04,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1120562071, now seen corresponding path program 1 times [2024-11-06 23:53:04,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-06 23:53:04,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696586527] [2024-11-06 23:53:04,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:04,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-06 23:53:04,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:04,646 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-11-06 23:53:04,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:04,663 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-11-06 23:53:04,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:04,681 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-06 23:53:04,682 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-06 23:53:04,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696586527] [2024-11-06 23:53:04,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696586527] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-06 23:53:04,687 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-06 23:53:04,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-06 23:53:04,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548435349] [2024-11-06 23:53:04,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-06 23:53:04,691 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-06 23:53:04,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-06 23:53:04,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-06 23:53:04,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-06 23:53:04,711 INFO L87 Difference]: Start difference. First operand has 32 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 23 states have internal predecessors, (27), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-06 23:53:04,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-06 23:53:04,742 INFO L93 Difference]: Finished difference Result 61 states and 80 transitions. [2024-11-06 23:53:04,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-06 23:53:04,744 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2024-11-06 23:53:04,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-06 23:53:04,748 INFO L225 Difference]: With dead ends: 61 [2024-11-06 23:53:04,749 INFO L226 Difference]: Without dead ends: 28 [2024-11-06 23:53:04,753 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-06 23:53:04,756 INFO L432 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-06 23:53:04,758 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-06 23:53:04,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-06 23:53:04,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-06 23:53:04,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-06 23:53:04,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2024-11-06 23:53:04,793 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2024-11-06 23:53:04,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-06 23:53:04,794 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2024-11-06 23:53:04,794 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-06 23:53:04,794 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2024-11-06 23:53:04,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-06 23:53:04,795 INFO L207 NwaCegarLoop]: Found error trace [2024-11-06 23:53:04,795 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-06 23:53:04,795 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-06 23:53:04,796 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-06 23:53:04,796 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-06 23:53:04,796 INFO L85 PathProgramCache]: Analyzing trace with hash 233278747, now seen corresponding path program 1 times [2024-11-06 23:53:04,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-06 23:53:04,796 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604672011] [2024-11-06 23:53:04,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:04,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-06 23:53:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-06 23:53:04,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1408638746] [2024-11-06 23:53:04,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:04,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-06 23:53:04,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2024-11-06 23:53:04,912 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-06 23:53:04,914 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-06 23:53:05,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:05,100 INFO L255 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 69 conjuncts are in the unsatisfiable core [2024-11-06 23:53:05,110 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-06 23:53:05,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-06 23:53:05,184 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 [2024-11-06 23:53:05,197 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 21 treesize of output 15 [2024-11-06 23:53:05,205 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-06 23:53:05,459 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 35 [2024-11-06 23:53:05,498 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 31 [2024-11-06 23:53:05,509 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 60 treesize of output 36 [2024-11-06 23:53:05,644 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-06 23:53:05,644 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-06 23:53:05,644 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-06 23:53:05,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604672011] [2024-11-06 23:53:05,645 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-06 23:53:05,645 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408638746] [2024-11-06 23:53:05,645 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408638746] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-06 23:53:05,645 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-06 23:53:05,645 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-11-06 23:53:05,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511897856] [2024-11-06 23:53:05,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-06 23:53:05,646 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-06 23:53:05,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-06 23:53:05,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-06 23:53:05,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-11-06 23:53:05,649 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-06 23:53:07,355 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2024-11-06 23:53:08,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-06 23:53:08,194 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2024-11-06 23:53:08,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-06 23:53:08,194 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), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2024-11-06 23:53:08,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-06 23:53:08,196 INFO L225 Difference]: With dead ends: 46 [2024-11-06 23:53:08,196 INFO L226 Difference]: Without dead ends: 44 [2024-11-06 23:53:08,197 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2024-11-06 23:53:08,200 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 15 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-11-06 23:53:08,201 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 137 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-11-06 23:53:08,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2024-11-06 23:53:08,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2024-11-06 23:53:08,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 31 states have internal predecessors, (33), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (11), 7 states have call predecessors, (11), 7 states have call successors, (11) [2024-11-06 23:53:08,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2024-11-06 23:53:08,220 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 21 [2024-11-06 23:53:08,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-06 23:53:08,221 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2024-11-06 23:53:08,221 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.0) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2024-11-06 23:53:08,221 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2024-11-06 23:53:08,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2024-11-06 23:53:08,222 INFO L207 NwaCegarLoop]: Found error trace [2024-11-06 23:53:08,222 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-06 23:53:08,231 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-06 23:53:08,422 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-06 23:53:08,423 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-06 23:53:08,423 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-06 23:53:08,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1965781648, now seen corresponding path program 1 times [2024-11-06 23:53:08,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-06 23:53:08,423 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13337510] [2024-11-06 23:53:08,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:08,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-06 23:53:08,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-06 23:53:08,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1829152136] [2024-11-06 23:53:08,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:08,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-06 23:53:08,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2024-11-06 23:53:08,498 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-06 23:53:08,500 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-06 23:53:08,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:08,602 INFO L255 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 51 conjuncts are in the unsatisfiable core [2024-11-06 23:53:08,608 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-06 23:53:08,736 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 21 treesize of output 15 [2024-11-06 23:53:08,745 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-06 23:53:08,765 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 [2024-11-06 23:53:08,833 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 [2024-11-06 23:53:08,842 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 49 treesize of output 33 [2024-11-06 23:53:09,324 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 99 treesize of output 63 [2024-11-06 23:53:09,363 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-06 23:53:09,363 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 69 treesize of output 65 [2024-11-06 23:53:09,521 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-06 23:53:09,521 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-06 23:53:15,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-06 23:53:15,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13337510] [2024-11-06 23:53:15,852 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-06 23:53:15,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829152136] [2024-11-06 23:53:15,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829152136] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-06 23:53:15,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-06 23:53:15,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2024-11-06 23:53:15,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730375773] [2024-11-06 23:53:15,853 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-06 23:53:15,853 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-06 23:53:15,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-06 23:53:15,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-06 23:53:15,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2024-11-06 23:53:15,854 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 16 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-06 23:53:19,887 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-11-06 23:53:23,620 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.72s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-11-06 23:53:24,947 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-11-06 23:53:26,703 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.38s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0] [2024-11-06 23:53:26,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-06 23:53:26,818 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2024-11-06 23:53:26,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-06 23:53:26,819 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 31 [2024-11-06 23:53:26,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-06 23:53:26,819 INFO L225 Difference]: With dead ends: 57 [2024-11-06 23:53:26,819 INFO L226 Difference]: Without dead ends: 49 [2024-11-06 23:53:26,820 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2024-11-06 23:53:26,821 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2024-11-06 23:53:26,821 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 83 Invalid, 373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 366 Invalid, 1 Unknown, 0 Unchecked, 10.6s Time] [2024-11-06 23:53:26,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2024-11-06 23:53:26,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2024-11-06 23:53:26,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.15625) internal successors, (37), 35 states have internal predecessors, (37), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (11), 7 states have call predecessors, (11), 7 states have call successors, (11) [2024-11-06 23:53:26,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2024-11-06 23:53:26,832 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 31 [2024-11-06 23:53:26,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-06 23:53:26,832 INFO L471 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2024-11-06 23:53:26,832 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-06 23:53:26,832 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2024-11-06 23:53:26,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-06 23:53:26,833 INFO L207 NwaCegarLoop]: Found error trace [2024-11-06 23:53:26,833 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-06 23:53:26,850 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-06 23:53:27,033 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-06 23:53:27,034 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-06 23:53:27,034 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-06 23:53:27,034 INFO L85 PathProgramCache]: Analyzing trace with hash 2118784734, now seen corresponding path program 1 times [2024-11-06 23:53:27,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-06 23:53:27,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140794154] [2024-11-06 23:53:27,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:27,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-06 23:53:27,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-06 23:53:27,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [198252113] [2024-11-06 23:53:27,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-06 23:53:27,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-06 23:53:27,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 [2024-11-06 23:53:27,115 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-06 23:53:27,116 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate-jdk21/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-06 23:53:27,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-06 23:53:27,241 WARN L253 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 123 conjuncts are in the unsatisfiable core [2024-11-06 23:53:27,246 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-06 23:53:27,254 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 [2024-11-06 23:53:27,354 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 21 treesize of output 15 [2024-11-06 23:53:27,359 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-06 23:53:27,380 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 [2024-11-06 23:53:40,262 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 [2024-11-06 23:53:40,274 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 60 treesize of output 44 [2024-11-06 23:53:40,494 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 44 treesize of output 36 [2024-11-06 23:53:40,501 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 108 treesize of output 92 [2024-11-06 23:53:40,507 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 121 treesize of output 77 [2024-11-06 23:53:40,641 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-06 23:53:40,641 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-06 23:53:46,537 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-06 23:53:46,537 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-06 23:53:46,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140794154] [2024-11-06 23:53:46,537 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-06 23:53:46,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198252113] [2024-11-06 23:53:46,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198252113] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-06 23:53:46,537 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-06 23:53:46,537 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11] total 24 [2024-11-06 23:53:46,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184255646] [2024-11-06 23:53:46,538 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-06 23:53:46,538 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-06 23:53:46,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-06 23:53:46,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-06 23:53:46,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=476, Unknown=2, NotChecked=0, Total=552 [2024-11-06 23:53:46,539 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 24 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 19 states have internal predecessors, (39), 11 states have call successors, (12), 8 states have call predecessors, (12), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2024-11-06 23:53:50,807 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.27s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0]