./Ultimate.py --spec /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/properties/unreach-call.prp --file /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4a390ef5 Calling Ultimate with: /root/.sdkman/candidates/java/current/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/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 8d0e6bdf4ddc5b5e0cadfb452142b6477bf8c78b59a2e6398c4f283004048468 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4a390ef-m [2024-10-24 01:10:07,022 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-10-24 01:10:07,080 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-10-24 01:10:07,086 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-10-24 01:10:07,087 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-10-24 01:10:07,128 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-10-24 01:10:07,129 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-10-24 01:10:07,129 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-10-24 01:10:07,130 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-10-24 01:10:07,131 INFO L153 SettingsManager]: * Use memory slicer=true [2024-10-24 01:10:07,142 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-10-24 01:10:07,143 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-10-24 01:10:07,143 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-10-24 01:10:07,144 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-10-24 01:10:07,146 INFO L153 SettingsManager]: * Use SBE=true [2024-10-24 01:10:07,146 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-10-24 01:10:07,147 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-10-24 01:10:07,147 INFO L153 SettingsManager]: * sizeof long=4 [2024-10-24 01:10:07,147 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-10-24 01:10:07,147 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-10-24 01:10:07,147 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-10-24 01:10:07,149 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-10-24 01:10:07,150 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-10-24 01:10:07,150 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-10-24 01:10:07,150 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-10-24 01:10:07,151 INFO L153 SettingsManager]: * sizeof long double=12 [2024-10-24 01:10:07,151 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-10-24 01:10:07,151 INFO L153 SettingsManager]: * Use constant arrays=true [2024-10-24 01:10:07,151 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-10-24 01:10:07,151 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-10-24 01:10:07,151 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 01:10:07,152 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-10-24 01:10:07,152 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-10-24 01:10:07,153 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-10-24 01:10:07,153 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-10-24 01:10:07,153 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-10-24 01:10:07,155 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-10-24 01:10:07,155 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/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d0e6bdf4ddc5b5e0cadfb452142b6477bf8c78b59a2e6398c4f283004048468 [2024-10-24 01:10:07,378 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-10-24 01:10:07,407 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-10-24 01:10:07,409 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-10-24 01:10:07,410 INFO L270 PluginConnector]: Initializing CDTParser... [2024-10-24 01:10:07,410 INFO L274 PluginConnector]: CDTParser initialized [2024-10-24 01:10:07,411 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i [2024-10-24 01:10:08,729 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-10-24 01:10:08,919 INFO L384 CDTParser]: Found 1 translation units. [2024-10-24 01:10:08,919 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i [2024-10-24 01:10:08,936 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1bfa38c7/85603e81eca94d40819f157c40e38608/FLAG1cfe822cf [2024-10-24 01:10:08,955 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e1bfa38c7/85603e81eca94d40819f157c40e38608 [2024-10-24 01:10:08,958 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-10-24 01:10:08,961 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-10-24 01:10:08,966 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-10-24 01:10:08,966 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-10-24 01:10:08,972 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-10-24 01:10:08,973 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 01:10:08" (1/1) ... [2024-10-24 01:10:08,974 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@548cdfea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:08, skipping insertion in model container [2024-10-24 01:10:08,974 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 01:10:08" (1/1) ... [2024-10-24 01:10:08,999 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-10-24 01:10:09,166 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i[1564,1577] [2024-10-24 01:10:09,189 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 01:10:09,208 INFO L200 MainTranslator]: Completed pre-run [2024-10-24 01:10:09,233 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_divbin.i[1564,1577] [2024-10-24 01:10:09,250 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-10-24 01:10:09,267 INFO L204 MainTranslator]: Completed translation [2024-10-24 01:10:09,268 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09 WrapperNode [2024-10-24 01:10:09,268 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-10-24 01:10:09,269 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-10-24 01:10:09,269 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-10-24 01:10:09,269 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-10-24 01:10:09,276 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,284 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,305 INFO L138 Inliner]: procedures = 19, calls = 63, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 65 [2024-10-24 01:10:09,307 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-10-24 01:10:09,307 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-10-24 01:10:09,308 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-10-24 01:10:09,308 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-10-24 01:10:09,318 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,319 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,321 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,351 INFO L175 MemorySlicer]: Split 36 memory accesses to 6 slices as follows [2, 11, 7, 4, 7, 5]. 31 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0, 0]. The 10 writes are split as follows [0, 3, 2, 1, 3, 1]. [2024-10-24 01:10:09,351 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,352 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,358 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,359 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,360 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,381 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,391 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-10-24 01:10:09,393 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-10-24 01:10:09,393 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-10-24 01:10:09,393 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-10-24 01:10:09,394 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (1/1) ... [2024-10-24 01:10:09,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-10-24 01:10:09,410 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:09,434 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-10-24 01:10:09,440 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-10-24 01:10:09,480 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_35_to_37_0 [2024-10-24 01:10:09,480 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_35_to_37_0 [2024-10-24 01:10:09,481 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-10-24 01:10:09,481 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-10-24 01:10:09,481 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-10-24 01:10:09,481 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-10-24 01:10:09,481 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-10-24 01:10:09,482 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-10-24 01:10:09,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-10-24 01:10:09,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-10-24 01:10:09,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#5 [2024-10-24 01:10:09,483 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-10-24 01:10:09,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#5 [2024-10-24 01:10:09,484 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_39_to_46_0 [2024-10-24 01:10:09,484 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_39_to_46_0 [2024-10-24 01:10:09,485 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-10-24 01:10:09,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-10-24 01:10:09,485 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#5 [2024-10-24 01:10:09,493 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-10-24 01:10:09,494 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-10-24 01:10:09,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-10-24 01:10:09,585 INFO L238 CfgBuilder]: Building ICFG [2024-10-24 01:10:09,587 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-10-24 01:10:09,810 INFO L? ?]: Removed 9 outVars from TransFormulas that were not future-live. [2024-10-24 01:10:09,810 INFO L287 CfgBuilder]: Performing block encoding [2024-10-24 01:10:09,840 INFO L309 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-10-24 01:10:09,840 INFO L314 CfgBuilder]: Removed 2 assume(true) statements. [2024-10-24 01:10:09,840 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 01:10:09 BoogieIcfgContainer [2024-10-24 01:10:09,842 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-10-24 01:10:09,844 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-10-24 01:10:09,845 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-10-24 01:10:09,847 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-10-24 01:10:09,848 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 01:10:08" (1/3) ... [2024-10-24 01:10:09,848 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1116dcfa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 01:10:09, skipping insertion in model container [2024-10-24 01:10:09,848 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 01:10:09" (2/3) ... [2024-10-24 01:10:09,849 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1116dcfa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 01:10:09, skipping insertion in model container [2024-10-24 01:10:09,849 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 01:10:09" (3/3) ... [2024-10-24 01:10:09,850 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_divbin.i [2024-10-24 01:10:09,862 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-10-24 01:10:09,863 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-10-24 01:10:09,919 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-10-24 01:10:09,924 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;@24607fcf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-10-24 01:10:09,924 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-10-24 01:10:09,927 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 25 states have internal predecessors, (30), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2024-10-24 01:10:09,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-10-24 01:10:09,933 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:09,934 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 01:10:09,934 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:09,938 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:09,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1748369764, now seen corresponding path program 1 times [2024-10-24 01:10:09,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:09,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598717824] [2024-10-24 01:10:09,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:09,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:10,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:10,156 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2024-10-24 01:10:10,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:10,167 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2024-10-24 01:10:10,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:10,190 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2024-10-24 01:10:10,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:10,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 01:10:10,203 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:10,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598717824] [2024-10-24 01:10:10,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598717824] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 01:10:10,204 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 01:10:10,204 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-10-24 01:10:10,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377677525] [2024-10-24 01:10:10,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 01:10:10,210 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-10-24 01:10:10,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:10,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-10-24 01:10:10,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 01:10:10,230 INFO L87 Difference]: Start difference. First operand has 36 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 25 states have internal predecessors, (30), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 01:10:10,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:10,330 INFO L93 Difference]: Finished difference Result 74 states and 103 transitions. [2024-10-24 01:10:10,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-10-24 01:10:10,333 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2024-10-24 01:10:10,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:10,339 INFO L225 Difference]: With dead ends: 74 [2024-10-24 01:10:10,339 INFO L226 Difference]: Without dead ends: 38 [2024-10-24 01:10:10,342 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-10-24 01:10:10,344 INFO L432 NwaCegarLoop]: 26 mSDtfsCounter, 17 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:10,347 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 30 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-10-24 01:10:10,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-10-24 01:10:10,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 34. [2024-10-24 01:10:10,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 24 states have internal predecessors, (25), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2024-10-24 01:10:10,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2024-10-24 01:10:10,393 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 25 [2024-10-24 01:10:10,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:10,393 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2024-10-24 01:10:10,393 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 01:10:10,393 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2024-10-24 01:10:10,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-10-24 01:10:10,395 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:10,395 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 01:10:10,395 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-10-24 01:10:10,395 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:10,396 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:10,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1704517573, now seen corresponding path program 1 times [2024-10-24 01:10:10,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:10,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942991172] [2024-10-24 01:10:10,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:10,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:10,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 01:10:10,500 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1478618064] [2024-10-24 01:10:10,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:10,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:10,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:10,502 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 01:10:10,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-10-24 01:10:10,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:10,665 INFO L255 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 49 conjuncts are in the unsatisfiable core [2024-10-24 01:10:10,670 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 01:10:10,705 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:10,717 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:10,721 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:10,862 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-24 01:10:10,868 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-10-24 01:10:10,917 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 01:10:10,917 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-10-24 01:10:10,918 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:10,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942991172] [2024-10-24 01:10:10,918 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 01:10:10,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478618064] [2024-10-24 01:10:10,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478618064] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 01:10:10,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 01:10:10,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2024-10-24 01:10:10,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070752736] [2024-10-24 01:10:10,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 01:10:10,922 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2024-10-24 01:10:10,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:10,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2024-10-24 01:10:10,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2024-10-24 01:10:10,924 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 01:10:11,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:11,211 INFO L93 Difference]: Finished difference Result 62 states and 73 transitions. [2024-10-24 01:10:11,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-10-24 01:10:11,212 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2024-10-24 01:10:11,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:11,214 INFO L225 Difference]: With dead ends: 62 [2024-10-24 01:10:11,214 INFO L226 Difference]: Without dead ends: 58 [2024-10-24 01:10:11,214 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2024-10-24 01:10:11,215 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 32 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:11,218 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 200 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 01:10:11,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-10-24 01:10:11,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 51. [2024-10-24 01:10:11,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 36 states have internal predecessors, (39), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (11), 10 states have call predecessors, (11), 9 states have call successors, (11) [2024-10-24 01:10:11,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2024-10-24 01:10:11,231 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 26 [2024-10-24 01:10:11,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:11,231 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2024-10-24 01:10:11,231 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-10-24 01:10:11,232 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2024-10-24 01:10:11,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2024-10-24 01:10:11,234 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:11,234 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 01:10:11,241 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-10-24 01:10:11,434 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:11,435 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:11,436 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:11,436 INFO L85 PathProgramCache]: Analyzing trace with hash 868041319, now seen corresponding path program 1 times [2024-10-24 01:10:11,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:11,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160972574] [2024-10-24 01:10:11,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:11,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:11,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 01:10:11,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1700572112] [2024-10-24 01:10:11,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:11,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:11,498 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:11,500 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 01:10:11,503 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-10-24 01:10:11,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:11,713 INFO L255 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 69 conjuncts are in the unsatisfiable core [2024-10-24 01:10:11,717 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 01:10:11,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:11,733 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:11,738 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:11,925 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:11,925 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 32 [2024-10-24 01:10:13,214 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:13,215 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 30 [2024-10-24 01:10:13,226 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:13,227 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 40 treesize of output 36 [2024-10-24 01:10:13,297 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 01:10:13,299 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 01:10:14,750 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:14,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160972574] [2024-10-24 01:10:14,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 01:10:14,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700572112] [2024-10-24 01:10:14,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700572112] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 01:10:14,751 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-24 01:10:14,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2024-10-24 01:10:14,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961512553] [2024-10-24 01:10:14,751 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-24 01:10:14,752 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-10-24 01:10:14,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:14,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-10-24 01:10:14,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2024-10-24 01:10:14,753 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 18 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-24 01:10:18,779 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 01:10:22,853 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 01:10:26,973 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 01:10:30,985 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 01:10:32,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:32,233 INFO L93 Difference]: Finished difference Result 66 states and 76 transitions. [2024-10-24 01:10:32,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-10-24 01:10:32,234 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 36 [2024-10-24 01:10:32,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:32,235 INFO L225 Difference]: With dead ends: 66 [2024-10-24 01:10:32,235 INFO L226 Difference]: Without dead ends: 60 [2024-10-24 01:10:32,236 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=221, Invalid=1339, Unknown=0, NotChecked=0, Total=1560 [2024-10-24 01:10:32,240 INFO L432 NwaCegarLoop]: 22 mSDtfsCounter, 52 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 26 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.6s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:32,241 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 197 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 403 Invalid, 7 Unknown, 0 Unchecked, 16.6s Time] [2024-10-24 01:10:32,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2024-10-24 01:10:32,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 55. [2024-10-24 01:10:32,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 38 states have internal predecessors, (41), 11 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (13), 10 states have call predecessors, (13), 9 states have call successors, (13) [2024-10-24 01:10:32,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2024-10-24 01:10:32,252 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 36 [2024-10-24 01:10:32,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:32,253 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2024-10-24 01:10:32,253 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-24 01:10:32,253 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2024-10-24 01:10:32,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2024-10-24 01:10:32,254 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:32,254 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 01:10:32,261 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-10-24 01:10:32,458 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2024-10-24 01:10:32,459 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:32,459 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:32,459 INFO L85 PathProgramCache]: Analyzing trace with hash 2023334893, now seen corresponding path program 1 times [2024-10-24 01:10:32,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:32,459 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64758990] [2024-10-24 01:10:32,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:32,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:32,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:33,097 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2024-10-24 01:10:33,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:33,100 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2024-10-24 01:10:33,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:33,115 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2024-10-24 01:10:33,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:33,282 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2024-10-24 01:10:33,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:33,292 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 01:10:33,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:33,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64758990] [2024-10-24 01:10:33,293 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64758990] provided 1 perfect and 0 imperfect interpolant sequences [2024-10-24 01:10:33,293 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-10-24 01:10:33,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2024-10-24 01:10:33,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708331320] [2024-10-24 01:10:33,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-10-24 01:10:33,294 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-10-24 01:10:33,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:33,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-10-24 01:10:33,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2024-10-24 01:10:33,296 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-24 01:10:33,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:33,616 INFO L93 Difference]: Finished difference Result 103 states and 122 transitions. [2024-10-24 01:10:33,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-10-24 01:10:33,616 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2024-10-24 01:10:33,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:33,617 INFO L225 Difference]: With dead ends: 103 [2024-10-24 01:10:33,617 INFO L226 Difference]: Without dead ends: 57 [2024-10-24 01:10:33,618 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2024-10-24 01:10:33,618 INFO L432 NwaCegarLoop]: 19 mSDtfsCounter, 29 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:33,618 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 84 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-10-24 01:10:33,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2024-10-24 01:10:33,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2024-10-24 01:10:33,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 39 states have internal predecessors, (42), 11 states have call successors, (11), 7 states have call predecessors, (11), 9 states have return successors, (14), 10 states have call predecessors, (14), 9 states have call successors, (14) [2024-10-24 01:10:33,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2024-10-24 01:10:33,636 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 37 [2024-10-24 01:10:33,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:33,637 INFO L471 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2024-10-24 01:10:33,637 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2024-10-24 01:10:33,637 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2024-10-24 01:10:33,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-10-24 01:10:33,638 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:33,638 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-10-24 01:10:33,638 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-10-24 01:10:33,638 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:33,638 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:33,639 INFO L85 PathProgramCache]: Analyzing trace with hash 64174150, now seen corresponding path program 1 times [2024-10-24 01:10:33,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:33,639 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516306296] [2024-10-24 01:10:33,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:33,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:33,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 01:10:33,703 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1166157174] [2024-10-24 01:10:33,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:33,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:33,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:33,707 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 01:10:33,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-10-24 01:10:34,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:34,027 INFO L255 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 154 conjuncts are in the unsatisfiable core [2024-10-24 01:10:34,034 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 01:10:34,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:34,055 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:34,063 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:34,140 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 [2024-10-24 01:10:34,850 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 30 [2024-10-24 01:10:34,886 INFO L349 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2024-10-24 01:10:34,887 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-24 01:10:34,959 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-24 01:10:34,960 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-24 01:10:34,993 INFO L349 Elim1Store]: treesize reduction 22, result has 56.0 percent of original size [2024-10-24 01:10:34,993 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 63 treesize of output 68 [2024-10-24 01:10:35,328 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:35,328 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 127 treesize of output 167 [2024-10-24 01:10:35,390 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:35,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 159 treesize of output 227 [2024-10-24 01:10:35,407 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 154 treesize of output 110 [2024-10-24 01:10:35,589 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-10-24 01:10:35,589 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 01:10:36,755 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 50 treesize of output 42 [2024-10-24 01:10:36,926 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:36,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516306296] [2024-10-24 01:10:36,926 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-10-24 01:10:36,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166157174] [2024-10-24 01:10:36,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166157174] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 01:10:36,927 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-10-24 01:10:36,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-10-24 01:10:36,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478707257] [2024-10-24 01:10:36,927 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-10-24 01:10:36,928 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-10-24 01:10:36,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:36,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-10-24 01:10:36,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2024-10-24 01:10:36,929 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 21 states, 17 states have (on average 1.588235294117647) internal successors, (27), 15 states have internal predecessors, (27), 7 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-24 01:10:38,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:38,590 INFO L93 Difference]: Finished difference Result 88 states and 103 transitions. [2024-10-24 01:10:38,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-10-24 01:10:38,591 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 1.588235294117647) internal successors, (27), 15 states have internal predecessors, (27), 7 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 43 [2024-10-24 01:10:38,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:38,592 INFO L225 Difference]: With dead ends: 88 [2024-10-24 01:10:38,592 INFO L226 Difference]: Without dead ends: 84 [2024-10-24 01:10:38,593 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=154, Invalid=1178, Unknown=0, NotChecked=0, Total=1332 [2024-10-24 01:10:38,593 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 63 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 23 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:38,593 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 216 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 473 Invalid, 1 Unknown, 0 Unchecked, 1.0s Time] [2024-10-24 01:10:38,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2024-10-24 01:10:38,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2024-10-24 01:10:38,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 53 states have (on average 1.150943396226415) internal successors, (61), 56 states have internal predecessors, (61), 14 states have call successors, (14), 11 states have call predecessors, (14), 13 states have return successors, (19), 13 states have call predecessors, (19), 12 states have call successors, (19) [2024-10-24 01:10:38,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 94 transitions. [2024-10-24 01:10:38,609 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 94 transitions. Word has length 43 [2024-10-24 01:10:38,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:38,609 INFO L471 AbstractCegarLoop]: Abstraction has 81 states and 94 transitions. [2024-10-24 01:10:38,609 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 1.588235294117647) internal successors, (27), 15 states have internal predecessors, (27), 7 states have call successors, (8), 7 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2024-10-24 01:10:38,610 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 94 transitions. [2024-10-24 01:10:38,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-10-24 01:10:38,611 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:38,611 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 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] [2024-10-24 01:10:38,618 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-10-24 01:10:38,814 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:38,815 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:38,815 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:38,815 INFO L85 PathProgramCache]: Analyzing trace with hash -2088984372, now seen corresponding path program 2 times [2024-10-24 01:10:38,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:38,816 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706614769] [2024-10-24 01:10:38,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:38,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:38,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,118 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2024-10-24 01:10:40,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,120 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2024-10-24 01:10:40,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,134 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2024-10-24 01:10:40,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,351 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2024-10-24 01:10:40,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,571 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2024-10-24 01:10:40,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,575 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2024-10-24 01:10:40,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:40,583 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-10-24 01:10:40,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-10-24 01:10:40,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706614769] [2024-10-24 01:10:40,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1706614769] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 01:10:40,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323318913] [2024-10-24 01:10:40,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-10-24 01:10:40,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:40,583 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:40,586 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 01:10:40,587 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-10-24 01:10:41,005 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-10-24 01:10:41,005 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-10-24 01:10:41,014 INFO L255 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 199 conjuncts are in the unsatisfiable core [2024-10-24 01:10:41,023 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 01:10:41,034 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:41,039 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:41,229 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:41,235 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:41,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:41,288 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:41,672 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 29 treesize of output 17 [2024-10-24 01:10:42,270 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2024-10-24 01:10:42,271 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 21 [2024-10-24 01:10:42,280 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 21 [2024-10-24 01:10:42,396 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:42,397 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 38 treesize of output 38 [2024-10-24 01:10:42,436 INFO L349 Elim1Store]: treesize reduction 21, result has 34.4 percent of original size [2024-10-24 01:10:42,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 25 [2024-10-24 01:10:42,944 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:42,944 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 39 treesize of output 35 [2024-10-24 01:10:43,025 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 68 treesize of output 40 [2024-10-24 01:10:43,030 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-10-24 01:10:43,030 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 01:10:44,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323318913] provided 0 perfect and 1 imperfect interpolant sequences [2024-10-24 01:10:44,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-10-24 01:10:44,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 22] total 39 [2024-10-24 01:10:44,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038481319] [2024-10-24 01:10:44,008 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-10-24 01:10:44,009 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2024-10-24 01:10:44,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-10-24 01:10:44,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2024-10-24 01:10:44,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2094, Unknown=0, NotChecked=0, Total=2256 [2024-10-24 01:10:44,010 INFO L87 Difference]: Start difference. First operand 81 states and 94 transitions. Second operand has 39 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 32 states have internal predecessors, (64), 15 states have call successors, (18), 11 states have call predecessors, (18), 9 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2024-10-24 01:10:48,036 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-10-24 01:10:51,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-10-24 01:10:51,065 INFO L93 Difference]: Finished difference Result 168 states and 194 transitions. [2024-10-24 01:10:51,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2024-10-24 01:10:51,066 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 32 states have internal predecessors, (64), 15 states have call successors, (18), 11 states have call predecessors, (18), 9 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) Word has length 54 [2024-10-24 01:10:51,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-10-24 01:10:51,067 INFO L225 Difference]: With dead ends: 168 [2024-10-24 01:10:51,067 INFO L226 Difference]: Without dead ends: 128 [2024-10-24 01:10:51,068 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=379, Invalid=4591, Unknown=0, NotChecked=0, Total=4970 [2024-10-24 01:10:51,069 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 107 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 1221 mSolverCounterSat, 40 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 1265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1221 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2024-10-24 01:10:51,069 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 122 Invalid, 1265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1221 Invalid, 4 Unknown, 0 Unchecked, 5.5s Time] [2024-10-24 01:10:51,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2024-10-24 01:10:51,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2024-10-24 01:10:51,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 79 states have (on average 1.1139240506329113) internal successors, (88), 83 states have internal predecessors, (88), 20 states have call successors, (20), 17 states have call predecessors, (20), 20 states have return successors, (27), 19 states have call predecessors, (27), 18 states have call successors, (27) [2024-10-24 01:10:51,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 135 transitions. [2024-10-24 01:10:51,113 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 135 transitions. Word has length 54 [2024-10-24 01:10:51,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-10-24 01:10:51,113 INFO L471 AbstractCegarLoop]: Abstraction has 120 states and 135 transitions. [2024-10-24 01:10:51,114 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 32 states have internal predecessors, (64), 15 states have call successors, (18), 11 states have call predecessors, (18), 9 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2024-10-24 01:10:51,114 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 135 transitions. [2024-10-24 01:10:51,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-10-24 01:10:51,115 INFO L207 NwaCegarLoop]: Found error trace [2024-10-24 01:10:51,115 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 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, 1, 1, 1] [2024-10-24 01:10:51,130 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-10-24 01:10:51,319 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:51,320 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-10-24 01:10:51,320 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-10-24 01:10:51,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1850089120, now seen corresponding path program 1 times [2024-10-24 01:10:51,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-10-24 01:10:51,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194799895] [2024-10-24 01:10:51,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:51,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-10-24 01:10:51,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-10-24 01:10:51,356 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1417984490] [2024-10-24 01:10:51,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-10-24 01:10:51,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-10-24 01:10:51,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-10-24 01:10:51,358 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-10-24 01:10:51,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-10-24 01:10:51,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-10-24 01:10:52,003 INFO L255 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 171 conjuncts are in the unsatisfiable core [2024-10-24 01:10:52,007 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-10-24 01:10:52,011 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:52,013 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-10-24 01:10:52,045 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:52,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:52,055 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:52,077 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-10-24 01:10:52,237 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-10-24 01:10:52,490 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:10:52,490 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 47 treesize of output 43 [2024-10-24 01:10:52,501 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 27 treesize of output 19 [2024-10-24 01:11:30,680 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-10-24 01:11:31,959 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:11:31,959 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 58 treesize of output 74 [2024-10-24 01:11:32,039 INFO L349 Elim1Store]: treesize reduction 29, result has 34.1 percent of original size [2024-10-24 01:11:32,039 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 29 [2024-10-24 01:11:32,132 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 29 treesize of output 21 [2024-10-24 01:11:32,137 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 23 [2024-10-24 01:11:32,148 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:11:32,148 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 57 treesize of output 45 [2024-10-24 01:11:32,306 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-10-24 01:11:32,306 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-10-24 01:11:36,188 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-10-24 01:11:36,189 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 59