./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursified_nla-digbench/recursified_ps6-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 3061b6dc Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/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 ../sv-benchmarks/c/recursified_nla-digbench/recursified_ps6-ll.c -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 2b375ae29a973823eea93f22f40d893acb563fa864c4860e04525925a120d938 --- Real Ultimate output --- This is Ultimate 0.2.5-tmp.dk.eval-assert-order-craig-3061b6d-m [2024-11-18 14:32:00,916 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-18 14:32:00,988 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-11-18 14:32:00,991 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-18 14:32:00,992 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-18 14:32:01,016 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-18 14:32:01,016 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-18 14:32:01,017 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-18 14:32:01,017 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-11-18 14:32:01,019 INFO L153 SettingsManager]: * Use memory slicer=true [2024-11-18 14:32:01,019 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-18 14:32:01,020 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-18 14:32:01,020 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-18 14:32:01,022 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-18 14:32:01,022 INFO L153 SettingsManager]: * Use SBE=true [2024-11-18 14:32:01,023 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-18 14:32:01,023 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-18 14:32:01,023 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-18 14:32:01,023 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-18 14:32:01,024 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-18 14:32:01,024 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-18 14:32:01,027 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-18 14:32:01,027 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-18 14:32:01,028 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-18 14:32:01,028 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-18 14:32:01,028 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-18 14:32:01,028 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-18 14:32:01,028 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-18 14:32:01,029 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-18 14:32:01,029 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-18 14:32:01,029 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-18 14:32:01,029 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-18 14:32:01,029 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-18 14:32:01,030 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-18 14:32:01,030 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-18 14:32:01,030 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-18 14:32:01,030 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-18 14:32:01,030 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-18 14:32:01,031 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-18 14:32:01,031 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-18 14:32:01,031 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-18 14:32:01,032 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-18 14:32:01,032 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2b375ae29a973823eea93f22f40d893acb563fa864c4860e04525925a120d938 [2024-11-18 14:32:01,317 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-18 14:32:01,342 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-18 14:32:01,345 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-18 14:32:01,346 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-18 14:32:01,347 INFO L274 PluginConnector]: CDTParser initialized [2024-11-18 14:32:01,348 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursified_nla-digbench/recursified_ps6-ll.c [2024-11-18 14:32:02,751 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-18 14:32:02,960 INFO L384 CDTParser]: Found 1 translation units. [2024-11-18 14:32:02,960 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_ps6-ll.c [2024-11-18 14:32:02,973 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/082233100/f15aa2d236bb4816bca9af67785d4ab5/FLAG5e828cb43 [2024-11-18 14:32:02,990 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/082233100/f15aa2d236bb4816bca9af67785d4ab5 [2024-11-18 14:32:02,995 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-18 14:32:02,996 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-18 14:32:02,997 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-18 14:32:03,000 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-18 14:32:03,005 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-18 14:32:03,006 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 02:32:02" (1/1) ... [2024-11-18 14:32:03,007 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@686096c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03, skipping insertion in model container [2024-11-18 14:32:03,008 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 02:32:02" (1/1) ... [2024-11-18 14:32:03,034 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-18 14:32:03,207 WARN L250 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_ps6-ll.c[987,1000] [2024-11-18 14:32:03,228 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-18 14:32:03,238 INFO L200 MainTranslator]: Completed pre-run [2024-11-18 14:32:03,248 WARN L250 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_ps6-ll.c[987,1000] [2024-11-18 14:32:03,260 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-18 14:32:03,276 INFO L204 MainTranslator]: Completed translation [2024-11-18 14:32:03,276 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03 WrapperNode [2024-11-18 14:32:03,277 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-18 14:32:03,278 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-18 14:32:03,278 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-18 14:32:03,278 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-18 14:32:03,288 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,301 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,320 INFO L138 Inliner]: procedures = 16, calls = 83, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 91 [2024-11-18 14:32:03,321 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-18 14:32:03,322 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-18 14:32:03,322 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-18 14:32:03,322 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-18 14:32:03,335 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,336 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,339 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,360 INFO L175 MemorySlicer]: Split 60 memory accesses to 5 slices as follows [2, 5, 45, 4, 4]. 75 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0]. The 7 writes are split as follows [0, 2, 2, 2, 1]. [2024-11-18 14:32:03,360 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,360 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,367 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,369 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,370 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,371 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,374 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-18 14:32:03,375 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-18 14:32:03,375 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-18 14:32:03,375 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-18 14:32:03,376 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (1/1) ... [2024-11-18 14:32:03,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-18 14:32:03,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:03,407 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) [2024-11-18 14:32:03,410 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 [2024-11-18 14:32:03,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-18 14:32:03,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-11-18 14:32:03,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-11-18 14:32:03,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-11-18 14:32:03,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-11-18 14:32:03,462 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-11-18 14:32:03,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-18 14:32:03,463 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-18 14:32:03,464 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-18 14:32:03,464 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_27_to_35_0 [2024-11-18 14:32:03,465 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_27_to_35_0 [2024-11-18 14:32:03,465 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-18 14:32:03,588 INFO L238 CfgBuilder]: Building ICFG [2024-11-18 14:32:03,591 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-18 14:32:03,888 INFO L? ?]: Removed 10 outVars from TransFormulas that were not future-live. [2024-11-18 14:32:03,888 INFO L287 CfgBuilder]: Performing block encoding [2024-11-18 14:32:03,902 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-18 14:32:03,903 INFO L316 CfgBuilder]: Removed 1 assume(true) statements. [2024-11-18 14:32:03,903 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 02:32:03 BoogieIcfgContainer [2024-11-18 14:32:03,905 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-18 14:32:03,907 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-18 14:32:03,908 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-18 14:32:03,911 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-18 14:32:03,911 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 02:32:02" (1/3) ... [2024-11-18 14:32:03,912 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60b8d0b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 02:32:03, skipping insertion in model container [2024-11-18 14:32:03,912 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 02:32:03" (2/3) ... [2024-11-18 14:32:03,913 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60b8d0b7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 02:32:03, skipping insertion in model container [2024-11-18 14:32:03,913 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 02:32:03" (3/3) ... [2024-11-18 14:32:03,916 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_ps6-ll.c [2024-11-18 14:32:03,932 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-18 14:32:03,932 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-18 14:32:03,978 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-18 14:32:03,984 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;@15ef97ac, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-18 14:32:03,984 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-18 14:32:03,988 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-18 14:32:03,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-18 14:32:03,994 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:03,995 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:03,995 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:03,999 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:03,999 INFO L85 PathProgramCache]: Analyzing trace with hash -32009173, now seen corresponding path program 1 times [2024-11-18 14:32:04,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:04,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42121680] [2024-11-18 14:32:04,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:04,008 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:04,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:04,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-18 14:32:04,211 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:04,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42121680] [2024-11-18 14:32:04,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42121680] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-18 14:32:04,212 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-18 14:32:04,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-18 14:32:04,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126729212] [2024-11-18 14:32:04,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-18 14:32:04,217 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-18 14:32:04,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:04,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-18 14:32:04,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-18 14:32:04,245 INFO L87 Difference]: Start difference. First operand has 27 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-18 14:32:04,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:04,264 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2024-11-18 14:32:04,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-18 14:32:04,266 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2024-11-18 14:32:04,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:04,273 INFO L225 Difference]: With dead ends: 51 [2024-11-18 14:32:04,273 INFO L226 Difference]: Without dead ends: 23 [2024-11-18 14:32:04,277 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-18 14:32:04,280 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:04,280 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-18 14:32:04,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-18 14:32:04,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2024-11-18 14:32:04,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-18 14:32:04,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2024-11-18 14:32:04,322 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 11 [2024-11-18 14:32:04,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:04,323 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2024-11-18 14:32:04,323 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-18 14:32:04,323 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2024-11-18 14:32:04,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-18 14:32:04,325 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:04,325 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:04,325 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-18 14:32:04,325 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:04,326 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:04,326 INFO L85 PathProgramCache]: Analyzing trace with hash 648049197, now seen corresponding path program 1 times [2024-11-18 14:32:04,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:04,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139855915] [2024-11-18 14:32:04,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:04,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:04,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:04,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1504644866] [2024-11-18 14:32:04,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:04,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:04,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:04,407 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) [2024-11-18 14:32:04,408 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-18 14:32:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:04,537 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 37 conjuncts are in the unsatisfiable core [2024-11-18 14:32:04,549 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:04,600 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:04,611 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:04,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-18 14:32:04,766 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-18 14:32:04,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:04,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139855915] [2024-11-18 14:32:04,769 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:04,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504644866] [2024-11-18 14:32:04,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504644866] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-18 14:32:04,771 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-18 14:32:04,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-11-18 14:32:04,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134152870] [2024-11-18 14:32:04,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-18 14:32:04,774 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-18 14:32:04,775 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:04,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-18 14:32:04,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-11-18 14:32:04,777 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-18 14:32:04,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:04,979 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2024-11-18 14:32:04,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-18 14:32:04,980 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2024-11-18 14:32:04,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:04,981 INFO L225 Difference]: With dead ends: 37 [2024-11-18 14:32:04,981 INFO L226 Difference]: Without dead ends: 35 [2024-11-18 14:32:04,982 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2024-11-18 14:32:04,983 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 12 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:04,984 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 111 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-18 14:32:04,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2024-11-18 14:32:04,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2024-11-18 14:32:04,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2024-11-18 14:32:04,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2024-11-18 14:32:04,995 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 11 [2024-11-18 14:32:04,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:04,995 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2024-11-18 14:32:04,995 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-18 14:32:04,996 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2024-11-18 14:32:04,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-18 14:32:04,996 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:04,996 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:05,014 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-18 14:32:05,197 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 [2024-11-18 14:32:05,197 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:05,198 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:05,198 INFO L85 PathProgramCache]: Analyzing trace with hash 1370831791, now seen corresponding path program 1 times [2024-11-18 14:32:05,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:05,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369426071] [2024-11-18 14:32:05,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:05,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:05,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:05,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [723378401] [2024-11-18 14:32:05,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:05,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:05,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:05,310 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) [2024-11-18 14:32:05,311 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-18 14:32:05,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:05,473 INFO L255 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 91 conjuncts are in the unsatisfiable core [2024-11-18 14:32:05,478 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:05,491 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:05,495 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:05,661 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:05,668 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:05,947 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-18 14:32:05,947 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:32:06,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2024-11-18 14:32:06,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:06,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369426071] [2024-11-18 14:32:06,282 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:06,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723378401] [2024-11-18 14:32:06,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723378401] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-18 14:32:06,283 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-18 14:32:06,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 15 [2024-11-18 14:32:06,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991244751] [2024-11-18 14:32:06,283 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-18 14:32:06,284 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-18 14:32:06,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:06,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-18 14:32:06,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2024-11-18 14:32:06,288 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-18 14:32:06,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:06,965 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2024-11-18 14:32:06,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-18 14:32:06,966 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2024-11-18 14:32:06,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:06,968 INFO L225 Difference]: With dead ends: 64 [2024-11-18 14:32:06,968 INFO L226 Difference]: Without dead ends: 62 [2024-11-18 14:32:06,969 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 24 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2024-11-18 14:32:06,970 INFO L432 NwaCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:06,970 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 150 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-18 14:32:06,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2024-11-18 14:32:06,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 50. [2024-11-18 14:32:06,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.121212121212121) internal successors, (37), 36 states have internal predecessors, (37), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2024-11-18 14:32:06,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 57 transitions. [2024-11-18 14:32:06,986 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 57 transitions. Word has length 21 [2024-11-18 14:32:06,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:06,986 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 57 transitions. [2024-11-18 14:32:06,987 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 7 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-18 14:32:06,987 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 57 transitions. [2024-11-18 14:32:06,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-18 14:32:06,988 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:06,988 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:07,006 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-18 14:32:07,192 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 [2024-11-18 14:32:07,194 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:07,194 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:07,195 INFO L85 PathProgramCache]: Analyzing trace with hash 668052709, now seen corresponding path program 1 times [2024-11-18 14:32:07,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:07,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453549764] [2024-11-18 14:32:07,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:07,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:07,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:07,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1145588348] [2024-11-18 14:32:07,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:07,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:07,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:07,258 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) [2024-11-18 14:32:07,261 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-18 14:32:07,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:07,369 INFO L255 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjuncts are in the unsatisfiable core [2024-11-18 14:32:07,372 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:07,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:07,382 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:07,474 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-18 14:32:07,475 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-18 14:32:07,475 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:07,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453549764] [2024-11-18 14:32:07,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:07,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145588348] [2024-11-18 14:32:07,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145588348] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-18 14:32:07,476 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-18 14:32:07,476 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2024-11-18 14:32:07,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292392136] [2024-11-18 14:32:07,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-18 14:32:07,476 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-18 14:32:07,477 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:07,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-18 14:32:07,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-18 14:32:07,478 INFO L87 Difference]: Start difference. First operand 50 states and 57 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-18 14:32:07,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:07,622 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2024-11-18 14:32:07,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-18 14:32:07,623 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2024-11-18 14:32:07,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:07,624 INFO L225 Difference]: With dead ends: 61 [2024-11-18 14:32:07,624 INFO L226 Difference]: Without dead ends: 59 [2024-11-18 14:32:07,625 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2024-11-18 14:32:07,626 INFO L432 NwaCegarLoop]: 15 mSDtfsCounter, 8 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:07,626 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 68 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-18 14:32:07,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2024-11-18 14:32:07,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2024-11-18 14:32:07,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 38 states have (on average 1.105263157894737) internal successors, (42), 41 states have internal predecessors, (42), 9 states have call successors, (9), 7 states have call predecessors, (9), 10 states have return successors, (14), 9 states have call predecessors, (14), 8 states have call successors, (14) [2024-11-18 14:32:07,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2024-11-18 14:32:07,664 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 21 [2024-11-18 14:32:07,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:07,665 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2024-11-18 14:32:07,665 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-18 14:32:07,665 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2024-11-18 14:32:07,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-18 14:32:07,667 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:07,667 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:07,686 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-18 14:32:07,868 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:07,868 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:07,869 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:07,869 INFO L85 PathProgramCache]: Analyzing trace with hash -1418783386, now seen corresponding path program 1 times [2024-11-18 14:32:07,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:07,869 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931433033] [2024-11-18 14:32:07,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:07,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:07,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:07,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [429015001] [2024-11-18 14:32:07,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:07,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:07,918 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:07,920 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) [2024-11-18 14:32:07,922 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-18 14:32:08,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:08,028 INFO L255 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-18 14:32:08,032 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:08,038 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-18 14:32:08,046 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:08,053 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-18 14:32:08,193 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 [2024-11-18 14:32:08,294 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 [2024-11-18 14:32:08,341 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-18 14:32:08,341 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:32:08,936 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:08,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931433033] [2024-11-18 14:32:08,937 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:08,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429015001] [2024-11-18 14:32:08,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429015001] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-18 14:32:08,938 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-18 14:32:08,938 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2024-11-18 14:32:08,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665966597] [2024-11-18 14:32:08,938 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-18 14:32:08,939 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-18 14:32:08,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:08,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-18 14:32:08,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2024-11-18 14:32:08,940 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand has 12 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-18 14:32:09,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:09,579 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2024-11-18 14:32:09,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-18 14:32:09,581 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 27 [2024-11-18 14:32:09,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:09,582 INFO L225 Difference]: With dead ends: 66 [2024-11-18 14:32:09,583 INFO L226 Difference]: Without dead ends: 50 [2024-11-18 14:32:09,583 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2024-11-18 14:32:09,584 INFO L432 NwaCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:09,586 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 72 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 240 Invalid, 1 Unknown, 0 Unchecked, 0.4s Time] [2024-11-18 14:32:09,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2024-11-18 14:32:09,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2024-11-18 14:32:09,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 35 states have internal predecessors, (36), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (12), 8 states have call predecessors, (12), 7 states have call successors, (12) [2024-11-18 14:32:09,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2024-11-18 14:32:09,604 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 27 [2024-11-18 14:32:09,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:09,604 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2024-11-18 14:32:09,605 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2024-11-18 14:32:09,605 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2024-11-18 14:32:09,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-18 14:32:09,605 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:09,606 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:09,626 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-18 14:32:09,806 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:09,806 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:09,807 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:09,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1267769059, now seen corresponding path program 1 times [2024-11-18 14:32:09,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:09,807 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260209935] [2024-11-18 14:32:09,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:09,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:09,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:09,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [963739613] [2024-11-18 14:32:09,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:09,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:09,864 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:09,866 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) [2024-11-18 14:32:09,871 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-18 14:32:09,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:10,005 INFO L255 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 83 conjuncts are in the unsatisfiable core [2024-11-18 14:32:10,009 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:10,015 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:10,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:10,233 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:10,237 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:10,433 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-11-18 14:32:10,434 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:32:10,997 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 106 treesize of output 38 [2024-11-18 14:32:11,007 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2024-11-18 14:32:13,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:13,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260209935] [2024-11-18 14:32:13,852 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:13,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963739613] [2024-11-18 14:32:13,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963739613] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-18 14:32:13,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-18 14:32:13,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2024-11-18 14:32:13,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597438476] [2024-11-18 14:32:13,853 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-18 14:32:13,853 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-18 14:32:13,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:13,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-18 14:32:13,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2024-11-18 14:32:13,854 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand has 11 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-18 14:32:14,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:14,214 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2024-11-18 14:32:14,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-18 14:32:14,215 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 33 [2024-11-18 14:32:14,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:14,216 INFO L225 Difference]: With dead ends: 59 [2024-11-18 14:32:14,216 INFO L226 Difference]: Without dead ends: 57 [2024-11-18 14:32:14,217 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2024-11-18 14:32:14,218 INFO L432 NwaCegarLoop]: 15 mSDtfsCounter, 11 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:14,218 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 90 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-18 14:32:14,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2024-11-18 14:32:14,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2024-11-18 14:32:14,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 39 states have internal predecessors, (40), 9 states have call successors, (9), 7 states have call predecessors, (9), 9 states have return successors, (13), 9 states have call predecessors, (13), 8 states have call successors, (13) [2024-11-18 14:32:14,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2024-11-18 14:32:14,235 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 33 [2024-11-18 14:32:14,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:14,236 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2024-11-18 14:32:14,236 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.625) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-18 14:32:14,236 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2024-11-18 14:32:14,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-11-18 14:32:14,237 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:14,237 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:14,250 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-18 14:32:14,437 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:14,438 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:14,439 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:14,439 INFO L85 PathProgramCache]: Analyzing trace with hash 38977438, now seen corresponding path program 1 times [2024-11-18 14:32:14,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:14,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240502945] [2024-11-18 14:32:14,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:14,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:14,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-18 14:32:14,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [930911011] [2024-11-18 14:32:14,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-18 14:32:14,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:14,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:14,486 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-18 14:32:14,489 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-18 14:32:14,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-18 14:32:14,655 INFO L255 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-11-18 14:32:14,660 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:14,664 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-18 14:32:14,668 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:14,671 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:14,675 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:14,992 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 13 treesize of output 9 [2024-11-18 14:32:15,253 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-11-18 14:32:15,428 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:32:16,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 37 [2024-11-18 14:32:16,623 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 33 [2024-11-18 14:32:25,107 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:25,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240502945] [2024-11-18 14:32:25,108 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:25,108 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930911011] [2024-11-18 14:32:25,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930911011] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-18 14:32:25,108 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-18 14:32:25,108 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2024-11-18 14:32:25,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513920320] [2024-11-18 14:32:25,108 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-18 14:32:25,108 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-18 14:32:25,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:25,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-18 14:32:25,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=479, Unknown=2, NotChecked=0, Total=552 [2024-11-18 14:32:25,110 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 16 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 14 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-18 14:32:26,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:26,010 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2024-11-18 14:32:26,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-18 14:32:26,010 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 14 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 39 [2024-11-18 14:32:26,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:26,011 INFO L225 Difference]: With dead ends: 64 [2024-11-18 14:32:26,011 INFO L226 Difference]: Without dead ends: 46 [2024-11-18 14:32:26,012 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=118, Invalid=810, Unknown=2, NotChecked=0, Total=930 [2024-11-18 14:32:26,013 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:26,013 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 84 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 359 Invalid, 1 Unknown, 0 Unchecked, 0.6s Time] [2024-11-18 14:32:26,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2024-11-18 14:32:26,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2024-11-18 14:32:26,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 31 states have (on average 1.064516129032258) internal successors, (33), 32 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2024-11-18 14:32:26,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2024-11-18 14:32:26,022 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 39 [2024-11-18 14:32:26,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:26,023 INFO L471 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2024-11-18 14:32:26,023 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 14 states have internal predecessors, (25), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-18 14:32:26,023 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2024-11-18 14:32:26,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2024-11-18 14:32:26,024 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:26,024 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:26,038 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-18 14:32:26,224 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:26,225 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:26,225 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:26,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1597426603, now seen corresponding path program 2 times [2024-11-18 14:32:26,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:26,225 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568583269] [2024-11-18 14:32:26,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-11-18 14:32:26,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:26,286 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-11-18 14:32:26,286 INFO L228 tOrderPrioritization]: Conjunction of SSA is unknown [2024-11-18 14:32:26,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [822071640] [2024-11-18 14:32:26,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2024-11-18 14:32:26,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:26,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:26,293 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-18 14:32:26,294 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-18 14:32:26,534 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2024-11-18 14:32:26,534 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-18 14:32:26,538 INFO L255 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 195 conjuncts are in the unsatisfiable core [2024-11-18 14:32:26,543 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:26,547 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-18 14:32:26,550 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:26,554 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:26,559 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:27,068 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 13 treesize of output 9 [2024-11-18 14:32:27,424 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 38 [2024-11-18 14:32:27,430 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:27,609 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-18 14:32:27,609 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:32:40,746 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 120 treesize of output 116 [2024-11-18 14:32:40,756 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 116 treesize of output 48 [2024-11-18 14:32:40,768 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 48 treesize of output 44 [2024-11-18 14:32:47,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-18 14:32:47,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568583269] [2024-11-18 14:32:47,554 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-18 14:32:47,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822071640] [2024-11-18 14:32:47,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822071640] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-18 14:32:47,554 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-18 14:32:47,554 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2024-11-18 14:32:47,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807129915] [2024-11-18 14:32:47,554 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-18 14:32:47,555 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-18 14:32:47,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-18 14:32:47,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-18 14:32:47,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=527, Unknown=2, NotChecked=0, Total=600 [2024-11-18 14:32:47,556 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 18 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 15 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-18 14:32:48,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-18 14:32:48,569 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2024-11-18 14:32:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-18 14:32:48,569 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 15 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 45 [2024-11-18 14:32:48,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-18 14:32:48,570 INFO L225 Difference]: With dead ends: 57 [2024-11-18 14:32:48,570 INFO L226 Difference]: Without dead ends: 55 [2024-11-18 14:32:48,571 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=112, Invalid=816, Unknown=2, NotChecked=0, Total=930 [2024-11-18 14:32:48,571 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 12 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-18 14:32:48,571 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 93 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-18 14:32:48,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2024-11-18 14:32:48,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2024-11-18 14:32:48,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 37 states have internal predecessors, (38), 9 states have call successors, (9), 7 states have call predecessors, (9), 8 states have return successors, (14), 9 states have call predecessors, (14), 8 states have call successors, (14) [2024-11-18 14:32:48,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2024-11-18 14:32:48,581 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 45 [2024-11-18 14:32:48,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-18 14:32:48,581 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2024-11-18 14:32:48,581 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 15 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2024-11-18 14:32:48,582 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2024-11-18 14:32:48,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2024-11-18 14:32:48,582 INFO L207 NwaCegarLoop]: Found error trace [2024-11-18 14:32:48,583 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-18 14:32:48,592 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-18 14:32:48,784 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:48,784 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-18 14:32:48,785 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-18 14:32:48,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1824004467, now seen corresponding path program 3 times [2024-11-18 14:32:48,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-18 14:32:48,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798587412] [2024-11-18 14:32:48,785 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-18 14:32:48,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-18 14:32:48,879 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-18 14:32:48,881 INFO L228 tOrderPrioritization]: Conjunction of SSA is unknown [2024-11-18 14:32:48,883 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1615106898] [2024-11-18 14:32:48,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-18 14:32:48,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-18 14:32:48,884 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-18 14:32:48,887 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-18 14:32:48,888 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-18 14:32:49,605 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-18 14:32:49,605 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-18 14:32:49,613 WARN L253 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 269 conjuncts are in the unsatisfiable core [2024-11-18 14:32:49,619 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-18 14:32:49,637 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:49,642 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:49,647 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-18 14:32:52,614 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 38 [2024-11-18 14:32:52,626 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-18 14:32:52,857 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 18 proven. 41 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-18 14:32:52,857 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-18 14:33:11,158 WARN L286 SmtUtils]: Spent 17.54s on a formula simplification. DAG size of input: 207 DAG size of output: 193 (called from [L 276] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition) [2024-11-18 14:33:17,867 WARN L286 SmtUtils]: Spent 6.14s on a formula simplification that was a NOOP. DAG size: 157 (called from [L 276] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.sequentialComposition)