./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx --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 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 22:09:54,783 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 22:09:54,905 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-21 22:09:54,916 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 22:09:54,917 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 22:09:54,946 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 22:09:54,948 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 22:09:54,949 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 22:09:54,950 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-21 22:09:54,955 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-21 22:09:54,956 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 22:09:54,956 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 22:09:54,957 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 22:09:54,959 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 22:09:54,959 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 22:09:54,960 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 22:09:54,960 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 22:09:54,961 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 22:09:54,961 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 22:09:54,962 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 22:09:54,962 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 22:09:54,963 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 22:09:54,964 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 22:09:54,964 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 22:09:54,964 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 22:09:54,965 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 22:09:54,965 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 22:09:54,966 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 22:09:54,967 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 22:09:54,967 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 22:09:54,968 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 22:09:54,969 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:09:54,969 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 22:09:54,969 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 22:09:54,969 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 22:09:54,970 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 22:09:54,970 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 22:09:54,970 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 22:09:54,970 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 22:09:54,971 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 22:09:54,971 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 22:09:54,971 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 22:09:54,971 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:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2023-11-21 22:09:55,295 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 22:09:55,334 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 22:09:55,337 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 22:09:55,339 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 22:09:55,341 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 22:09:55,342 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-21 22:09:58,630 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 22:09:59,016 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 22:09:59,017 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-21 22:09:59,031 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/data/3c97fc4fc/f6e8400ced56436ab8f9e017987e403f/FLAG75af1f643 [2023-11-21 22:09:59,045 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/data/3c97fc4fc/f6e8400ced56436ab8f9e017987e403f [2023-11-21 22:09:59,048 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 22:09:59,049 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 22:09:59,051 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 22:09:59,051 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 22:09:59,056 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 22:09:59,057 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,058 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35f11c83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59, skipping insertion in model container [2023-11-21 22:09:59,058 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,097 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 22:09:59,376 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2023-11-21 22:09:59,406 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:09:59,415 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 22:09:59,452 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i[22636,22649] [2023-11-21 22:09:59,467 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:09:59,508 INFO L206 MainTranslator]: Completed translation [2023-11-21 22:09:59,509 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59 WrapperNode [2023-11-21 22:09:59,509 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 22:09:59,510 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 22:09:59,511 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 22:09:59,511 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 22:09:59,519 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,555 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,596 INFO L138 Inliner]: procedures = 129, calls = 79, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 206 [2023-11-21 22:09:59,596 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 22:09:59,597 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 22:09:59,597 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 22:09:59,598 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 22:09:59,609 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,609 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,629 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,672 INFO L187 HeapSplitter]: Split 42 memory accesses to 5 slices as follows [2, 8, 18, 6, 8] [2023-11-21 22:09:59,672 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,672 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,685 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,691 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,694 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,697 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,702 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 22:09:59,703 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 22:09:59,703 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 22:09:59,703 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 22:09:59,704 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (1/1) ... [2023-11-21 22:09:59,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:09:59,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:09:59,739 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 22:09:59,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 22:09:59,783 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2023-11-21 22:09:59,783 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2023-11-21 22:09:59,784 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 22:09:59,784 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 22:09:59,785 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 22:09:59,785 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#0 [2023-11-21 22:09:59,785 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#1 [2023-11-21 22:09:59,785 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#2 [2023-11-21 22:09:59,787 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#3 [2023-11-21 22:09:59,788 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#4 [2023-11-21 22:09:59,788 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#0 [2023-11-21 22:09:59,788 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#1 [2023-11-21 22:09:59,788 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#2 [2023-11-21 22:09:59,789 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#3 [2023-11-21 22:09:59,789 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#4 [2023-11-21 22:09:59,789 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2023-11-21 22:09:59,789 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2023-11-21 22:09:59,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 22:09:59,790 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#0 [2023-11-21 22:09:59,790 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#1 [2023-11-21 22:09:59,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#2 [2023-11-21 22:09:59,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#3 [2023-11-21 22:09:59,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$#4 [2023-11-21 22:09:59,791 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2023-11-21 22:09:59,792 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2023-11-21 22:09:59,792 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-21 22:09:59,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-21 22:09:59,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-21 22:09:59,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2023-11-21 22:09:59,794 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2023-11-21 22:09:59,794 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2023-11-21 22:09:59,794 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2023-11-21 22:09:59,795 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 22:09:59,795 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 22:10:00,014 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 22:10:00,017 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 22:10:00,459 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 22:10:00,596 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 22:10:00,596 INFO L308 CfgBuilder]: Removed 33 assume(true) statements. [2023-11-21 22:10:00,598 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:10:00 BoogieIcfgContainer [2023-11-21 22:10:00,598 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 22:10:00,601 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 22:10:00,601 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 22:10:00,605 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 22:10:00,605 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 10:09:59" (1/3) ... [2023-11-21 22:10:00,606 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ce69ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:10:00, skipping insertion in model container [2023-11-21 22:10:00,607 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:09:59" (2/3) ... [2023-11-21 22:10:00,608 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ce69ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:10:00, skipping insertion in model container [2023-11-21 22:10:00,608 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:10:00" (3/3) ... [2023-11-21 22:10:00,610 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2023-11-21 22:10:00,631 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 22:10:00,631 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 22:10:00,703 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 22:10:00,711 INFO L357 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, mHoare=true, 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;@6321374c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 22:10:00,712 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 22:10:00,716 INFO L276 IsEmpty]: Start isEmpty. Operand has 78 states, 58 states have (on average 1.6724137931034482) internal successors, (97), 64 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-21 22:10:00,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-21 22:10:00,725 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:00,726 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:00,731 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:00,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:00,739 INFO L85 PathProgramCache]: Analyzing trace with hash 300852222, now seen corresponding path program 1 times [2023-11-21 22:10:00,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:00,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760225597] [2023-11-21 22:10:00,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:00,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:00,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:01,015 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:10:01,016 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:01,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760225597] [2023-11-21 22:10:01,017 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760225597] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:10:01,017 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:10:01,017 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 22:10:01,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999516976] [2023-11-21 22:10:01,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:10:01,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-21 22:10:01,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:01,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-21 22:10:01,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 22:10:01,074 INFO L87 Difference]: Start difference. First operand has 78 states, 58 states have (on average 1.6724137931034482) internal successors, (97), 64 states have internal predecessors, (97), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 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) [2023-11-21 22:10:01,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:01,180 INFO L93 Difference]: Finished difference Result 151 states and 261 transitions. [2023-11-21 22:10:01,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-21 22:10:01,183 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 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 13 [2023-11-21 22:10:01,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:01,194 INFO L225 Difference]: With dead ends: 151 [2023-11-21 22:10:01,195 INFO L226 Difference]: Without dead ends: 74 [2023-11-21 22:10:01,201 INFO L412 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 [2023-11-21 22:10:01,206 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:01,207 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 22:10:01,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-21 22:10:01,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-21 22:10:01,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 53 states have (on average 1.3018867924528301) internal successors, (69), 61 states have internal predecessors, (69), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 22:10:01,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 94 transitions. [2023-11-21 22:10:01,277 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 94 transitions. Word has length 13 [2023-11-21 22:10:01,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:01,277 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 94 transitions. [2023-11-21 22:10:01,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 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) [2023-11-21 22:10:01,278 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 94 transitions. [2023-11-21 22:10:01,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-21 22:10:01,280 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:01,280 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:01,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 22:10:01,281 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:01,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:01,282 INFO L85 PathProgramCache]: Analyzing trace with hash -145429979, now seen corresponding path program 1 times [2023-11-21 22:10:01,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:01,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682336432] [2023-11-21 22:10:01,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:01,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:01,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:02,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:02,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:02,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:02,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:02,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:02,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:03,063 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 22:10:03,064 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:03,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682336432] [2023-11-21 22:10:03,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682336432] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:03,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600849004] [2023-11-21 22:10:03,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:03,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:03,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:03,070 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:03,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 22:10:03,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:03,366 INFO L262 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-21 22:10:03,375 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:03,511 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 22:10:03,566 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 24 treesize of output 16 [2023-11-21 22:10:03,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 22:10:03,601 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 16 treesize of output 8 [2023-11-21 22:10:03,610 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 22:10:03,610 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:03,722 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2023-11-21 22:10:03,866 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 22:10:03,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600849004] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 22:10:03,867 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 22:10:03,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2023-11-21 22:10:03,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801318478] [2023-11-21 22:10:03,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:03,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 22:10:03,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:03,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 22:10:03,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2023-11-21 22:10:03,874 INFO L87 Difference]: Start difference. First operand 74 states and 94 transitions. Second operand has 12 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-21 22:10:04,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:04,819 INFO L93 Difference]: Finished difference Result 92 states and 115 transitions. [2023-11-21 22:10:04,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 22:10:04,820 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 25 [2023-11-21 22:10:04,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:04,823 INFO L225 Difference]: With dead ends: 92 [2023-11-21 22:10:04,824 INFO L226 Difference]: Without dead ends: 89 [2023-11-21 22:10:04,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-11-21 22:10:04,826 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 108 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:04,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 267 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 22:10:04,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-21 22:10:04,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2023-11-21 22:10:04,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.3015873015873016) internal successors, (82), 71 states have internal predecessors, (82), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 22:10:04,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2023-11-21 22:10:04,847 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 25 [2023-11-21 22:10:04,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:04,848 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2023-11-21 22:10:04,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.1) internal successors, (21), 10 states have internal predecessors, (21), 4 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-21 22:10:04,849 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2023-11-21 22:10:04,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-21 22:10:04,850 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:04,850 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:04,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:05,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:05,057 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:05,057 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:05,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1968834447, now seen corresponding path program 1 times [2023-11-21 22:10:05,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:05,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939525935] [2023-11-21 22:10:05,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:05,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:05,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:05,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:05,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:05,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:05,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:05,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:06,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:06,044 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 22:10:06,044 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:06,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939525935] [2023-11-21 22:10:06,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939525935] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:06,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771500542] [2023-11-21 22:10:06,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:06,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:06,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:06,049 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:06,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 22:10:06,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:06,282 INFO L262 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-21 22:10:06,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:06,305 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 22:10:06,349 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 24 treesize of output 16 [2023-11-21 22:10:06,354 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 22:10:06,402 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 16 treesize of output 8 [2023-11-21 22:10:06,413 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 22:10:06,413 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:06,567 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2023-11-21 22:10:06,687 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 22:10:06,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771500542] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 22:10:06,688 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 22:10:06,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 12 [2023-11-21 22:10:06,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169585153] [2023-11-21 22:10:06,688 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:06,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 22:10:06,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:06,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 22:10:06,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2023-11-21 22:10:06,691 INFO L87 Difference]: Start difference. First operand 85 states and 107 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-21 22:10:07,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:07,582 INFO L93 Difference]: Finished difference Result 91 states and 113 transitions. [2023-11-21 22:10:07,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 22:10:07,583 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2023-11-21 22:10:07,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:07,585 INFO L225 Difference]: With dead ends: 91 [2023-11-21 22:10:07,585 INFO L226 Difference]: Without dead ends: 88 [2023-11-21 22:10:07,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2023-11-21 22:10:07,587 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 114 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:07,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 263 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 22:10:07,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-21 22:10:07,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 85. [2023-11-21 22:10:07,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 63 states have (on average 1.2857142857142858) internal successors, (81), 71 states have internal predecessors, (81), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 22:10:07,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 106 transitions. [2023-11-21 22:10:07,624 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 106 transitions. Word has length 27 [2023-11-21 22:10:07,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:07,625 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 106 transitions. [2023-11-21 22:10:07,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-21 22:10:07,625 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 106 transitions. [2023-11-21 22:10:07,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-21 22:10:07,627 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:07,628 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:07,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:07,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:07,850 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:07,850 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:07,850 INFO L85 PathProgramCache]: Analyzing trace with hash 822157051, now seen corresponding path program 1 times [2023-11-21 22:10:07,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:07,851 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347182989] [2023-11-21 22:10:07,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:07,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:07,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:10,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:10,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:10,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:10,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:10,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:10,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:11,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 22:10:11,236 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:11,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347182989] [2023-11-21 22:10:11,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347182989] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:11,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245115004] [2023-11-21 22:10:11,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:11,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:11,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:11,240 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:11,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 22:10:11,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:11,579 INFO L262 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 138 conjunts are in the unsatisfiable core [2023-11-21 22:10:11,590 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:11,628 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 8 treesize of output 1 [2023-11-21 22:10:11,632 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 [2023-11-21 22:10:11,717 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:10:11,728 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 22:10:11,908 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 20 [2023-11-21 22:10:11,923 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 16 treesize of output 1 [2023-11-21 22:10:11,941 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 9 [2023-11-21 22:10:12,074 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 [2023-11-21 22:10:12,088 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 42 treesize of output 19 [2023-11-21 22:10:12,234 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 [2023-11-21 22:10:12,245 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 40 treesize of output 28 [2023-11-21 22:10:12,260 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 [2023-11-21 22:10:12,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 22:10:12,541 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 19 [2023-11-21 22:10:12,564 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 22:10:12,565 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-21 22:10:12,691 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2023-11-21 22:10:12,698 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 [2023-11-21 22:10:12,947 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 [2023-11-21 22:10:13,035 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:10:13,036 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:13,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245115004] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:13,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:10:13,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 30 [2023-11-21 22:10:13,830 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060348827] [2023-11-21 22:10:13,830 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:13,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-21 22:10:13,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:13,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-21 22:10:13,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2023-11-21 22:10:13,835 INFO L87 Difference]: Start difference. First operand 85 states and 106 transitions. Second operand has 30 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 24 states have internal predecessors, (42), 8 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 22:10:17,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:17,049 INFO L93 Difference]: Finished difference Result 144 states and 183 transitions. [2023-11-21 22:10:17,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-21 22:10:17,050 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 24 states have internal predecessors, (42), 8 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 31 [2023-11-21 22:10:17,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:17,053 INFO L225 Difference]: With dead ends: 144 [2023-11-21 22:10:17,053 INFO L226 Difference]: Without dead ends: 141 [2023-11-21 22:10:17,055 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=249, Invalid=2201, Unknown=0, NotChecked=0, Total=2450 [2023-11-21 22:10:17,056 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 158 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 1340 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 1386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:17,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 511 Invalid, 1386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1340 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-11-21 22:10:17,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2023-11-21 22:10:17,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 108. [2023-11-21 22:10:17,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 82 states have (on average 1.2804878048780488) internal successors, (105), 91 states have internal predecessors, (105), 20 states have call successors, (20), 6 states have call predecessors, (20), 5 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-21 22:10:17,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 136 transitions. [2023-11-21 22:10:17,092 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 136 transitions. Word has length 31 [2023-11-21 22:10:17,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:17,093 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 136 transitions. [2023-11-21 22:10:17,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 24 states have internal predecessors, (42), 8 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 22:10:17,094 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 136 transitions. [2023-11-21 22:10:17,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-21 22:10:17,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:17,096 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:17,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:17,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:17,312 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:17,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:17,313 INFO L85 PathProgramCache]: Analyzing trace with hash -1579103236, now seen corresponding path program 1 times [2023-11-21 22:10:17,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:17,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041271473] [2023-11-21 22:10:17,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:17,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:17,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:19,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:19,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:19,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:19,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:19,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:19,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:20,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-21 22:10:20,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:20,315 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 22:10:20,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:20,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041271473] [2023-11-21 22:10:20,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041271473] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:20,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312893281] [2023-11-21 22:10:20,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:20,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:20,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:20,318 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:20,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 22:10:20,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:20,575 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 82 conjunts are in the unsatisfiable core [2023-11-21 22:10:20,587 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:20,636 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 11 [2023-11-21 22:10:20,641 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 9 [2023-11-21 22:10:20,649 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 27 [2023-11-21 22:10:20,654 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 27 treesize of output 19 [2023-11-21 22:10:20,663 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 [2023-11-21 22:10:20,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 31 [2023-11-21 22:10:20,757 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 [2023-11-21 22:10:20,766 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 [2023-11-21 22:10:20,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 22:10:20,903 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2023-11-21 22:10:20,915 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 22:10:20,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-21 22:10:20,925 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2023-11-21 22:10:21,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 22:10:21,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:21,593 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312893281] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:21,593 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:10:21,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 17 [2023-11-21 22:10:21,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472496259] [2023-11-21 22:10:21,594 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:21,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-21 22:10:21,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:21,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-21 22:10:21,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2023-11-21 22:10:21,598 INFO L87 Difference]: Start difference. First operand 108 states and 136 transitions. Second operand has 17 states, 10 states have (on average 3.9) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-21 22:10:23,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:23,916 INFO L93 Difference]: Finished difference Result 195 states and 247 transitions. [2023-11-21 22:10:23,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-21 22:10:23,917 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 10 states have (on average 3.9) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) Word has length 34 [2023-11-21 22:10:23,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:23,920 INFO L225 Difference]: With dead ends: 195 [2023-11-21 22:10:23,920 INFO L226 Difference]: Without dead ends: 192 [2023-11-21 22:10:23,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2023-11-21 22:10:23,923 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 251 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 760 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:23,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 278 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 760 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-11-21 22:10:23,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2023-11-21 22:10:23,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 119. [2023-11-21 22:10:23,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 90 states have (on average 1.2666666666666666) internal successors, (114), 99 states have internal predecessors, (114), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-21 22:10:23,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 149 transitions. [2023-11-21 22:10:23,988 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 149 transitions. Word has length 34 [2023-11-21 22:10:23,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:23,990 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 149 transitions. [2023-11-21 22:10:23,991 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 10 states have (on average 3.9) internal successors, (39), 15 states have internal predecessors, (39), 6 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-21 22:10:23,991 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 149 transitions. [2023-11-21 22:10:23,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-21 22:10:23,996 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:23,997 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:24,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:24,220 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:24,221 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:24,221 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:24,221 INFO L85 PathProgramCache]: Analyzing trace with hash 899240553, now seen corresponding path program 1 times [2023-11-21 22:10:24,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:24,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678913223] [2023-11-21 22:10:24,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:24,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:24,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:26,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:26,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:26,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:26,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:26,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:26,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:27,149 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 22:10:27,149 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:27,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678913223] [2023-11-21 22:10:27,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678913223] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:27,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058777147] [2023-11-21 22:10:27,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:27,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:27,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:27,152 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:27,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 22:10:27,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:27,456 INFO L262 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 136 conjunts are in the unsatisfiable core [2023-11-21 22:10:27,474 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:27,497 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 8 treesize of output 1 [2023-11-21 22:10:27,500 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 [2023-11-21 22:10:27,629 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:10:27,637 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 [2023-11-21 22:10:27,771 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 15 [2023-11-21 22:10:27,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 20 [2023-11-21 22:10:27,795 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 16 treesize of output 1 [2023-11-21 22:10:27,817 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 9 [2023-11-21 22:10:27,920 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 [2023-11-21 22:10:27,930 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 42 treesize of output 19 [2023-11-21 22:10:28,092 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 51 treesize of output 35 [2023-11-21 22:10:28,105 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 [2023-11-21 22:10:28,114 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 [2023-11-21 22:10:28,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 22:10:28,378 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 19 [2023-11-21 22:10:28,396 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 22:10:28,396 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-21 22:10:28,415 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2023-11-21 22:10:28,520 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 22 [2023-11-21 22:10:28,526 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 [2023-11-21 22:10:28,724 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 [2023-11-21 22:10:28,765 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 22:10:28,766 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:29,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058777147] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:29,128 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:10:29,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 28 [2023-11-21 22:10:29,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638132096] [2023-11-21 22:10:29,129 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:29,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-21 22:10:29,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:29,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-21 22:10:29,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=736, Unknown=0, NotChecked=0, Total=812 [2023-11-21 22:10:29,131 INFO L87 Difference]: Start difference. First operand 119 states and 149 transitions. Second operand has 28 states, 17 states have (on average 2.764705882352941) internal successors, (47), 23 states have internal predecessors, (47), 8 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 22:10:31,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:31,727 INFO L93 Difference]: Finished difference Result 204 states and 257 transitions. [2023-11-21 22:10:31,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-21 22:10:31,728 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 17 states have (on average 2.764705882352941) internal successors, (47), 23 states have internal predecessors, (47), 8 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 35 [2023-11-21 22:10:31,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:31,733 INFO L225 Difference]: With dead ends: 204 [2023-11-21 22:10:31,733 INFO L226 Difference]: Without dead ends: 142 [2023-11-21 22:10:31,736 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=165, Invalid=1395, Unknown=0, NotChecked=0, Total=1560 [2023-11-21 22:10:31,737 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 130 mSDsluCounter, 480 mSDsCounter, 0 mSdLazyCounter, 1378 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 1435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:31,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 520 Invalid, 1435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1378 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-21 22:10:31,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-11-21 22:10:31,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 114. [2023-11-21 22:10:31,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 94 states have internal predecessors, (106), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-21 22:10:31,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 141 transitions. [2023-11-21 22:10:31,782 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 141 transitions. Word has length 35 [2023-11-21 22:10:31,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:31,782 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 141 transitions. [2023-11-21 22:10:31,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 17 states have (on average 2.764705882352941) internal successors, (47), 23 states have internal predecessors, (47), 8 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 22:10:31,783 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 141 transitions. [2023-11-21 22:10:31,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-21 22:10:31,785 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:31,785 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:31,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:32,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-21 22:10:32,012 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:32,012 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:32,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1213845648, now seen corresponding path program 1 times [2023-11-21 22:10:32,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:32,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844286970] [2023-11-21 22:10:32,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:32,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:32,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:34,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 22:10:34,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:34,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2023-11-21 22:10:34,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:34,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-21 22:10:34,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:35,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2023-11-21 22:10:35,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:35,554 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 22:10:35,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:10:35,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844286970] [2023-11-21 22:10:35,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844286970] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:35,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968340204] [2023-11-21 22:10:35,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:35,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:10:35,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:10:35,556 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:10:35,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 22:10:35,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:10:35,871 INFO L262 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 117 conjunts are in the unsatisfiable core [2023-11-21 22:10:35,878 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:10:35,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 22:10:36,045 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 20 [2023-11-21 22:10:36,063 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 22:10:36,068 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 [2023-11-21 22:10:36,076 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 9 [2023-11-21 22:10:36,128 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 39 treesize of output 16 [2023-11-21 22:10:36,227 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 [2023-11-21 22:10:36,238 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 22:10:36,415 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 33 treesize of output 21 [2023-11-21 22:10:36,418 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-21 22:10:36,436 INFO L349 Elim1Store]: treesize reduction 32, result has 36.0 percent of original size [2023-11-21 22:10:36,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 24 [2023-11-21 22:10:36,442 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2023-11-21 22:10:36,601 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 22:10:36,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-21 22:10:36,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 16 [2023-11-21 22:10:36,679 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 20 treesize of output 12 [2023-11-21 22:10:36,818 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 16 treesize of output 8 [2023-11-21 22:10:36,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 22:10:36,826 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:10:37,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968340204] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 22:10:37,110 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:10:37,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2023-11-21 22:10:37,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360634942] [2023-11-21 22:10:37,111 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:10:37,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-11-21 22:10:37,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:10:37,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-11-21 22:10:37,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1295, Unknown=1, NotChecked=0, Total=1406 [2023-11-21 22:10:37,119 INFO L87 Difference]: Start difference. First operand 114 states and 141 transitions. Second operand has 34 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 28 states have internal predecessors, (49), 11 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 22:10:40,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:10:40,160 INFO L93 Difference]: Finished difference Result 152 states and 195 transitions. [2023-11-21 22:10:40,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-21 22:10:40,161 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 28 states have internal predecessors, (49), 11 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 36 [2023-11-21 22:10:40,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:10:40,163 INFO L225 Difference]: With dead ends: 152 [2023-11-21 22:10:40,163 INFO L226 Difference]: Without dead ends: 149 [2023-11-21 22:10:40,166 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=315, Invalid=2764, Unknown=1, NotChecked=0, Total=3080 [2023-11-21 22:10:40,167 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 157 mSDsluCounter, 654 mSDsCounter, 0 mSdLazyCounter, 1863 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 1935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 1863 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-21 22:10:40,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 696 Invalid, 1935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 1863 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-21 22:10:40,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2023-11-21 22:10:40,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 116. [2023-11-21 22:10:40,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 87 states have (on average 1.2528735632183907) internal successors, (109), 96 states have internal predecessors, (109), 22 states have call successors, (22), 7 states have call predecessors, (22), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-21 22:10:40,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 144 transitions. [2023-11-21 22:10:40,203 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 144 transitions. Word has length 36 [2023-11-21 22:10:40,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:10:40,204 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 144 transitions. [2023-11-21 22:10:40,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 28 states have internal predecessors, (49), 11 states have call successors, (11), 7 states have call predecessors, (11), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 22:10:40,204 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 144 transitions. [2023-11-21 22:10:40,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 22:10:40,205 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:10:40,205 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:10:40,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 22:10:40,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1faf564-58a9-4a71-9de9-af6031e72f46/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-21 22:10:40,421 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting failErr0ASSERT_VIOLATIONERROR_FUNCTION === [failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:10:40,421 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:10:40,421 INFO L85 PathProgramCache]: Analyzing trace with hash -334576563, now seen corresponding path program 1 times [2023-11-21 22:10:40,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:10:40,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017125062] [2023-11-21 22:10:40,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:10:40,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:10:40,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat