./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/dancing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc 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_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/dancing.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 21:58:18,177 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 21:58:18,252 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-24 21:58:18,258 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 21:58:18,258 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 21:58:18,286 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 21:58:18,287 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 21:58:18,288 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 21:58:18,289 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-24 21:58:18,290 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-24 21:58:18,290 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 21:58:18,291 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 21:58:18,292 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-24 21:58:18,292 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-24 21:58:18,293 INFO L153 SettingsManager]: * Use SBE=true [2023-11-24 21:58:18,294 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 21:58:18,294 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 21:58:18,295 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 21:58:18,295 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 21:58:18,296 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 21:58:18,297 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-24 21:58:18,299 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-24 21:58:18,300 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-24 21:58:18,301 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 21:58:18,301 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-24 21:58:18,302 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-24 21:58:18,302 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 21:58:18,302 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 21:58:18,303 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 21:58:18,304 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-24 21:58:18,305 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 21:58:18,306 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 21:58:18,306 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-24 21:58:18,306 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 21:58:18,307 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 21:58:18,307 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-24 21:58:18,307 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 21:58:18,307 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 21:58:18,308 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-24 21:58:18,308 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-24 21:58:18,308 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 21:58:18,309 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_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2023-11-24 21:58:18,606 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 21:58:18,646 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 21:58:18,649 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 21:58:18,650 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 21:58:18,651 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 21:58:18,653 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/../../sv-benchmarks/c/heap-manipulation/dancing.i [2023-11-24 21:58:21,762 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 21:58:22,082 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 21:58:22,092 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/sv-benchmarks/c/heap-manipulation/dancing.i [2023-11-24 21:58:22,109 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/data/f03c67827/0853316f626f4fd0a43048bc5430336d/FLAGc5c68450f [2023-11-24 21:58:22,128 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/data/f03c67827/0853316f626f4fd0a43048bc5430336d [2023-11-24 21:58:22,134 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 21:58:22,137 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 21:58:22,139 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 21:58:22,139 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 21:58:22,145 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 21:58:22,148 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,149 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78a6fd4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22, skipping insertion in model container [2023-11-24 21:58:22,149 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,214 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 21:58:22,498 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 21:58:22,512 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 21:58:22,598 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 21:58:22,645 INFO L206 MainTranslator]: Completed translation [2023-11-24 21:58:22,646 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22 WrapperNode [2023-11-24 21:58:22,646 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 21:58:22,647 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 21:58:22,647 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 21:58:22,648 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 21:58:22,656 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,690 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,724 INFO L138 Inliner]: procedures = 124, calls = 41, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 101 [2023-11-24 21:58:22,724 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 21:58:22,725 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 21:58:22,725 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 21:58:22,726 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 21:58:22,738 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,738 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,753 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,773 INFO L175 MemorySlicer]: Split 23 memory accesses to 2 slices as follows [2, 21]. 91 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0]. The 9 writes are split as follows [0, 9]. [2023-11-24 21:58:22,774 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,774 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,785 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,789 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,790 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,792 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,796 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 21:58:22,797 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 21:58:22,797 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 21:58:22,797 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 21:58:22,798 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (1/1) ... [2023-11-24 21:58:22,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-24 21:58:22,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:22,860 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-24 21:58:22,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-24 21:58:22,907 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2023-11-24 21:58:22,908 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2023-11-24 21:58:22,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-24 21:58:22,909 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-24 21:58:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-24 21:58:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 21:58:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 21:58:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#0 [2023-11-24 21:58:22,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$#1 [2023-11-24 21:58:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#0 [2023-11-24 21:58:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$#1 [2023-11-24 21:58:22,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 21:58:22,926 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-24 21:58:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-24 21:58:22,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 21:58:22,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 21:58:23,116 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 21:58:23,120 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 21:58:23,552 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 21:58:23,616 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 21:58:23,620 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-24 21:58:23,621 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 09:58:23 BoogieIcfgContainer [2023-11-24 21:58:23,621 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 21:58:23,624 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 21:58:23,624 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 21:58:23,631 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 21:58:23,631 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 09:58:22" (1/3) ... [2023-11-24 21:58:23,632 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d58ecee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 09:58:23, skipping insertion in model container [2023-11-24 21:58:23,632 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 09:58:22" (2/3) ... [2023-11-24 21:58:23,633 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d58ecee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 09:58:23, skipping insertion in model container [2023-11-24 21:58:23,633 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 09:58:23" (3/3) ... [2023-11-24 21:58:23,634 INFO L112 eAbstractionObserver]: Analyzing ICFG dancing.i [2023-11-24 21:58:23,655 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 21:58:23,656 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2023-11-24 21:58:23,708 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 21:58:23,717 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=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@37daf7f6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 21:58:23,718 INFO L358 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2023-11-24 21:58:23,723 INFO L276 IsEmpty]: Start isEmpty. Operand has 105 states, 52 states have (on average 2.1153846153846154) internal successors, (110), 96 states have internal predecessors, (110), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 21:58:23,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-24 21:58:23,730 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:23,730 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-24 21:58:23,731 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:23,736 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:23,736 INFO L85 PathProgramCache]: Analyzing trace with hash 7152, now seen corresponding path program 1 times [2023-11-24 21:58:23,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:23,746 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542015614] [2023-11-24 21:58:23,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:23,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:23,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:23,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:23,971 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:23,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542015614] [2023-11-24 21:58:23,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542015614] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:23,973 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:23,973 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 21:58:23,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674031843] [2023-11-24 21:58:23,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:23,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 21:58:23,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:24,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 21:58:24,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,019 INFO L87 Difference]: Start difference. First operand has 105 states, 52 states have (on average 2.1153846153846154) internal successors, (110), 96 states have internal predecessors, (110), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:24,155 INFO L93 Difference]: Finished difference Result 102 states and 115 transitions. [2023-11-24 21:58:24,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 21:58:24,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-24 21:58:24,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:24,166 INFO L225 Difference]: With dead ends: 102 [2023-11-24 21:58:24,166 INFO L226 Difference]: Without dead ends: 101 [2023-11-24 21:58:24,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,172 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 79 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:24,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 87 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:24,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-24 21:58:24,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2023-11-24 21:58:24,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 51 states have (on average 2.0) internal successors, (102), 92 states have internal predecessors, (102), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 21:58:24,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 114 transitions. [2023-11-24 21:58:24,221 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 114 transitions. Word has length 2 [2023-11-24 21:58:24,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:24,221 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 114 transitions. [2023-11-24 21:58:24,221 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,222 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 114 transitions. [2023-11-24 21:58:24,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-24 21:58:24,222 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:24,222 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-24 21:58:24,222 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 21:58:24,223 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:24,224 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:24,225 INFO L85 PathProgramCache]: Analyzing trace with hash 7153, now seen corresponding path program 1 times [2023-11-24 21:58:24,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:24,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928000014] [2023-11-24 21:58:24,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:24,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:24,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:24,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:24,335 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:24,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928000014] [2023-11-24 21:58:24,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928000014] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:24,336 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:24,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-24 21:58:24,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232688544] [2023-11-24 21:58:24,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:24,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 21:58:24,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:24,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 21:58:24,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,339 INFO L87 Difference]: Start difference. First operand 101 states and 114 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:24,433 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2023-11-24 21:58:24,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 21:58:24,433 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-24 21:58:24,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:24,435 INFO L225 Difference]: With dead ends: 99 [2023-11-24 21:58:24,435 INFO L226 Difference]: Without dead ends: 99 [2023-11-24 21:58:24,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,437 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 77 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:24,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 88 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:24,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-24 21:58:24,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-24 21:58:24,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 51 states have (on average 1.9607843137254901) internal successors, (100), 90 states have internal predecessors, (100), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 21:58:24,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 112 transitions. [2023-11-24 21:58:24,451 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 112 transitions. Word has length 2 [2023-11-24 21:58:24,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:24,451 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 112 transitions. [2023-11-24 21:58:24,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,452 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 112 transitions. [2023-11-24 21:58:24,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-24 21:58:24,452 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:24,453 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:24,453 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-24 21:58:24,453 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:24,454 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:24,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1253065160, now seen corresponding path program 1 times [2023-11-24 21:58:24,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:24,454 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106238655] [2023-11-24 21:58:24,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:24,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:24,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:24,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:24,559 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:24,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106238655] [2023-11-24 21:58:24,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106238655] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:24,560 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:24,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 21:58:24,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069398802] [2023-11-24 21:58:24,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:24,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 21:58:24,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:24,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 21:58:24,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,563 INFO L87 Difference]: Start difference. First operand 99 states and 112 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:24,751 INFO L93 Difference]: Finished difference Result 157 states and 180 transitions. [2023-11-24 21:58:24,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 21:58:24,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-24 21:58:24,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:24,763 INFO L225 Difference]: With dead ends: 157 [2023-11-24 21:58:24,763 INFO L226 Difference]: Without dead ends: 157 [2023-11-24 21:58:24,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:24,765 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 69 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:24,766 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 194 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:24,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-11-24 21:58:24,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 97. [2023-11-24 21:58:24,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 51 states have (on average 1.9215686274509804) internal successors, (98), 88 states have internal predecessors, (98), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 21:58:24,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 110 transitions. [2023-11-24 21:58:24,790 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 110 transitions. Word has length 7 [2023-11-24 21:58:24,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:24,791 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 110 transitions. [2023-11-24 21:58:24,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:24,791 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 110 transitions. [2023-11-24 21:58:24,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-24 21:58:24,792 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:24,792 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:24,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-24 21:58:24,792 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:24,793 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:24,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1253065159, now seen corresponding path program 1 times [2023-11-24 21:58:24,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:24,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838066269] [2023-11-24 21:58:24,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:24,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:24,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:25,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:25,004 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:25,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838066269] [2023-11-24 21:58:25,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838066269] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:25,004 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:25,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 21:58:25,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964752185] [2023-11-24 21:58:25,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:25,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 21:58:25,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:25,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 21:58:25,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:25,007 INFO L87 Difference]: Start difference. First operand 97 states and 110 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:25,148 INFO L93 Difference]: Finished difference Result 157 states and 179 transitions. [2023-11-24 21:58:25,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 21:58:25,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-24 21:58:25,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:25,150 INFO L225 Difference]: With dead ends: 157 [2023-11-24 21:58:25,150 INFO L226 Difference]: Without dead ends: 157 [2023-11-24 21:58:25,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 21:58:25,152 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 69 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:25,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 198 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:25,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-11-24 21:58:25,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 95. [2023-11-24 21:58:25,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 51 states have (on average 1.8823529411764706) internal successors, (96), 86 states have internal predecessors, (96), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-24 21:58:25,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2023-11-24 21:58:25,165 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 7 [2023-11-24 21:58:25,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:25,165 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2023-11-24 21:58:25,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,166 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2023-11-24 21:58:25,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 21:58:25,167 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:25,167 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:25,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-24 21:58:25,167 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:25,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:25,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1602494336, now seen corresponding path program 1 times [2023-11-24 21:58:25,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:25,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135303277] [2023-11-24 21:58:25,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:25,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:25,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:25,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:25,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:25,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135303277] [2023-11-24 21:58:25,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135303277] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:25,342 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:25,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:25,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308393286] [2023-11-24 21:58:25,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:25,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:58:25,343 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:25,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:58:25,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:58:25,346 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:25,489 INFO L93 Difference]: Finished difference Result 171 states and 199 transitions. [2023-11-24 21:58:25,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:25,489 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 21:58:25,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:25,492 INFO L225 Difference]: With dead ends: 171 [2023-11-24 21:58:25,493 INFO L226 Difference]: Without dead ends: 171 [2023-11-24 21:58:25,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:25,497 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 75 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:25,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 358 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:25,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-11-24 21:58:25,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 137. [2023-11-24 21:58:25,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 88 states have (on average 1.9431818181818181) internal successors, (171), 124 states have internal predecessors, (171), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 21:58:25,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 191 transitions. [2023-11-24 21:58:25,532 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 191 transitions. Word has length 9 [2023-11-24 21:58:25,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:25,532 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 191 transitions. [2023-11-24 21:58:25,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,532 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 191 transitions. [2023-11-24 21:58:25,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 21:58:25,533 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:25,533 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:25,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-24 21:58:25,534 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:25,534 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:25,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1604775365, now seen corresponding path program 1 times [2023-11-24 21:58:25,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:25,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649542497] [2023-11-24 21:58:25,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:25,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:25,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:25,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:25,716 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:25,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649542497] [2023-11-24 21:58:25,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649542497] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:25,717 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:25,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-24 21:58:25,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216382871] [2023-11-24 21:58:25,717 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:25,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:58:25,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:25,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:58:25,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:58:25,720 INFO L87 Difference]: Start difference. First operand 137 states and 191 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:25,859 INFO L93 Difference]: Finished difference Result 136 states and 189 transitions. [2023-11-24 21:58:25,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-24 21:58:25,861 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 21:58:25,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:25,863 INFO L225 Difference]: With dead ends: 136 [2023-11-24 21:58:25,869 INFO L226 Difference]: Without dead ends: 136 [2023-11-24 21:58:25,869 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:25,872 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 204 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:25,875 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 100 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:25,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-11-24 21:58:25,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2023-11-24 21:58:25,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 88 states have (on average 1.9204545454545454) internal successors, (169), 123 states have internal predecessors, (169), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 21:58:25,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 189 transitions. [2023-11-24 21:58:25,894 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 189 transitions. Word has length 9 [2023-11-24 21:58:25,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:25,895 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 189 transitions. [2023-11-24 21:58:25,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:25,895 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 189 transitions. [2023-11-24 21:58:25,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-24 21:58:25,896 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:25,896 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:25,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-24 21:58:25,897 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:25,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:25,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1604775364, now seen corresponding path program 1 times [2023-11-24 21:58:25,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:25,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676892624] [2023-11-24 21:58:25,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:25,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:25,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:26,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:26,155 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:26,156 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676892624] [2023-11-24 21:58:26,156 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676892624] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:26,156 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:26,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 21:58:26,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734616271] [2023-11-24 21:58:26,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:26,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 21:58:26,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:26,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 21:58:26,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:26,158 INFO L87 Difference]: Start difference. First operand 136 states and 189 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:26,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:26,322 INFO L93 Difference]: Finished difference Result 135 states and 187 transitions. [2023-11-24 21:58:26,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 21:58:26,323 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-24 21:58:26,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:26,324 INFO L225 Difference]: With dead ends: 135 [2023-11-24 21:58:26,324 INFO L226 Difference]: Without dead ends: 135 [2023-11-24 21:58:26,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-24 21:58:26,328 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 275 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:26,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 87 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:58:26,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-24 21:58:26,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2023-11-24 21:58:26,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 88 states have (on average 1.8977272727272727) internal successors, (167), 122 states have internal predecessors, (167), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 21:58:26,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 187 transitions. [2023-11-24 21:58:26,337 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 187 transitions. Word has length 9 [2023-11-24 21:58:26,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:26,338 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 187 transitions. [2023-11-24 21:58:26,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:26,338 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 187 transitions. [2023-11-24 21:58:26,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 21:58:26,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:26,339 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:26,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-24 21:58:26,340 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:26,340 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:26,340 INFO L85 PathProgramCache]: Analyzing trace with hash 1953264626, now seen corresponding path program 1 times [2023-11-24 21:58:26,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:26,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883168089] [2023-11-24 21:58:26,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:26,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:26,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:26,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:26,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:26,452 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:26,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883168089] [2023-11-24 21:58:26,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883168089] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:26,453 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:26,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:26,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820297287] [2023-11-24 21:58:26,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:26,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 21:58:26,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:26,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 21:58:26,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:26,464 INFO L87 Difference]: Start difference. First operand 135 states and 187 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:26,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:26,693 INFO L93 Difference]: Finished difference Result 154 states and 179 transitions. [2023-11-24 21:58:26,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:26,694 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-24 21:58:26,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:26,695 INFO L225 Difference]: With dead ends: 154 [2023-11-24 21:58:26,695 INFO L226 Difference]: Without dead ends: 154 [2023-11-24 21:58:26,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:26,696 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 225 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:26,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 162 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:26,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2023-11-24 21:58:26,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 130. [2023-11-24 21:58:26,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 88 states have (on average 1.7727272727272727) internal successors, (156), 117 states have internal predecessors, (156), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 21:58:26,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 176 transitions. [2023-11-24 21:58:26,703 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 176 transitions. Word has length 14 [2023-11-24 21:58:26,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:26,703 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 176 transitions. [2023-11-24 21:58:26,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:26,704 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 176 transitions. [2023-11-24 21:58:26,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 21:58:26,704 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:26,704 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:26,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-24 21:58:26,705 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:26,705 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:26,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1953264627, now seen corresponding path program 1 times [2023-11-24 21:58:26,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:26,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114939639] [2023-11-24 21:58:26,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:26,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:26,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:26,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:26,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:26,842 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:26,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114939639] [2023-11-24 21:58:26,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114939639] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:26,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:26,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:26,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541699782] [2023-11-24 21:58:26,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:26,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 21:58:26,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:26,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 21:58:26,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:26,844 INFO L87 Difference]: Start difference. First operand 130 states and 176 transitions. Second operand has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:27,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:27,138 INFO L93 Difference]: Finished difference Result 150 states and 174 transitions. [2023-11-24 21:58:27,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:27,139 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-24 21:58:27,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:27,140 INFO L225 Difference]: With dead ends: 150 [2023-11-24 21:58:27,140 INFO L226 Difference]: Without dead ends: 150 [2023-11-24 21:58:27,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:27,141 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 193 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:27,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 218 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:27,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2023-11-24 21:58:27,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 130. [2023-11-24 21:58:27,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 88 states have (on average 1.7045454545454546) internal successors, (150), 117 states have internal predecessors, (150), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 21:58:27,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2023-11-24 21:58:27,148 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 14 [2023-11-24 21:58:27,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:27,148 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2023-11-24 21:58:27,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:27,149 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2023-11-24 21:58:27,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-24 21:58:27,149 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:27,150 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:27,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-24 21:58:27,150 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:27,150 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:27,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1421240894, now seen corresponding path program 1 times [2023-11-24 21:58:27,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:27,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608244029] [2023-11-24 21:58:27,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:27,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:27,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:27,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:27,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:27,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608244029] [2023-11-24 21:58:27,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608244029] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:27,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976432346] [2023-11-24 21:58:27,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:27,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:27,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:27,295 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:27,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 21:58:27,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:27,426 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-24 21:58:27,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:27,494 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 6 treesize of output 5 [2023-11-24 21:58:27,581 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-24 21:58:27,581 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-24 21:58:27,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:27,854 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:28,119 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:28,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976432346] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 21:58:28,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 21:58:28,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 14 [2023-11-24 21:58:28,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113661108] [2023-11-24 21:58:28,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:28,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-24 21:58:28,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:28,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-24 21:58:28,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2023-11-24 21:58:28,122 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand has 15 states, 14 states have (on average 3.0) internal successors, (42), 12 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:28,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:28,775 INFO L93 Difference]: Finished difference Result 227 states and 305 transitions. [2023-11-24 21:58:28,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 21:58:28,776 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 12 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-24 21:58:28,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:28,778 INFO L225 Difference]: With dead ends: 227 [2023-11-24 21:58:28,778 INFO L226 Difference]: Without dead ends: 227 [2023-11-24 21:58:28,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2023-11-24 21:58:28,780 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 347 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:28,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [348 Valid, 464 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 21:58:28,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2023-11-24 21:58:28,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 138. [2023-11-24 21:58:28,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 95 states have (on average 1.6842105263157894) internal successors, (160), 123 states have internal predecessors, (160), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-24 21:58:28,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 182 transitions. [2023-11-24 21:58:28,789 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 182 transitions. Word has length 17 [2023-11-24 21:58:28,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:28,789 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 182 transitions. [2023-11-24 21:58:28,789 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 12 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:28,790 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 182 transitions. [2023-11-24 21:58:28,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-24 21:58:28,790 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:28,791 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:28,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 21:58:28,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:28,997 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:28,998 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:28,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1421240895, now seen corresponding path program 1 times [2023-11-24 21:58:28,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:28,998 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055853740] [2023-11-24 21:58:28,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:28,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:29,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:29,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:29,216 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:29,216 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055853740] [2023-11-24 21:58:29,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055853740] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:29,217 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700362114] [2023-11-24 21:58:29,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:29,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:29,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:29,220 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:29,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 21:58:29,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:29,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-24 21:58:29,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:29,393 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-24 21:58:29,393 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-24 21:58:29,615 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:29,616 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:29,968 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 17 treesize of output 13 [2023-11-24 21:58:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:29,979 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700362114] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 21:58:29,979 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 21:58:29,979 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 14 [2023-11-24 21:58:29,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367245620] [2023-11-24 21:58:29,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:29,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-24 21:58:29,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:29,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-24 21:58:29,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2023-11-24 21:58:29,981 INFO L87 Difference]: Start difference. First operand 138 states and 182 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:30,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:30,636 INFO L93 Difference]: Finished difference Result 224 states and 302 transitions. [2023-11-24 21:58:30,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-24 21:58:30,637 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-24 21:58:30,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:30,639 INFO L225 Difference]: With dead ends: 224 [2023-11-24 21:58:30,639 INFO L226 Difference]: Without dead ends: 224 [2023-11-24 21:58:30,640 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2023-11-24 21:58:30,640 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 406 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 593 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:30,641 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [407 Valid, 388 Invalid, 645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 593 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 21:58:30,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-11-24 21:58:30,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 137. [2023-11-24 21:58:30,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 95 states have (on average 1.6526315789473685) internal successors, (157), 122 states have internal predecessors, (157), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-24 21:58:30,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 179 transitions. [2023-11-24 21:58:30,649 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 179 transitions. Word has length 17 [2023-11-24 21:58:30,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:30,649 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 179 transitions. [2023-11-24 21:58:30,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:30,649 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 179 transitions. [2023-11-24 21:58:30,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-24 21:58:30,650 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:30,650 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:30,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 21:58:30,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:30,856 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:30,857 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:30,857 INFO L85 PathProgramCache]: Analyzing trace with hash -1067236618, now seen corresponding path program 1 times [2023-11-24 21:58:30,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:30,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249859661] [2023-11-24 21:58:30,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:30,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:30,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:31,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:31,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:31,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:31,127 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:31,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249859661] [2023-11-24 21:58:31,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249859661] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:31,128 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:31,128 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-24 21:58:31,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104035331] [2023-11-24 21:58:31,129 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:31,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 21:58:31,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:31,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 21:58:31,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-24 21:58:31,131 INFO L87 Difference]: Start difference. First operand 137 states and 179 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:31,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:31,354 INFO L93 Difference]: Finished difference Result 186 states and 238 transitions. [2023-11-24 21:58:31,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 21:58:31,355 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-11-24 21:58:31,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:31,357 INFO L225 Difference]: With dead ends: 186 [2023-11-24 21:58:31,357 INFO L226 Difference]: Without dead ends: 186 [2023-11-24 21:58:31,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-24 21:58:31,358 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 160 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:31,358 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 314 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:31,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2023-11-24 21:58:31,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 146. [2023-11-24 21:58:31,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 103 states have (on average 1.6213592233009708) internal successors, (167), 130 states have internal predecessors, (167), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-24 21:58:31,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 191 transitions. [2023-11-24 21:58:31,368 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 191 transitions. Word has length 18 [2023-11-24 21:58:31,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:31,369 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 191 transitions. [2023-11-24 21:58:31,369 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:31,369 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 191 transitions. [2023-11-24 21:58:31,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-24 21:58:31,373 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:31,373 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:31,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-24 21:58:31,374 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:31,374 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:31,374 INFO L85 PathProgramCache]: Analyzing trace with hash 1238811032, now seen corresponding path program 1 times [2023-11-24 21:58:31,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:31,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445457296] [2023-11-24 21:58:31,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:31,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:31,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:31,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:31,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:31,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:31,705 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:31,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445457296] [2023-11-24 21:58:31,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445457296] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:31,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:31,706 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-24 21:58:31,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061351302] [2023-11-24 21:58:31,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:31,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 21:58:31,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:31,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 21:58:31,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-24 21:58:31,711 INFO L87 Difference]: Start difference. First operand 146 states and 191 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:31,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:31,940 INFO L93 Difference]: Finished difference Result 181 states and 232 transitions. [2023-11-24 21:58:31,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 21:58:31,941 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2023-11-24 21:58:31,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:31,943 INFO L225 Difference]: With dead ends: 181 [2023-11-24 21:58:31,943 INFO L226 Difference]: Without dead ends: 181 [2023-11-24 21:58:31,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-24 21:58:31,944 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 110 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:31,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 366 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:31,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2023-11-24 21:58:31,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 148. [2023-11-24 21:58:31,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 105 states have (on average 1.6095238095238096) internal successors, (169), 132 states have internal predecessors, (169), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-24 21:58:31,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 193 transitions. [2023-11-24 21:58:31,952 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 193 transitions. Word has length 20 [2023-11-24 21:58:31,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:31,953 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 193 transitions. [2023-11-24 21:58:31,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:31,953 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 193 transitions. [2023-11-24 21:58:31,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-24 21:58:31,954 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:31,955 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:31,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-24 21:58:31,955 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:31,956 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:31,956 INFO L85 PathProgramCache]: Analyzing trace with hash 1620594932, now seen corresponding path program 1 times [2023-11-24 21:58:31,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:31,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939561688] [2023-11-24 21:58:31,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:31,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:31,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:32,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:58:32,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:32,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:32,089 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:32,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939561688] [2023-11-24 21:58:32,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939561688] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:32,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112810263] [2023-11-24 21:58:32,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:32,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:32,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:32,091 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:32,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 21:58:32,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:32,222 INFO L262 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-24 21:58:32,223 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:32,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:32,318 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:32,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:32,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112810263] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 21:58:32,486 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 21:58:32,486 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2023-11-24 21:58:32,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647374398] [2023-11-24 21:58:32,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:32,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-24 21:58:32,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:32,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-24 21:58:32,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2023-11-24 21:58:32,488 INFO L87 Difference]: Start difference. First operand 148 states and 193 transitions. Second operand has 16 states, 16 states have (on average 3.1875) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 21:58:33,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:33,478 INFO L93 Difference]: Finished difference Result 281 states and 332 transitions. [2023-11-24 21:58:33,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-24 21:58:33,479 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2023-11-24 21:58:33,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:33,482 INFO L225 Difference]: With dead ends: 281 [2023-11-24 21:58:33,482 INFO L226 Difference]: Without dead ends: 279 [2023-11-24 21:58:33,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2023-11-24 21:58:33,484 INFO L413 NwaCegarLoop]: 147 mSDtfsCounter, 363 mSDsluCounter, 947 mSDsCounter, 0 mSdLazyCounter, 1151 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 1094 SdHoareTripleChecker+Invalid, 1192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:33,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 1094 Invalid, 1192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1151 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-24 21:58:33,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2023-11-24 21:58:33,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 148. [2023-11-24 21:58:33,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 105 states have (on average 1.6) internal successors, (168), 132 states have internal predecessors, (168), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-24 21:58:33,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 192 transitions. [2023-11-24 21:58:33,497 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 192 transitions. Word has length 22 [2023-11-24 21:58:33,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:33,498 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 192 transitions. [2023-11-24 21:58:33,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 16 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-24 21:58:33,498 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 192 transitions. [2023-11-24 21:58:33,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-24 21:58:33,499 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:33,500 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:33,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 21:58:33,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-24 21:58:33,707 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:33,707 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:33,707 INFO L85 PathProgramCache]: Analyzing trace with hash 1972917388, now seen corresponding path program 1 times [2023-11-24 21:58:33,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:33,708 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399200459] [2023-11-24 21:58:33,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:33,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:33,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:34,211 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:34,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:34,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399200459] [2023-11-24 21:58:34,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399200459] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:34,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143066191] [2023-11-24 21:58:34,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:34,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:34,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:34,214 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:34,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 21:58:34,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:34,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-24 21:58:34,348 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:34,380 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 6 treesize of output 5 [2023-11-24 21:58:34,444 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 19 treesize of output 1 [2023-11-24 21:58:34,528 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 21 treesize of output 9 [2023-11-24 21:58:34,581 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:34,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:34,620 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 28 [2023-11-24 21:58:34,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:34,753 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143066191] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 21:58:34,753 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 21:58:34,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 20 [2023-11-24 21:58:34,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886343075] [2023-11-24 21:58:34,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:34,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-24 21:58:34,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:34,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-24 21:58:34,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2023-11-24 21:58:34,756 INFO L87 Difference]: Start difference. First operand 148 states and 192 transitions. Second operand has 21 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:36,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:36,859 INFO L93 Difference]: Finished difference Result 526 states and 694 transitions. [2023-11-24 21:58:36,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-24 21:58:36,859 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-24 21:58:36,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:36,863 INFO L225 Difference]: With dead ends: 526 [2023-11-24 21:58:36,863 INFO L226 Difference]: Without dead ends: 526 [2023-11-24 21:58:36,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=189, Invalid=1071, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 21:58:36,865 INFO L413 NwaCegarLoop]: 200 mSDtfsCounter, 557 mSDsluCounter, 1795 mSDsCounter, 0 mSdLazyCounter, 2311 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 569 SdHoareTripleChecker+Valid, 1995 SdHoareTripleChecker+Invalid, 2370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 2311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:36,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [569 Valid, 1995 Invalid, 2370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 2311 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-24 21:58:36,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2023-11-24 21:58:36,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 198. [2023-11-24 21:58:36,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 144 states have (on average 1.5833333333333333) internal successors, (228), 173 states have internal predecessors, (228), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 17 states have call predecessors, (20), 20 states have call successors, (20) [2023-11-24 21:58:36,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 268 transitions. [2023-11-24 21:58:36,881 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 268 transitions. Word has length 23 [2023-11-24 21:58:36,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:36,881 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 268 transitions. [2023-11-24 21:58:36,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 4 states have call successors, (4), 4 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:36,882 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 268 transitions. [2023-11-24 21:58:36,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-24 21:58:36,883 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:36,883 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:36,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 21:58:37,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:37,094 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:37,095 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:37,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1972917389, now seen corresponding path program 1 times [2023-11-24 21:58:37,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:37,095 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369271889] [2023-11-24 21:58:37,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:37,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:37,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:37,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:37,550 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:37,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369271889] [2023-11-24 21:58:37,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369271889] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:37,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398877374] [2023-11-24 21:58:37,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:37,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:37,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:37,555 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:37,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-24 21:58:37,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:37,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 59 conjunts are in the unsatisfiable core [2023-11-24 21:58:37,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:37,765 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-24 21:58:37,773 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 13 treesize of output 9 [2023-11-24 21:58:37,940 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 7 [2023-11-24 21:58:38,025 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:38,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:38,213 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 21 [2023-11-24 21:58:38,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 21:58:38,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 21:58:38,243 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:38,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398877374] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 21:58:38,243 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 21:58:38,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10] total 24 [2023-11-24 21:58:38,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781727521] [2023-11-24 21:58:38,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:38,244 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-24 21:58:38,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:38,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-24 21:58:38,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2023-11-24 21:58:38,246 INFO L87 Difference]: Start difference. First operand 198 states and 268 transitions. Second operand has 24 states, 22 states have (on average 2.5) internal successors, (55), 19 states have internal predecessors, (55), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:39,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:39,923 INFO L93 Difference]: Finished difference Result 452 states and 605 transitions. [2023-11-24 21:58:39,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 21:58:39,924 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.5) internal successors, (55), 19 states have internal predecessors, (55), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-24 21:58:39,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:39,930 INFO L225 Difference]: With dead ends: 452 [2023-11-24 21:58:39,931 INFO L226 Difference]: Without dead ends: 452 [2023-11-24 21:58:39,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=144, Invalid=912, Unknown=0, NotChecked=0, Total=1056 [2023-11-24 21:58:39,932 INFO L413 NwaCegarLoop]: 218 mSDtfsCounter, 273 mSDsluCounter, 2981 mSDsCounter, 0 mSdLazyCounter, 1748 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 3199 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:39,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [280 Valid, 3199 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1748 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-11-24 21:58:39,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2023-11-24 21:58:39,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 235. [2023-11-24 21:58:39,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 174 states have (on average 1.5689655172413792) internal successors, (273), 204 states have internal predecessors, (273), 25 states have call successors, (25), 9 states have call predecessors, (25), 9 states have return successors, (25), 21 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-24 21:58:39,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 323 transitions. [2023-11-24 21:58:39,954 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 323 transitions. Word has length 23 [2023-11-24 21:58:39,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:39,956 INFO L495 AbstractCegarLoop]: Abstraction has 235 states and 323 transitions. [2023-11-24 21:58:39,956 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.5) internal successors, (55), 19 states have internal predecessors, (55), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 21:58:39,957 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 323 transitions. [2023-11-24 21:58:39,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 21:58:39,958 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:39,959 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:39,972 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-24 21:58:40,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-24 21:58:40,172 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:40,173 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:40,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1070985818, now seen corresponding path program 1 times [2023-11-24 21:58:40,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:40,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229200924] [2023-11-24 21:58:40,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:40,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:40,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:40,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:40,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229200924] [2023-11-24 21:58:40,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229200924] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:40,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:40,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:40,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348258503] [2023-11-24 21:58:40,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:40,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:58:40,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:40,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:58:40,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:58:40,256 INFO L87 Difference]: Start difference. First operand 235 states and 323 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:40,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:40,310 INFO L93 Difference]: Finished difference Result 249 states and 341 transitions. [2023-11-24 21:58:40,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:40,310 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-11-24 21:58:40,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:40,312 INFO L225 Difference]: With dead ends: 249 [2023-11-24 21:58:40,313 INFO L226 Difference]: Without dead ends: 249 [2023-11-24 21:58:40,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:40,314 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 6 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:40,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 346 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 21:58:40,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2023-11-24 21:58:40,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 244. [2023-11-24 21:58:40,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 177 states have (on average 1.5593220338983051) internal successors, (276), 212 states have internal predecessors, (276), 30 states have call successors, (30), 10 states have call predecessors, (30), 10 states have return successors, (30), 21 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-24 21:58:40,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 336 transitions. [2023-11-24 21:58:40,324 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 336 transitions. Word has length 24 [2023-11-24 21:58:40,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:40,325 INFO L495 AbstractCegarLoop]: Abstraction has 244 states and 336 transitions. [2023-11-24 21:58:40,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:40,325 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 336 transitions. [2023-11-24 21:58:40,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 21:58:40,327 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:40,328 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:40,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-24 21:58:40,328 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:40,328 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:40,328 INFO L85 PathProgramCache]: Analyzing trace with hash -2057498976, now seen corresponding path program 1 times [2023-11-24 21:58:40,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:40,329 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947532912] [2023-11-24 21:58:40,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:40,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:40,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:58:40,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:40,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:40,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947532912] [2023-11-24 21:58:40,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947532912] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:40,417 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:40,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 21:58:40,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139491374] [2023-11-24 21:58:40,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:40,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:58:40,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:40,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:58:40,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:58:40,419 INFO L87 Difference]: Start difference. First operand 244 states and 336 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:40,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:40,683 INFO L93 Difference]: Finished difference Result 388 states and 558 transitions. [2023-11-24 21:58:40,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:40,684 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-11-24 21:58:40,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:40,688 INFO L225 Difference]: With dead ends: 388 [2023-11-24 21:58:40,689 INFO L226 Difference]: Without dead ends: 388 [2023-11-24 21:58:40,689 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:40,690 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 136 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:40,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 193 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:40,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2023-11-24 21:58:40,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 243. [2023-11-24 21:58:40,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 177 states have (on average 1.5480225988700564) internal successors, (274), 211 states have internal predecessors, (274), 30 states have call successors, (30), 10 states have call predecessors, (30), 10 states have return successors, (30), 21 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-24 21:58:40,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 334 transitions. [2023-11-24 21:58:40,708 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 334 transitions. Word has length 24 [2023-11-24 21:58:40,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:40,709 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 334 transitions. [2023-11-24 21:58:40,709 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:40,709 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 334 transitions. [2023-11-24 21:58:40,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-24 21:58:40,711 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:40,711 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:58:40,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-24 21:58:40,712 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:40,712 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:40,713 INFO L85 PathProgramCache]: Analyzing trace with hash -2057498975, now seen corresponding path program 1 times [2023-11-24 21:58:40,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:40,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695232052] [2023-11-24 21:58:40,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:40,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:40,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:58:40,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:40,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:40,883 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:40,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695232052] [2023-11-24 21:58:40,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695232052] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:40,884 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:40,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 21:58:40,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970012893] [2023-11-24 21:58:40,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:40,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:58:40,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:40,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:58:40,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:58:40,885 INFO L87 Difference]: Start difference. First operand 243 states and 334 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:41,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:41,319 INFO L93 Difference]: Finished difference Result 418 states and 549 transitions. [2023-11-24 21:58:41,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 21:58:41,320 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2023-11-24 21:58:41,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:41,323 INFO L225 Difference]: With dead ends: 418 [2023-11-24 21:58:41,323 INFO L226 Difference]: Without dead ends: 418 [2023-11-24 21:58:41,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:41,324 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 121 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 377 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:41,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 456 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 377 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-24 21:58:41,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2023-11-24 21:58:41,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 237. [2023-11-24 21:58:41,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 177 states have (on average 1.497175141242938) internal successors, (265), 205 states have internal predecessors, (265), 30 states have call successors, (30), 10 states have call predecessors, (30), 10 states have return successors, (30), 21 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-24 21:58:41,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 325 transitions. [2023-11-24 21:58:41,336 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 325 transitions. Word has length 24 [2023-11-24 21:58:41,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:41,337 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 325 transitions. [2023-11-24 21:58:41,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:58:41,337 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 325 transitions. [2023-11-24 21:58:41,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 21:58:41,338 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:41,338 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:58:41,338 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-11-24 21:58:41,338 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr26REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:41,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:41,339 INFO L85 PathProgramCache]: Analyzing trace with hash 1553795544, now seen corresponding path program 1 times [2023-11-24 21:58:41,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:41,339 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604641759] [2023-11-24 21:58:41,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:41,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:41,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:41,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-11-24 21:58:41,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:41,417 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:41,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604641759] [2023-11-24 21:58:41,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604641759] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:41,418 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:41,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:41,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845599744] [2023-11-24 21:58:41,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:41,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 21:58:41,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:41,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 21:58:41,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:41,420 INFO L87 Difference]: Start difference. First operand 237 states and 325 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:41,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:41,630 INFO L93 Difference]: Finished difference Result 248 states and 317 transitions. [2023-11-24 21:58:41,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:41,631 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-11-24 21:58:41,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:41,632 INFO L225 Difference]: With dead ends: 248 [2023-11-24 21:58:41,633 INFO L226 Difference]: Without dead ends: 248 [2023-11-24 21:58:41,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:41,633 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 173 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:41,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 172 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:41,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2023-11-24 21:58:41,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 234. [2023-11-24 21:58:41,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 177 states have (on average 1.4350282485875707) internal successors, (254), 202 states have internal predecessors, (254), 30 states have call successors, (30), 10 states have call predecessors, (30), 10 states have return successors, (30), 21 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-24 21:58:41,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 314 transitions. [2023-11-24 21:58:41,644 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 314 transitions. Word has length 26 [2023-11-24 21:58:41,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:41,644 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 314 transitions. [2023-11-24 21:58:41,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:41,645 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 314 transitions. [2023-11-24 21:58:41,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 21:58:41,645 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:41,645 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:58:41,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-11-24 21:58:41,646 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr27REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:41,646 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:41,647 INFO L85 PathProgramCache]: Analyzing trace with hash 1553795545, now seen corresponding path program 1 times [2023-11-24 21:58:41,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:41,647 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244604320] [2023-11-24 21:58:41,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:41,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:41,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:58:41,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-11-24 21:58:41,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:41,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:41,799 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:41,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244604320] [2023-11-24 21:58:41,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244604320] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:58:41,799 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:58:41,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:58:41,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300477030] [2023-11-24 21:58:41,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:58:41,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-24 21:58:41,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:41,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-24 21:58:41,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:58:41,801 INFO L87 Difference]: Start difference. First operand 234 states and 314 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:42,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:42,035 INFO L93 Difference]: Finished difference Result 246 states and 312 transitions. [2023-11-24 21:58:42,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 21:58:42,035 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-11-24 21:58:42,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:42,037 INFO L225 Difference]: With dead ends: 246 [2023-11-24 21:58:42,037 INFO L226 Difference]: Without dead ends: 246 [2023-11-24 21:58:42,038 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-24 21:58:42,039 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 194 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:42,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 158 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:58:42,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2023-11-24 21:58:42,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 234. [2023-11-24 21:58:42,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 177 states have (on average 1.4011299435028248) internal successors, (248), 202 states have internal predecessors, (248), 30 states have call successors, (30), 10 states have call predecessors, (30), 10 states have return successors, (30), 21 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-24 21:58:42,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 308 transitions. [2023-11-24 21:58:42,051 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 308 transitions. Word has length 26 [2023-11-24 21:58:42,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:42,051 INFO L495 AbstractCegarLoop]: Abstraction has 234 states and 308 transitions. [2023-11-24 21:58:42,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:42,052 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 308 transitions. [2023-11-24 21:58:42,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 21:58:42,052 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:42,053 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:58:42,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-11-24 21:58:42,053 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:42,054 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:42,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1791527674, now seen corresponding path program 1 times [2023-11-24 21:58:42,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:42,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080868061] [2023-11-24 21:58:42,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:42,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:42,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:42,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:58:42,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:42,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:42,944 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:42,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080868061] [2023-11-24 21:58:42,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080868061] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:42,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640882956] [2023-11-24 21:58:42,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:42,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:42,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:42,947 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:42,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-24 21:58:43,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:43,089 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-24 21:58:43,092 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:43,140 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 6 treesize of output 5 [2023-11-24 21:58:43,202 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 19 treesize of output 1 [2023-11-24 21:58:43,535 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 21:58:43,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 17 [2023-11-24 21:58:43,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:43,592 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:43,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640882956] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:43,746 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 21:58:43,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 21 [2023-11-24 21:58:43,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331488250] [2023-11-24 21:58:43,747 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:43,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-24 21:58:43,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:43,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-24 21:58:43,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2023-11-24 21:58:43,749 INFO L87 Difference]: Start difference. First operand 234 states and 308 transitions. Second operand has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:46,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:58:46,336 INFO L93 Difference]: Finished difference Result 457 states and 569 transitions. [2023-11-24 21:58:46,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-24 21:58:46,337 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-11-24 21:58:46,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:58:46,340 INFO L225 Difference]: With dead ends: 457 [2023-11-24 21:58:46,340 INFO L226 Difference]: Without dead ends: 457 [2023-11-24 21:58:46,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=312, Invalid=1094, Unknown=0, NotChecked=0, Total=1406 [2023-11-24 21:58:46,342 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 600 mSDsluCounter, 1246 mSDsCounter, 0 mSdLazyCounter, 1566 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 605 SdHoareTripleChecker+Valid, 1345 SdHoareTripleChecker+Invalid, 1655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 1566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-24 21:58:46,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [605 Valid, 1345 Invalid, 1655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 1566 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-24 21:58:46,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2023-11-24 21:58:46,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 306. [2023-11-24 21:58:46,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 232 states have (on average 1.3663793103448276) internal successors, (317), 261 states have internal predecessors, (317), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 29 states have call predecessors, (42), 42 states have call successors, (42) [2023-11-24 21:58:46,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 401 transitions. [2023-11-24 21:58:46,354 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 401 transitions. Word has length 26 [2023-11-24 21:58:46,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:58:46,355 INFO L495 AbstractCegarLoop]: Abstraction has 306 states and 401 transitions. [2023-11-24 21:58:46,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.238095238095238) internal successors, (47), 22 states have internal predecessors, (47), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:46,355 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 401 transitions. [2023-11-24 21:58:46,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 21:58:46,356 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:58:46,356 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:58:46,362 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-24 21:58:46,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-11-24 21:58:46,562 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:58:46,563 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:58:46,563 INFO L85 PathProgramCache]: Analyzing trace with hash 1791527675, now seen corresponding path program 1 times [2023-11-24 21:58:46,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:58:46,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672504296] [2023-11-24 21:58:46,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:46,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:58:46,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:47,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:58:47,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:47,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:47,644 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:58:47,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672504296] [2023-11-24 21:58:47,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672504296] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:47,644 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694799740] [2023-11-24 21:58:47,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:58:47,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:58:47,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:58:47,646 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:58:47,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-24 21:58:47,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:58:47,781 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-24 21:58:47,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:58:47,925 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 19 treesize of output 1 [2023-11-24 21:58:47,932 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 19 treesize of output 1 [2023-11-24 21:58:48,304 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 21:58:48,305 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 25 [2023-11-24 21:58:48,317 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 21:58:48,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 22 [2023-11-24 21:58:48,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:58:48,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 21:58:48,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694799740] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:58:48,852 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-24 21:58:48,852 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 22 [2023-11-24 21:58:48,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756148175] [2023-11-24 21:58:48,852 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-24 21:58:48,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-24 21:58:48,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:58:48,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-24 21:58:48,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2023-11-24 21:58:48,855 INFO L87 Difference]: Start difference. First operand 306 states and 401 transitions. Second operand has 23 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:58:52,874 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 21:58:57,267 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 21:59:03,459 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 21:59:05,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:59:05,278 INFO L93 Difference]: Finished difference Result 546 states and 681 transitions. [2023-11-24 21:59:05,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-24 21:59:05,279 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-11-24 21:59:05,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:59:05,283 INFO L225 Difference]: With dead ends: 546 [2023-11-24 21:59:05,283 INFO L226 Difference]: Without dead ends: 546 [2023-11-24 21:59:05,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 453 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=478, Invalid=1684, Unknown=0, NotChecked=0, Total=2162 [2023-11-24 21:59:05,286 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 756 mSDsluCounter, 932 mSDsCounter, 0 mSdLazyCounter, 1595 mSolverCounterSat, 108 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 761 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 1706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 1595 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.5s IncrementalHoareTripleChecker+Time [2023-11-24 21:59:05,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [761 Valid, 1021 Invalid, 1706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 1595 Invalid, 3 Unknown, 0 Unchecked, 14.5s Time] [2023-11-24 21:59:05,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2023-11-24 21:59:05,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 375. [2023-11-24 21:59:05,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 282 states have (on average 1.3475177304964538) internal successors, (380), 315 states have internal predecessors, (380), 54 states have call successors, (54), 22 states have call predecessors, (54), 22 states have return successors, (54), 37 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-24 21:59:05,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 488 transitions. [2023-11-24 21:59:05,307 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 488 transitions. Word has length 26 [2023-11-24 21:59:05,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:59:05,308 INFO L495 AbstractCegarLoop]: Abstraction has 375 states and 488 transitions. [2023-11-24 21:59:05,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:59:05,308 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 488 transitions. [2023-11-24 21:59:05,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-24 21:59:05,310 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:59:05,310 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:59:05,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-24 21:59:05,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:59:05,517 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr30REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:59:05,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:59:05,517 INFO L85 PathProgramCache]: Analyzing trace with hash -2034369621, now seen corresponding path program 1 times [2023-11-24 21:59:05,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:59:05,518 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360460212] [2023-11-24 21:59:05,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:59:05,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:59:05,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:05,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:59:05,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:05,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-11-24 21:59:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:05,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:59:05,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:59:05,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360460212] [2023-11-24 21:59:05,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360460212] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:59:05,902 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:59:05,902 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-24 21:59:05,902 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291817920] [2023-11-24 21:59:05,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:59:05,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 21:59:05,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:59:05,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 21:59:05,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-24 21:59:05,907 INFO L87 Difference]: Start difference. First operand 375 states and 488 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:59:06,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:59:06,163 INFO L93 Difference]: Finished difference Result 398 states and 517 transitions. [2023-11-24 21:59:06,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-24 21:59:06,166 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2023-11-24 21:59:06,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:59:06,169 INFO L225 Difference]: With dead ends: 398 [2023-11-24 21:59:06,169 INFO L226 Difference]: Without dead ends: 398 [2023-11-24 21:59:06,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-24 21:59:06,171 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 115 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-24 21:59:06,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 264 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-24 21:59:06,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2023-11-24 21:59:06,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 384. [2023-11-24 21:59:06,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 288 states have (on average 1.3402777777777777) internal successors, (386), 322 states have internal predecessors, (386), 57 states have call successors, (57), 22 states have call predecessors, (57), 22 states have return successors, (57), 39 states have call predecessors, (57), 57 states have call successors, (57) [2023-11-24 21:59:06,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 500 transitions. [2023-11-24 21:59:06,196 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 500 transitions. Word has length 29 [2023-11-24 21:59:06,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:59:06,197 INFO L495 AbstractCegarLoop]: Abstraction has 384 states and 500 transitions. [2023-11-24 21:59:06,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:59:06,197 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 500 transitions. [2023-11-24 21:59:06,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-24 21:59:06,198 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:59:06,199 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 21:59:06,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-11-24 21:59:06,199 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:59:06,200 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:59:06,200 INFO L85 PathProgramCache]: Analyzing trace with hash -1507632494, now seen corresponding path program 1 times [2023-11-24 21:59:06,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:59:06,200 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049945293] [2023-11-24 21:59:06,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:59:06,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:59:06,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:06,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2023-11-24 21:59:06,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:06,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2023-11-24 21:59:06,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:06,281 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-24 21:59:06,281 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:59:06,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049945293] [2023-11-24 21:59:06,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049945293] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:59:06,282 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:59:06,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-24 21:59:06,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108744252] [2023-11-24 21:59:06,282 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:59:06,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-24 21:59:06,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:59:06,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-24 21:59:06,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-24 21:59:06,284 INFO L87 Difference]: Start difference. First operand 384 states and 500 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:59:06,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:59:06,368 INFO L93 Difference]: Finished difference Result 383 states and 480 transitions. [2023-11-24 21:59:06,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 21:59:06,369 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2023-11-24 21:59:06,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:59:06,372 INFO L225 Difference]: With dead ends: 383 [2023-11-24 21:59:06,372 INFO L226 Difference]: Without dead ends: 383 [2023-11-24 21:59:06,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:59:06,373 INFO L413 NwaCegarLoop]: 81 mSDtfsCounter, 37 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 21:59:06,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 235 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 21:59:06,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2023-11-24 21:59:06,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 369. [2023-11-24 21:59:06,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 283 states have (on average 1.3286219081272084) internal successors, (376), 312 states have internal predecessors, (376), 47 states have call successors, (47), 22 states have call predecessors, (47), 22 states have return successors, (47), 34 states have call predecessors, (47), 47 states have call successors, (47) [2023-11-24 21:59:06,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 470 transitions. [2023-11-24 21:59:06,396 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 470 transitions. Word has length 30 [2023-11-24 21:59:06,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:59:06,397 INFO L495 AbstractCegarLoop]: Abstraction has 369 states and 470 transitions. [2023-11-24 21:59:06,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-24 21:59:06,398 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 470 transitions. [2023-11-24 21:59:06,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 21:59:06,399 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:59:06,399 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:59:06,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-11-24 21:59:06,400 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:59:06,401 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:59:06,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1560991396, now seen corresponding path program 1 times [2023-11-24 21:59:06,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:59:06,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67848207] [2023-11-24 21:59:06,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:59:06,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:59:06,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:06,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:59:06,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:06,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-24 21:59:06,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:59:06,629 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67848207] [2023-11-24 21:59:06,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67848207] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 21:59:06,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 21:59:06,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-24 21:59:06,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010673635] [2023-11-24 21:59:06,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 21:59:06,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-24 21:59:06,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-24 21:59:06,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-24 21:59:06,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-24 21:59:06,632 INFO L87 Difference]: Start difference. First operand 369 states and 470 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:59:06,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 21:59:06,695 INFO L93 Difference]: Finished difference Result 391 states and 499 transitions. [2023-11-24 21:59:06,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-24 21:59:06,695 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2023-11-24 21:59:06,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 21:59:06,699 INFO L225 Difference]: With dead ends: 391 [2023-11-24 21:59:06,699 INFO L226 Difference]: Without dead ends: 383 [2023-11-24 21:59:06,699 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-24 21:59:06,702 INFO L413 NwaCegarLoop]: 85 mSDtfsCounter, 1 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 21:59:06,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 330 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 21:59:06,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2023-11-24 21:59:06,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 377. [2023-11-24 21:59:06,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 287 states have (on average 1.32404181184669) internal successors, (380), 320 states have internal predecessors, (380), 47 states have call successors, (47), 22 states have call predecessors, (47), 26 states have return successors, (55), 34 states have call predecessors, (55), 47 states have call successors, (55) [2023-11-24 21:59:06,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 482 transitions. [2023-11-24 21:59:06,752 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 482 transitions. Word has length 28 [2023-11-24 21:59:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 21:59:06,752 INFO L495 AbstractCegarLoop]: Abstraction has 377 states and 482 transitions. [2023-11-24 21:59:06,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 21:59:06,753 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 482 transitions. [2023-11-24 21:59:06,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-24 21:59:06,754 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 21:59:06,754 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-24 21:59:06,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-11-24 21:59:06,755 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-24 21:59:06,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 21:59:06,755 INFO L85 PathProgramCache]: Analyzing trace with hash -267773796, now seen corresponding path program 1 times [2023-11-24 21:59:06,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-24 21:59:06,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181100019] [2023-11-24 21:59:06,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:59:06,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 21:59:06,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:07,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-24 21:59:07,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:07,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:59:07,559 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-24 21:59:07,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181100019] [2023-11-24 21:59:07,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181100019] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 21:59:07,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355701243] [2023-11-24 21:59:07,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 21:59:07,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 21:59:07,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 [2023-11-24 21:59:07,562 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 21:59:07,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_41039636-e190-469b-a9cc-c07b5ed6fdc4/bin/uautomizer-verify-NlZe1sFDwI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-24 21:59:07,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 21:59:07,744 INFO L262 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 52 conjunts are in the unsatisfiable core [2023-11-24 21:59:07,748 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 21:59:07,755 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 6 treesize of output 5 [2023-11-24 21:59:07,789 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 [2023-11-24 21:59:07,800 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 [2023-11-24 21:59:07,820 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 19 treesize of output 18 [2023-11-24 21:59:07,836 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 19 treesize of output 18 [2023-11-24 21:59:07,940 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-24 21:59:07,940 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 17 treesize of output 21 [2023-11-24 21:59:08,043 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 23 treesize of output 16 [2023-11-24 21:59:08,055 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 23 treesize of output 16 [2023-11-24 21:59:08,090 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 23 treesize of output 16 [2023-11-24 21:59:08,104 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 23 treesize of output 16 [2023-11-24 21:59:08,195 INFO L349 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2023-11-24 21:59:08,195 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 31 [2023-11-24 21:59:08,247 INFO L349 Elim1Store]: treesize reduction 38, result has 39.7 percent of original size [2023-11-24 21:59:08,247 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 34 treesize of output 31 [2023-11-24 21:59:10,061 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 102 [2023-11-24 21:59:10,324 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 16 [2023-11-24 21:59:10,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 21:59:10,398 INFO L327 TraceCheckSpWp]: Computing backward predicates...