./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx --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 e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 21:03:28,785 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 21:03:28,916 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-21 21:03:28,926 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 21:03:28,927 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 21:03:28,970 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 21:03:28,971 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 21:03:28,972 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 21:03:28,973 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 21:03:28,978 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 21:03:28,979 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 21:03:28,980 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 21:03:28,980 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 21:03:28,982 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 21:03:28,983 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 21:03:28,983 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 21:03:28,984 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 21:03:28,984 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 21:03:28,985 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-21 21:03:28,985 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-21 21:03:28,986 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-21 21:03:28,986 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 21:03:28,987 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-21 21:03:28,987 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 21:03:28,988 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 21:03:28,988 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 21:03:28,989 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 21:03:28,990 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 21:03:28,990 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 21:03:28,991 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 21:03:28,992 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 21:03:28,993 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 21:03:28,993 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 21:03:28,993 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 21:03:28,994 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 21:03:28,994 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 21:03:28,994 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 21:03:28,994 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 21:03:28,995 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 21:03:28,995 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_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 [2023-11-21 21:03:29,344 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 21:03:29,378 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 21:03:29,381 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 21:03:29,383 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 21:03:29,384 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 21:03:29,385 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-21 21:03:32,732 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 21:03:33,142 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 21:03:33,142 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-21 21:03:33,161 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/data/b52e147d1/a59f88b5331c40a281430749fe430d09/FLAG551973a10 [2023-11-21 21:03:33,183 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/data/b52e147d1/a59f88b5331c40a281430749fe430d09 [2023-11-21 21:03:33,190 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 21:03:33,192 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 21:03:33,196 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 21:03:33,196 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 21:03:33,203 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 21:03:33,204 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,205 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1423d699 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33, skipping insertion in model container [2023-11-21 21:03:33,205 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,276 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 21:03:33,632 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 21:03:33,645 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 21:03:33,747 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 21:03:33,787 INFO L206 MainTranslator]: Completed translation [2023-11-21 21:03:33,788 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33 WrapperNode [2023-11-21 21:03:33,788 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 21:03:33,789 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 21:03:33,790 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 21:03:33,790 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 21:03:33,800 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,819 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,854 INFO L138 Inliner]: procedures = 127, calls = 48, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 146 [2023-11-21 21:03:33,854 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 21:03:33,855 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 21:03:33,856 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 21:03:33,856 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 21:03:33,868 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,874 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,879 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,883 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,911 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,919 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,922 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,924 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,936 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 21:03:33,938 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 21:03:33,938 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 21:03:33,938 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 21:03:33,939 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (1/1) ... [2023-11-21 21:03:33,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 21:03:33,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:33,979 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 21:03:34,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 21:03:34,048 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 21:03:34,049 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 21:03:34,050 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-21 21:03:34,050 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-21 21:03:34,050 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 21:03:34,051 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 21:03:34,052 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 21:03:34,052 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-21 21:03:34,052 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-21 21:03:34,052 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 21:03:34,052 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-21 21:03:34,053 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 21:03:34,053 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 21:03:34,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 21:03:34,241 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 21:03:34,244 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 21:03:34,748 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 21:03:34,809 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 21:03:34,809 INFO L308 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-21 21:03:34,811 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:03:34 BoogieIcfgContainer [2023-11-21 21:03:34,811 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 21:03:34,814 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 21:03:34,814 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 21:03:34,817 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 21:03:34,817 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 09:03:33" (1/3) ... [2023-11-21 21:03:34,818 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1513718e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:03:34, skipping insertion in model container [2023-11-21 21:03:34,818 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:03:33" (2/3) ... [2023-11-21 21:03:34,819 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1513718e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:03:34, skipping insertion in model container [2023-11-21 21:03:34,819 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:03:34" (3/3) ... [2023-11-21 21:03:34,820 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2c_prepend_equal.i [2023-11-21 21:03:34,839 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 21:03:34,840 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2023-11-21 21:03:34,904 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 21:03:34,912 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;@6c5df053, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 21:03:34,912 INFO L358 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2023-11-21 21:03:34,918 INFO L276 IsEmpty]: Start isEmpty. Operand has 120 states, 55 states have (on average 2.290909090909091) internal successors, (126), 115 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:34,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-21 21:03:34,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:34,928 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-21 21:03:34,929 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:34,935 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:34,935 INFO L85 PathProgramCache]: Analyzing trace with hash 234339174, now seen corresponding path program 1 times [2023-11-21 21:03:34,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:34,945 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547898516] [2023-11-21 21:03:34,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:34,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:35,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:35,259 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:35,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547898516] [2023-11-21 21:03:35,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547898516] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:35,260 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:35,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 21:03:35,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647511479] [2023-11-21 21:03:35,264 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:35,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 21:03:35,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:35,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 21:03:35,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 21:03:35,328 INFO L87 Difference]: Start difference. First operand has 120 states, 55 states have (on average 2.290909090909091) internal successors, (126), 115 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-21 21:03:35,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:35,618 INFO L93 Difference]: Finished difference Result 116 states and 125 transitions. [2023-11-21 21:03:35,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 21:03:35,622 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-21 21:03:35,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:35,633 INFO L225 Difference]: With dead ends: 116 [2023-11-21 21:03:35,634 INFO L226 Difference]: Without dead ends: 114 [2023-11-21 21:03:35,637 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 [2023-11-21 21:03:35,644 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 8 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:35,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 160 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:03:35,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-21 21:03:35,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2023-11-21 21:03:35,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 53 states have (on average 2.188679245283019) internal successors, (116), 109 states have internal predecessors, (116), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:35,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2023-11-21 21:03:35,731 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 5 [2023-11-21 21:03:35,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:35,732 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2023-11-21 21:03:35,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-21 21:03:35,732 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2023-11-21 21:03:35,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-21 21:03:35,735 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:35,735 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-21 21:03:35,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 21:03:35,737 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:35,738 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:35,738 INFO L85 PathProgramCache]: Analyzing trace with hash 234339175, now seen corresponding path program 1 times [2023-11-21 21:03:35,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:35,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324743942] [2023-11-21 21:03:35,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:35,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:35,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:35,897 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:35,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324743942] [2023-11-21 21:03:35,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324743942] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:35,898 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:35,898 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 21:03:35,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49576586] [2023-11-21 21:03:35,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:35,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 21:03:35,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:35,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 21:03:35,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 21:03:35,902 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-21 21:03:36,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:36,087 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2023-11-21 21:03:36,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 21:03:36,088 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-21 21:03:36,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:36,096 INFO L225 Difference]: With dead ends: 111 [2023-11-21 21:03:36,096 INFO L226 Difference]: Without dead ends: 111 [2023-11-21 21:03:36,102 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 [2023-11-21 21:03:36,104 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 3 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:36,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 165 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:03:36,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-21 21:03:36,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-21 21:03:36,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 53 states have (on average 2.1320754716981134) internal successors, (113), 106 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:36,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 119 transitions. [2023-11-21 21:03:36,133 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 119 transitions. Word has length 5 [2023-11-21 21:03:36,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:36,134 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 119 transitions. [2023-11-21 21:03:36,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-21 21:03:36,135 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 119 transitions. [2023-11-21 21:03:36,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-21 21:03:36,136 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:36,136 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:36,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 21:03:36,137 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:36,137 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:36,138 INFO L85 PathProgramCache]: Analyzing trace with hash -596227078, now seen corresponding path program 1 times [2023-11-21 21:03:36,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:36,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940896575] [2023-11-21 21:03:36,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:36,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:36,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:36,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:36,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:36,458 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:36,458 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:36,458 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940896575] [2023-11-21 21:03:36,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940896575] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:36,459 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:36,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 21:03:36,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500096079] [2023-11-21 21:03:36,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:36,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 21:03:36,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:36,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 21:03:36,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:03:36,462 INFO L87 Difference]: Start difference. First operand 111 states and 119 transitions. Second operand has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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) [2023-11-21 21:03:36,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:36,912 INFO L93 Difference]: Finished difference Result 115 states and 125 transitions. [2023-11-21 21:03:36,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:36,914 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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 11 [2023-11-21 21:03:36,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:36,924 INFO L225 Difference]: With dead ends: 115 [2023-11-21 21:03:36,925 INFO L226 Difference]: Without dead ends: 115 [2023-11-21 21:03:36,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:36,933 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 7 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:36,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 338 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 21:03:36,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-21 21:03:36,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2023-11-21 21:03:36,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 55 states have (on average 2.1272727272727274) internal successors, (117), 108 states have internal predecessors, (117), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:36,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 123 transitions. [2023-11-21 21:03:36,962 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 123 transitions. Word has length 11 [2023-11-21 21:03:36,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:36,963 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 123 transitions. [2023-11-21 21:03:36,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 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) [2023-11-21 21:03:36,963 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 123 transitions. [2023-11-21 21:03:36,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-21 21:03:36,964 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:36,964 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:36,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 21:03:36,965 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:36,965 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:36,965 INFO L85 PathProgramCache]: Analyzing trace with hash -596227077, now seen corresponding path program 1 times [2023-11-21 21:03:36,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:36,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314230904] [2023-11-21 21:03:36,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:36,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:37,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:37,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:37,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:37,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:37,173 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:37,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314230904] [2023-11-21 21:03:37,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314230904] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:37,174 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:37,174 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 21:03:37,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052335962] [2023-11-21 21:03:37,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:37,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 21:03:37,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:37,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 21:03:37,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 21:03:37,176 INFO L87 Difference]: Start difference. First operand 113 states and 123 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-21 21:03:37,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:37,368 INFO L93 Difference]: Finished difference Result 112 states and 120 transitions. [2023-11-21 21:03:37,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 21:03:37,368 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 11 [2023-11-21 21:03:37,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:37,370 INFO L225 Difference]: With dead ends: 112 [2023-11-21 21:03:37,370 INFO L226 Difference]: Without dead ends: 112 [2023-11-21 21:03:37,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 21:03:37,378 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 10 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:37,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 226 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:03:37,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-11-21 21:03:37,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2023-11-21 21:03:37,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 54 states have (on average 2.111111111111111) internal successors, (114), 107 states have internal predecessors, (114), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:37,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2023-11-21 21:03:37,396 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 11 [2023-11-21 21:03:37,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:37,396 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2023-11-21 21:03:37,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-21 21:03:37,396 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2023-11-21 21:03:37,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 21:03:37,403 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:37,403 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:37,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 21:03:37,404 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:37,405 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:37,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1003078540, now seen corresponding path program 1 times [2023-11-21 21:03:37,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:37,406 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439873165] [2023-11-21 21:03:37,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:37,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:37,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:37,590 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:37,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:37,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:37,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:37,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:03:37,684 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:37,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439873165] [2023-11-21 21:03:37,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439873165] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:37,684 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:37,684 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 21:03:37,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201443846] [2023-11-21 21:03:37,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:37,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 21:03:37,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:37,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 21:03:37,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:03:37,686 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:37,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:37,998 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2023-11-21 21:03:37,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:37,998 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-21 21:03:37,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:37,999 INFO L225 Difference]: With dead ends: 111 [2023-11-21 21:03:37,999 INFO L226 Difference]: Without dead ends: 111 [2023-11-21 21:03:38,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:38,001 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 9 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:38,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 332 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 21:03:38,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-21 21:03:38,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-21 21:03:38,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 106 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:38,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 119 transitions. [2023-11-21 21:03:38,013 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 119 transitions. Word has length 19 [2023-11-21 21:03:38,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:38,013 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 119 transitions. [2023-11-21 21:03:38,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:38,014 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 119 transitions. [2023-11-21 21:03:38,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 21:03:38,015 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:38,015 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:38,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 21:03:38,016 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:38,017 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:38,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1003078539, now seen corresponding path program 1 times [2023-11-21 21:03:38,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:38,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041216482] [2023-11-21 21:03:38,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:38,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:38,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:38,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:38,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:38,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:38,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:38,383 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:38,384 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:38,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041216482] [2023-11-21 21:03:38,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041216482] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:38,384 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:38,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 21:03:38,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609120881] [2023-11-21 21:03:38,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:38,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 21:03:38,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:38,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 21:03:38,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:03:38,386 INFO L87 Difference]: Start difference. First operand 111 states and 119 transitions. Second operand has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:38,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:38,681 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2023-11-21 21:03:38,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:38,681 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-21 21:03:38,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:38,682 INFO L225 Difference]: With dead ends: 110 [2023-11-21 21:03:38,682 INFO L226 Difference]: Without dead ends: 110 [2023-11-21 21:03:38,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:38,683 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 7 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:38,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 356 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 21:03:38,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-11-21 21:03:38,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2023-11-21 21:03:38,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 54 states have (on average 2.074074074074074) internal successors, (112), 105 states have internal predecessors, (112), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:38,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2023-11-21 21:03:38,691 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 19 [2023-11-21 21:03:38,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:38,691 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2023-11-21 21:03:38,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:38,692 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2023-11-21 21:03:38,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 21:03:38,692 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:38,693 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:38,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-21 21:03:38,693 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:38,693 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:38,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1885802923, now seen corresponding path program 1 times [2023-11-21 21:03:38,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:38,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330186851] [2023-11-21 21:03:38,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:38,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:38,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:38,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:38,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:39,035 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:39,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:39,167 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:39,168 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:39,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330186851] [2023-11-21 21:03:39,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330186851] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:39,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590468386] [2023-11-21 21:03:39,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:39,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:39,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:39,172 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:39,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 21:03:39,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:39,360 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-21 21:03:39,368 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:39,445 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 [2023-11-21 21:03:39,527 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-21 21:03:39,592 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 21:03:39,593 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 12 treesize of output 14 [2023-11-21 21:03:39,616 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-21 21:03:39,616 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:03:39,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:39,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590468386] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 21:03:39,897 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 21:03:39,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 6] total 11 [2023-11-21 21:03:39,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710487587] [2023-11-21 21:03:39,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 21:03:39,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 21:03:39,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:39,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 21:03:39,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=84, Unknown=1, NotChecked=18, Total=132 [2023-11-21 21:03:39,899 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-21 21:03:40,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:40,372 INFO L93 Difference]: Finished difference Result 117 states and 127 transitions. [2023-11-21 21:03:40,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:40,373 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 21 [2023-11-21 21:03:40,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:40,374 INFO L225 Difference]: With dead ends: 117 [2023-11-21 21:03:40,374 INFO L226 Difference]: Without dead ends: 117 [2023-11-21 21:03:40,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=116, Unknown=1, NotChecked=22, Total=182 [2023-11-21 21:03:40,375 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 5 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:40,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 387 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 420 Invalid, 0 Unknown, 122 Unchecked, 0.4s Time] [2023-11-21 21:03:40,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-21 21:03:40,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2023-11-21 21:03:40,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 58 states have (on average 2.0344827586206895) internal successors, (118), 109 states have internal predecessors, (118), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-21 21:03:40,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 126 transitions. [2023-11-21 21:03:40,383 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 126 transitions. Word has length 21 [2023-11-21 21:03:40,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:40,384 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 126 transitions. [2023-11-21 21:03:40,384 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-21 21:03:40,384 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 126 transitions. [2023-11-21 21:03:40,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 21:03:40,385 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:40,385 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:40,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:40,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-21 21:03:40,586 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:40,587 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:40,587 INFO L85 PathProgramCache]: Analyzing trace with hash -1885802922, now seen corresponding path program 1 times [2023-11-21 21:03:40,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:40,587 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569041837] [2023-11-21 21:03:40,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:40,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:40,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:40,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:40,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:41,004 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:41,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:41,108 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:41,109 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:41,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569041837] [2023-11-21 21:03:41,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569041837] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:41,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009969697] [2023-11-21 21:03:41,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:41,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:41,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:41,111 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:41,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 21:03:41,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:41,292 INFO L262 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-21 21:03:41,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:41,320 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 [2023-11-21 21:03:41,327 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 8 treesize of output 1 [2023-11-21 21:03:41,634 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 21:03:41,634 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 [2023-11-21 21:03:41,658 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 21:03:41,658 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 21:03:41,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 21:03:41,745 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:03:41,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009969697] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:41,972 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 21:03:41,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2023-11-21 21:03:41,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543226776] [2023-11-21 21:03:41,973 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 21:03:41,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-21 21:03:41,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:41,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-21 21:03:41,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2023-11-21 21:03:41,975 INFO L87 Difference]: Start difference. First operand 115 states and 126 transitions. Second operand has 18 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 21:03:42,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:42,923 INFO L93 Difference]: Finished difference Result 117 states and 127 transitions. [2023-11-21 21:03:42,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 21:03:42,924 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 21 [2023-11-21 21:03:42,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:42,925 INFO L225 Difference]: With dead ends: 117 [2023-11-21 21:03:42,926 INFO L226 Difference]: Without dead ends: 117 [2023-11-21 21:03:42,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2023-11-21 21:03:42,927 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 8 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 943 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 943 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:42,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 681 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 943 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-21 21:03:42,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-21 21:03:42,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2023-11-21 21:03:42,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 58 states have (on average 2.0172413793103448) internal successors, (117), 109 states have internal predecessors, (117), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-21 21:03:42,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 125 transitions. [2023-11-21 21:03:42,938 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 125 transitions. Word has length 21 [2023-11-21 21:03:42,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:42,938 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 125 transitions. [2023-11-21 21:03:42,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 13 states have internal predecessors, (33), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 21:03:42,939 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 125 transitions. [2023-11-21 21:03:42,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 21:03:42,940 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:42,940 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:42,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:43,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:43,156 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:43,157 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:43,157 INFO L85 PathProgramCache]: Analyzing trace with hash 219750646, now seen corresponding path program 1 times [2023-11-21 21:03:43,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:43,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102838826] [2023-11-21 21:03:43,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:43,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:43,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:43,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:43,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:43,361 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:43,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:43,380 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:43,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102838826] [2023-11-21 21:03:43,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102838826] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:43,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930826052] [2023-11-21 21:03:43,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:43,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:43,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:43,383 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:43,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 21:03:43,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:43,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 21:03:43,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:43,568 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 [2023-11-21 21:03:43,657 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-21 21:03:43,687 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 21:03:43,688 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 12 treesize of output 14 [2023-11-21 21:03:43,726 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 5 not checked. [2023-11-21 21:03:43,726 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:03:43,931 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:43,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930826052] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 21:03:43,931 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 21:03:43,932 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 14 [2023-11-21 21:03:43,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652177431] [2023-11-21 21:03:43,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 21:03:43,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 21:03:43,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:43,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 21:03:43,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=131, Unknown=1, NotChecked=22, Total=182 [2023-11-21 21:03:43,935 INFO L87 Difference]: Start difference. First operand 115 states and 125 transitions. Second operand has 14 states, 12 states have (on average 3.5) internal successors, (42), 10 states have internal predecessors, (42), 3 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-21 21:03:44,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:44,347 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2023-11-21 21:03:44,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 21:03:44,347 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.5) internal successors, (42), 10 states have internal predecessors, (42), 3 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 23 [2023-11-21 21:03:44,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:44,348 INFO L225 Difference]: With dead ends: 115 [2023-11-21 21:03:44,348 INFO L226 Difference]: Without dead ends: 115 [2023-11-21 21:03:44,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=226, Unknown=1, NotChecked=30, Total=306 [2023-11-21 21:03:44,349 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 14 mSDsluCounter, 651 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:44,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 741 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 493 Invalid, 0 Unknown, 119 Unchecked, 0.3s Time] [2023-11-21 21:03:44,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2023-11-21 21:03:44,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2023-11-21 21:03:44,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 58 states have (on average 1.9827586206896552) internal successors, (115), 108 states have internal predecessors, (115), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-21 21:03:44,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 123 transitions. [2023-11-21 21:03:44,354 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 123 transitions. Word has length 23 [2023-11-21 21:03:44,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:44,354 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 123 transitions. [2023-11-21 21:03:44,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.5) internal successors, (42), 10 states have internal predecessors, (42), 3 states have call successors, (5), 4 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-21 21:03:44,354 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 123 transitions. [2023-11-21 21:03:44,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-21 21:03:44,355 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:44,355 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:44,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:44,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-21 21:03:44,556 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:44,556 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:44,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1782643318, now seen corresponding path program 1 times [2023-11-21 21:03:44,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:44,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294157855] [2023-11-21 21:03:44,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:44,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:44,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:44,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:44,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:44,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:44,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:44,920 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:44,920 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:44,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294157855] [2023-11-21 21:03:44,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294157855] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:44,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890030503] [2023-11-21 21:03:44,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:44,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:44,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:44,923 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:44,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 21:03:45,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:45,096 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-21 21:03:45,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:45,110 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 8 treesize of output 1 [2023-11-21 21:03:45,117 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 [2023-11-21 21:03:45,269 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-21 21:03:45,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:45,303 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-21 21:03:45,311 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 21:03:45,311 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 21:03:45,353 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-21 21:03:45,353 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:03:45,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890030503] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:45,482 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 21:03:45,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2023-11-21 21:03:45,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973441585] [2023-11-21 21:03:45,483 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 21:03:45,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-21 21:03:45,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:45,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-21 21:03:45,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=230, Unknown=1, NotChecked=30, Total=306 [2023-11-21 21:03:45,485 INFO L87 Difference]: Start difference. First operand 114 states and 123 transitions. Second operand has 16 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 21:03:46,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:46,058 INFO L93 Difference]: Finished difference Result 131 states and 145 transitions. [2023-11-21 21:03:46,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-21 21:03:46,059 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2023-11-21 21:03:46,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:46,060 INFO L225 Difference]: With dead ends: 131 [2023-11-21 21:03:46,060 INFO L226 Difference]: Without dead ends: 131 [2023-11-21 21:03:46,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=350, Unknown=1, NotChecked=38, Total=462 [2023-11-21 21:03:46,062 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 19 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:46,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 588 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 553 Invalid, 0 Unknown, 140 Unchecked, 0.5s Time] [2023-11-21 21:03:46,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-11-21 21:03:46,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 124. [2023-11-21 21:03:46,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 67 states have (on average 1.9253731343283582) internal successors, (129), 117 states have internal predecessors, (129), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 21:03:46,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 139 transitions. [2023-11-21 21:03:46,070 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 139 transitions. Word has length 24 [2023-11-21 21:03:46,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:46,070 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 139 transitions. [2023-11-21 21:03:46,070 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 3 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 21:03:46,071 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 139 transitions. [2023-11-21 21:03:46,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-21 21:03:46,072 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:46,072 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:46,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:46,292 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 21:03:46,293 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:46,293 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:46,293 INFO L85 PathProgramCache]: Analyzing trace with hash 572631964, now seen corresponding path program 1 times [2023-11-21 21:03:46,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:46,294 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449613682] [2023-11-21 21:03:46,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:46,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:46,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:46,492 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:46,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:46,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:46,571 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:03:46,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:46,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449613682] [2023-11-21 21:03:46,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449613682] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:46,572 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:46,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-21 21:03:46,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80240922] [2023-11-21 21:03:46,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:46,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 21:03:46,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:46,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 21:03:46,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:46,575 INFO L87 Difference]: Start difference. First operand 124 states and 139 transitions. Second operand has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:46,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:46,984 INFO L93 Difference]: Finished difference Result 125 states and 140 transitions. [2023-11-21 21:03:46,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 21:03:46,984 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-11-21 21:03:46,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:46,986 INFO L225 Difference]: With dead ends: 125 [2023-11-21 21:03:46,986 INFO L226 Difference]: Without dead ends: 125 [2023-11-21 21:03:46,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-21 21:03:46,987 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 8 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:46,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 379 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 21:03:46,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-21 21:03:46,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2023-11-21 21:03:46,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 67 states have (on average 1.9104477611940298) internal successors, (128), 116 states have internal predecessors, (128), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 21:03:46,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 138 transitions. [2023-11-21 21:03:47,000 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 138 transitions. Word has length 25 [2023-11-21 21:03:47,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:47,000 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 138 transitions. [2023-11-21 21:03:47,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:47,001 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 138 transitions. [2023-11-21 21:03:47,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-21 21:03:47,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:47,006 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:47,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 21:03:47,007 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:47,007 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:47,008 INFO L85 PathProgramCache]: Analyzing trace with hash 572631965, now seen corresponding path program 1 times [2023-11-21 21:03:47,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:47,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571578094] [2023-11-21 21:03:47,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:47,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:47,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:47,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:47,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:47,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:47,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:47,404 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 21:03:47,405 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:47,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571578094] [2023-11-21 21:03:47,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571578094] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:47,406 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:47,406 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-21 21:03:47,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474574386] [2023-11-21 21:03:47,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:47,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 21:03:47,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:47,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 21:03:47,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:47,408 INFO L87 Difference]: Start difference. First operand 123 states and 138 transitions. Second operand has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:47,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:47,840 INFO L93 Difference]: Finished difference Result 122 states and 137 transitions. [2023-11-21 21:03:47,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 21:03:47,840 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 25 [2023-11-21 21:03:47,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:47,842 INFO L225 Difference]: With dead ends: 122 [2023-11-21 21:03:47,842 INFO L226 Difference]: Without dead ends: 122 [2023-11-21 21:03:47,843 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-21 21:03:47,844 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 6 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:47,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 404 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 21:03:47,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-11-21 21:03:47,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2023-11-21 21:03:47,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 67 states have (on average 1.8955223880597014) internal successors, (127), 115 states have internal predecessors, (127), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 21:03:47,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 137 transitions. [2023-11-21 21:03:47,850 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 137 transitions. Word has length 25 [2023-11-21 21:03:47,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:47,851 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 137 transitions. [2023-11-21 21:03:47,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 21:03:47,851 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 137 transitions. [2023-11-21 21:03:47,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-21 21:03:47,853 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:47,853 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:47,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 21:03:47,854 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:47,854 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:47,854 INFO L85 PathProgramCache]: Analyzing trace with hash -235684963, now seen corresponding path program 1 times [2023-11-21 21:03:47,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:47,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826146392] [2023-11-21 21:03:47,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:47,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:47,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:48,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:48,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:48,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:48,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:48,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:48,501 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-21 21:03:48,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:48,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826146392] [2023-11-21 21:03:48,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826146392] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:48,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833787350] [2023-11-21 21:03:48,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:48,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:48,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:48,504 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:48,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 21:03:48,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:48,781 INFO L262 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-21 21:03:48,785 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:48,790 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 [2023-11-21 21:03:48,800 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 5 treesize of output 3 [2023-11-21 21:03:48,872 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 21:03:48,873 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 [2023-11-21 21:03:48,970 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 9 treesize of output 7 [2023-11-21 21:03:48,993 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-21 21:03:49,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:49,044 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 18 treesize of output 13 [2023-11-21 21:03:49,150 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 5 treesize of output 3 [2023-11-21 21:03:49,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:49,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-21 21:03:49,215 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 10 not checked. [2023-11-21 21:03:49,215 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:03:49,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833787350] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:49,305 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 21:03:49,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2023-11-21 21:03:49,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167510067] [2023-11-21 21:03:49,306 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 21:03:49,306 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-21 21:03:49,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:49,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-21 21:03:49,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=223, Unknown=1, NotChecked=30, Total=306 [2023-11-21 21:03:49,308 INFO L87 Difference]: Start difference. First operand 122 states and 137 transitions. Second operand has 17 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 21:03:49,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:49,933 INFO L93 Difference]: Finished difference Result 131 states and 147 transitions. [2023-11-21 21:03:49,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:49,934 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 34 [2023-11-21 21:03:49,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:49,935 INFO L225 Difference]: With dead ends: 131 [2023-11-21 21:03:49,935 INFO L226 Difference]: Without dead ends: 131 [2023-11-21 21:03:49,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=306, Unknown=1, NotChecked=36, Total=420 [2023-11-21 21:03:49,937 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 121 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:49,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 283 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 474 Invalid, 0 Unknown, 119 Unchecked, 0.5s Time] [2023-11-21 21:03:49,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-11-21 21:03:49,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 114. [2023-11-21 21:03:49,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 67 states have (on average 1.7761194029850746) internal successors, (119), 107 states have internal predecessors, (119), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 21:03:49,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 129 transitions. [2023-11-21 21:03:49,942 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 129 transitions. Word has length 34 [2023-11-21 21:03:49,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:49,943 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 129 transitions. [2023-11-21 21:03:49,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 21:03:49,943 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 129 transitions. [2023-11-21 21:03:49,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-21 21:03:49,949 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:49,949 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:49,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:50,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-21 21:03:50,164 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:50,164 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:50,165 INFO L85 PathProgramCache]: Analyzing trace with hash -235684962, now seen corresponding path program 1 times [2023-11-21 21:03:50,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:50,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050500083] [2023-11-21 21:03:50,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:50,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:50,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:50,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:50,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:50,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:50,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:50,939 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:50,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,003 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-21 21:03:51,003 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:51,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050500083] [2023-11-21 21:03:51,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050500083] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:51,004 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:51,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-21 21:03:51,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542423354] [2023-11-21 21:03:51,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:51,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 21:03:51,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:51,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 21:03:51,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-11-21 21:03:51,007 INFO L87 Difference]: Start difference. First operand 114 states and 129 transitions. Second operand has 9 states, 5 states have (on average 3.6) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:51,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:51,357 INFO L93 Difference]: Finished difference Result 123 states and 139 transitions. [2023-11-21 21:03:51,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:51,358 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 5 states have (on average 3.6) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 34 [2023-11-21 21:03:51,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:51,360 INFO L225 Difference]: With dead ends: 123 [2023-11-21 21:03:51,360 INFO L226 Difference]: Without dead ends: 123 [2023-11-21 21:03:51,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-21 21:03:51,361 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 149 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:51,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 113 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 21:03:51,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-11-21 21:03:51,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 106. [2023-11-21 21:03:51,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 67 states have (on average 1.6567164179104477) internal successors, (111), 99 states have internal predecessors, (111), 5 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 21:03:51,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 121 transitions. [2023-11-21 21:03:51,371 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 121 transitions. Word has length 34 [2023-11-21 21:03:51,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:51,372 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 121 transitions. [2023-11-21 21:03:51,372 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 5 states have (on average 3.6) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:51,372 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 121 transitions. [2023-11-21 21:03:51,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-21 21:03:51,374 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:51,374 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:51,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-21 21:03:51,375 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:51,375 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:51,375 INFO L85 PathProgramCache]: Analyzing trace with hash -1077001948, now seen corresponding path program 1 times [2023-11-21 21:03:51,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:51,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458205119] [2023-11-21 21:03:51,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:51,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:51,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:51,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:51,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2023-11-21 21:03:51,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,557 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-21 21:03:51,557 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:51,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458205119] [2023-11-21 21:03:51,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458205119] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:51,558 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:51,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 21:03:51,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760430320] [2023-11-21 21:03:51,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:51,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 21:03:51,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:51,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 21:03:51,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 21:03:51,561 INFO L87 Difference]: Start difference. First operand 106 states and 121 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:03:51,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:51,747 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2023-11-21 21:03:51,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 21:03:51,748 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2023-11-21 21:03:51,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:51,749 INFO L225 Difference]: With dead ends: 88 [2023-11-21 21:03:51,750 INFO L226 Difference]: Without dead ends: 88 [2023-11-21 21:03:51,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 21:03:51,753 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 4 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:51,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 184 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:03:51,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-21 21:03:51,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-11-21 21:03:51,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 54 states have (on average 1.6296296296296295) internal successors, (88), 83 states have internal predecessors, (88), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:51,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2023-11-21 21:03:51,759 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 34 [2023-11-21 21:03:51,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:51,760 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2023-11-21 21:03:51,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:03:51,760 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2023-11-21 21:03:51,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 21:03:51,765 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:51,765 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:51,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-21 21:03:51,768 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:51,769 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:51,769 INFO L85 PathProgramCache]: Analyzing trace with hash 980814136, now seen corresponding path program 1 times [2023-11-21 21:03:51,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:51,770 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372737355] [2023-11-21 21:03:51,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:51,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:51,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:51,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:51,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:51,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:52,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:52,054 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-21 21:03:52,054 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:52,054 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372737355] [2023-11-21 21:03:52,055 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372737355] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:52,055 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:52,055 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 21:03:52,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863911097] [2023-11-21 21:03:52,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:52,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 21:03:52,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:52,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 21:03:52,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:03:52,059 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand has 7 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:03:52,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:52,337 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2023-11-21 21:03:52,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:52,338 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 37 [2023-11-21 21:03:52,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:52,339 INFO L225 Difference]: With dead ends: 84 [2023-11-21 21:03:52,339 INFO L226 Difference]: Without dead ends: 84 [2023-11-21 21:03:52,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:52,340 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 23 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:52,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 229 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 21:03:52,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-21 21:03:52,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-21 21:03:52,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 54 states have (on average 1.5555555555555556) internal successors, (84), 79 states have internal predecessors, (84), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:52,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2023-11-21 21:03:52,346 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 37 [2023-11-21 21:03:52,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:52,348 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2023-11-21 21:03:52,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:03:52,349 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2023-11-21 21:03:52,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 21:03:52,350 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:52,350 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:52,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-21 21:03:52,351 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:52,351 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:52,351 INFO L85 PathProgramCache]: Analyzing trace with hash 980814137, now seen corresponding path program 1 times [2023-11-21 21:03:52,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:52,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350304548] [2023-11-21 21:03:52,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:52,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:52,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:52,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:52,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:52,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:52,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:52,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:52,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:52,684 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-21 21:03:52,685 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:52,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350304548] [2023-11-21 21:03:52,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [350304548] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:52,685 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:03:52,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 21:03:52,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176899879] [2023-11-21 21:03:52,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:52,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 21:03:52,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:52,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 21:03:52,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:03:52,690 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand has 7 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:03:52,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:52,901 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2023-11-21 21:03:52,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:03:52,902 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 37 [2023-11-21 21:03:52,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:52,903 INFO L225 Difference]: With dead ends: 80 [2023-11-21 21:03:52,903 INFO L226 Difference]: Without dead ends: 80 [2023-11-21 21:03:52,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-21 21:03:52,904 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 18 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:52,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 253 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:03:52,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-21 21:03:52,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2023-11-21 21:03:52,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 54 states have (on average 1.4814814814814814) internal successors, (80), 75 states have internal predecessors, (80), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:52,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2023-11-21 21:03:52,907 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 37 [2023-11-21 21:03:52,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:52,908 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2023-11-21 21:03:52,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:03:52,908 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2023-11-21 21:03:52,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 21:03:52,908 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:52,909 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:52,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-21 21:03:52,909 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:52,909 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:52,909 INFO L85 PathProgramCache]: Analyzing trace with hash 980825059, now seen corresponding path program 1 times [2023-11-21 21:03:52,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:52,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987843135] [2023-11-21 21:03:52,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:52,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:52,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:53,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:53,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:53,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:53,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:53,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:53,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:53,938 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 21:03:53,938 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:53,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987843135] [2023-11-21 21:03:53,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987843135] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:53,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770884048] [2023-11-21 21:03:53,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:53,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:53,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:53,940 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:53,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 21:03:54,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:54,507 INFO L262 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 43 conjunts are in the unsatisfiable core [2023-11-21 21:03:54,517 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:54,681 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 9 treesize of output 5 [2023-11-21 21:03:54,837 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1)))) is different from true [2023-11-21 21:03:54,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:54,856 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 18 treesize of output 13 [2023-11-21 21:03:54,873 INFO L349 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2023-11-21 21:03:54,874 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 16 treesize of output 18 [2023-11-21 21:03:54,981 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 17 treesize of output 9 [2023-11-21 21:03:54,996 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 21:03:54,997 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 21:03:54,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770884048] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:03:54,997 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 21:03:54,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [14] total 21 [2023-11-21 21:03:54,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362041186] [2023-11-21 21:03:54,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:03:54,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-21 21:03:54,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:03:54,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-21 21:03:55,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=365, Unknown=1, NotChecked=38, Total=462 [2023-11-21 21:03:55,000 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand has 10 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:03:55,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:03:55,487 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2023-11-21 21:03:55,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 21:03:55,488 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2023-11-21 21:03:55,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:03:55,489 INFO L225 Difference]: With dead ends: 79 [2023-11-21 21:03:55,489 INFO L226 Difference]: Without dead ends: 79 [2023-11-21 21:03:55,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=470, Unknown=1, NotChecked=44, Total=600 [2023-11-21 21:03:55,491 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 76 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 21:03:55,491 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 205 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 289 Invalid, 0 Unknown, 84 Unchecked, 0.3s Time] [2023-11-21 21:03:55,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-21 21:03:55,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-21 21:03:55,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 54 states have (on average 1.462962962962963) internal successors, (79), 74 states have internal predecessors, (79), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:03:55,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2023-11-21 21:03:55,495 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 37 [2023-11-21 21:03:55,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:03:55,495 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2023-11-21 21:03:55,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:03:55,496 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2023-11-21 21:03:55,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 21:03:55,497 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:03:55,497 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:03:55,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 21:03:55,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-21 21:03:55,711 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:03:55,711 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:03:55,711 INFO L85 PathProgramCache]: Analyzing trace with hash 980825060, now seen corresponding path program 1 times [2023-11-21 21:03:55,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:03:55,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759957854] [2023-11-21 21:03:55,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:55,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:03:55,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:56,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:03:56,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:56,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:03:56,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:56,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:03:56,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:57,613 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:03:57,613 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:03:57,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759957854] [2023-11-21 21:03:57,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759957854] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:03:57,614 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819989064] [2023-11-21 21:03:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:03:57,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:03:57,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:03:57,616 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:03:57,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 21:03:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:03:58,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 89 conjunts are in the unsatisfiable core [2023-11-21 21:03:58,171 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:03:58,213 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 [2023-11-21 21:03:58,218 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 [2023-11-21 21:03:58,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:58,662 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2023-11-21 21:03:58,677 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 21:03:58,677 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 21:03:59,254 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 15 [2023-11-21 21:03:59,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-21 21:03:59,528 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-21 21:03:59,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:59,559 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 35 treesize of output 26 [2023-11-21 21:03:59,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:59,584 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 21:03:59,585 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 23 treesize of output 25 [2023-11-21 21:03:59,601 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 21:03:59,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-21 21:03:59,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:03:59,610 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 21:03:59,726 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 17 treesize of output 9 [2023-11-21 21:03:59,732 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 21:03:59,733 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:04:00,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819989064] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:04:00,125 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 21:04:00,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19] total 31 [2023-11-21 21:04:00,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815019402] [2023-11-21 21:04:00,125 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 21:04:00,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-11-21 21:04:00,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:00,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-11-21 21:04:00,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1018, Unknown=1, NotChecked=64, Total=1190 [2023-11-21 21:04:00,128 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 32 states, 23 states have (on average 2.652173913043478) internal successors, (61), 26 states have internal predecessors, (61), 5 states have call successors, (6), 4 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 21:04:02,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:04:02,148 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2023-11-21 21:04:02,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-21 21:04:02,149 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 23 states have (on average 2.652173913043478) internal successors, (61), 26 states have internal predecessors, (61), 5 states have call successors, (6), 4 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 37 [2023-11-21 21:04:02,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:04:02,150 INFO L225 Difference]: With dead ends: 95 [2023-11-21 21:04:02,150 INFO L226 Difference]: Without dead ends: 95 [2023-11-21 21:04:02,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=192, Invalid=1617, Unknown=1, NotChecked=82, Total=1892 [2023-11-21 21:04:02,152 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 157 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 1263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-11-21 21:04:02,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 457 Invalid, 1263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1156 Invalid, 0 Unknown, 101 Unchecked, 1.4s Time] [2023-11-21 21:04:02,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-21 21:04:02,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2023-11-21 21:04:02,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.4444444444444444) internal successors, (78), 73 states have internal predecessors, (78), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:04:02,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2023-11-21 21:04:02,157 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 37 [2023-11-21 21:04:02,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:04:02,157 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2023-11-21 21:04:02,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 23 states have (on average 2.652173913043478) internal successors, (61), 26 states have internal predecessors, (61), 5 states have call successors, (6), 4 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 21:04:02,158 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2023-11-21 21:04:02,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-21 21:04:02,159 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:04:02,159 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:04:02,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-21 21:04:02,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:02,385 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr34REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:04:02,385 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:04:02,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1855259996, now seen corresponding path program 1 times [2023-11-21 21:04:02,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:04:02,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231336707] [2023-11-21 21:04:02,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:02,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:04:02,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:02,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:04:02,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:02,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:04:02,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:02,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:04:03,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:03,243 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:04:03,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:04:03,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231336707] [2023-11-21 21:04:03,243 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231336707] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:04:03,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528769339] [2023-11-21 21:04:03,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:03,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:03,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:04:03,246 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:04:03,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 21:04:03,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:03,593 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-21 21:04:03,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:04:03,699 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 [2023-11-21 21:04:03,843 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-21 21:04:04,106 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 21:04:04,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:04,155 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 16 treesize of output 11 [2023-11-21 21:04:04,174 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-21 21:04:04,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2023-11-21 21:04:04,224 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 26 treesize of output 14 [2023-11-21 21:04:04,254 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 21:04:04,254 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 21:04:04,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528769339] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:04:04,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 21:04:04,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [15] total 27 [2023-11-21 21:04:04,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745650024] [2023-11-21 21:04:04,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:04:04,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-21 21:04:04,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:04,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-21 21:04:04,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-11-21 21:04:04,257 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:04:05,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:04:05,063 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2023-11-21 21:04:05,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-21 21:04:05,063 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2023-11-21 21:04:05,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:04:05,065 INFO L225 Difference]: With dead ends: 100 [2023-11-21 21:04:05,065 INFO L226 Difference]: Without dead ends: 100 [2023-11-21 21:04:05,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2023-11-21 21:04:05,070 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 151 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 21:04:05,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 290 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 21:04:05,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-21 21:04:05,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2023-11-21 21:04:05,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.4363636363636363) internal successors, (79), 73 states have internal predecessors, (79), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:04:05,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2023-11-21 21:04:05,080 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 41 [2023-11-21 21:04:05,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:04:05,080 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2023-11-21 21:04:05,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:04:05,081 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2023-11-21 21:04:05,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-21 21:04:05,081 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:04:05,082 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:04:05,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 21:04:05,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:05,284 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr35REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:04:05,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:04:05,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1855259995, now seen corresponding path program 1 times [2023-11-21 21:04:05,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:04:05,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170443975] [2023-11-21 21:04:05,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:05,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:04:05,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:05,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:04:05,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:05,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:04:05,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:05,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:04:05,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:06,067 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:04:06,067 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:04:06,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170443975] [2023-11-21 21:04:06,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170443975] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:04:06,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752670603] [2023-11-21 21:04:06,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:06,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:06,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:04:06,069 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:04:06,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 21:04:06,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:06,471 INFO L262 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 64 conjunts are in the unsatisfiable core [2023-11-21 21:04:06,476 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:04:06,573 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 8 treesize of output 1 [2023-11-21 21:04:06,729 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-21 21:04:06,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 21:04:06,958 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 21:04:07,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:07,011 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 16 treesize of output 11 [2023-11-21 21:04:07,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:07,025 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 16 treesize of output 11 [2023-11-21 21:04:07,050 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-21 21:04:07,051 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 46 [2023-11-21 21:04:07,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:07,063 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 11 [2023-11-21 21:04:07,125 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 26 treesize of output 14 [2023-11-21 21:04:07,131 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-21 21:04:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 21:04:07,170 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 21:04:07,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752670603] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:04:07,170 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 21:04:07,171 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [15] total 27 [2023-11-21 21:04:07,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48161484] [2023-11-21 21:04:07,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:04:07,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-21 21:04:07,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:07,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-21 21:04:07,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2023-11-21 21:04:07,173 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:04:07,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:04:07,965 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2023-11-21 21:04:07,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-21 21:04:07,966 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2023-11-21 21:04:07,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:04:07,967 INFO L225 Difference]: With dead ends: 84 [2023-11-21 21:04:07,967 INFO L226 Difference]: Without dead ends: 84 [2023-11-21 21:04:07,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=1065, Unknown=0, NotChecked=0, Total=1190 [2023-11-21 21:04:07,969 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 157 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 21:04:07,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 342 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 474 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 21:04:07,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-21 21:04:07,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2023-11-21 21:04:07,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 57 states have (on average 1.4210526315789473) internal successors, (81), 75 states have internal predecessors, (81), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:04:07,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 87 transitions. [2023-11-21 21:04:07,975 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 87 transitions. Word has length 41 [2023-11-21 21:04:07,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:04:07,975 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 87 transitions. [2023-11-21 21:04:07,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 2.5) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-21 21:04:07,976 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 87 transitions. [2023-11-21 21:04:07,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-21 21:04:07,976 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:04:07,976 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:04:08,005 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-21 21:04:08,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:08,192 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr26REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:04:08,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:04:08,193 INFO L85 PathProgramCache]: Analyzing trace with hash -210487412, now seen corresponding path program 1 times [2023-11-21 21:04:08,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:04:08,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307396194] [2023-11-21 21:04:08,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:08,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:04:08,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:04:08,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:04:08,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:04:08,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,391 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-21 21:04:08,391 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:04:08,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307396194] [2023-11-21 21:04:08,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307396194] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:04:08,392 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:04:08,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 21:04:08,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159512224] [2023-11-21 21:04:08,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:04:08,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 21:04:08,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:08,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 21:04:08,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 21:04:08,394 INFO L87 Difference]: Start difference. First operand 80 states and 87 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:04:08,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:04:08,588 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2023-11-21 21:04:08,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:04:08,591 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 41 [2023-11-21 21:04:08,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:04:08,592 INFO L225 Difference]: With dead ends: 79 [2023-11-21 21:04:08,592 INFO L226 Difference]: Without dead ends: 79 [2023-11-21 21:04:08,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:04:08,593 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 6 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:04:08,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 219 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:04:08,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-21 21:04:08,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-21 21:04:08,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 74 states have internal predecessors, (80), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:04:08,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2023-11-21 21:04:08,597 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 41 [2023-11-21 21:04:08,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:04:08,597 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2023-11-21 21:04:08,598 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:04:08,598 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2023-11-21 21:04:08,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-21 21:04:08,598 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:04:08,598 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:04:08,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-11-21 21:04:08,599 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr27REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:04:08,599 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:04:08,599 INFO L85 PathProgramCache]: Analyzing trace with hash -210487411, now seen corresponding path program 1 times [2023-11-21 21:04:08,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:04:08,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721941964] [2023-11-21 21:04:08,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:08,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:04:08,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:04:08,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:04:08,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,857 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:04:08,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:08,866 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-21 21:04:08,866 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:04:08,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721941964] [2023-11-21 21:04:08,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [721941964] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 21:04:08,867 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 21:04:08,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 21:04:08,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131124228] [2023-11-21 21:04:08,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 21:04:08,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 21:04:08,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:08,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 21:04:08,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 21:04:08,869 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:04:09,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 21:04:09,044 INFO L93 Difference]: Finished difference Result 78 states and 85 transitions. [2023-11-21 21:04:09,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 21:04:09,045 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 41 [2023-11-21 21:04:09,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 21:04:09,045 INFO L225 Difference]: With dead ends: 78 [2023-11-21 21:04:09,045 INFO L226 Difference]: Without dead ends: 78 [2023-11-21 21:04:09,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-21 21:04:09,046 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 5 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 21:04:09,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 229 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 21:04:09,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-21 21:04:09,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-11-21 21:04:09,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 57 states have (on average 1.3859649122807018) internal successors, (79), 73 states have internal predecessors, (79), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 21:04:09,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 85 transitions. [2023-11-21 21:04:09,049 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 85 transitions. Word has length 41 [2023-11-21 21:04:09,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 21:04:09,050 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 85 transitions. [2023-11-21 21:04:09,050 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-21 21:04:09,050 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 85 transitions. [2023-11-21 21:04:09,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-21 21:04:09,050 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 21:04:09,051 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 21:04:09,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-11-21 21:04:09,051 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-21 21:04:09,051 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 21:04:09,051 INFO L85 PathProgramCache]: Analyzing trace with hash 2064824870, now seen corresponding path program 1 times [2023-11-21 21:04:09,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 21:04:09,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827447981] [2023-11-21 21:04:09,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:09,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 21:04:09,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:10,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2023-11-21 21:04:10,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:10,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2023-11-21 21:04:10,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:10,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2023-11-21 21:04:10,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:11,570 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 21:04:11,570 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 21:04:11,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827447981] [2023-11-21 21:04:11,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [827447981] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:04:11,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001299766] [2023-11-21 21:04:11,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 21:04:11,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 21:04:11,571 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 21:04:11,572 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 21:04:11,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_03d27960-f336-4eb0-ad4f-9fa3a07b61de/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-21 21:04:11,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 21:04:12,002 INFO L262 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 70 conjunts are in the unsatisfiable core [2023-11-21 21:04:12,007 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 21:04:12,138 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 39 treesize of output 1 [2023-11-21 21:04:12,200 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 21:04:12,200 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 32 [2023-11-21 21:04:12,209 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 18 treesize of output 14 [2023-11-21 21:04:12,225 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-21 21:04:12,225 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 21:04:12,423 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1)))) is different from true [2023-11-21 21:04:12,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:12,452 INFO L349 Elim1Store]: treesize reduction 25, result has 16.7 percent of original size [2023-11-21 21:04:12,452 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 36 [2023-11-21 21:04:12,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 21:04:12,465 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 28 treesize of output 23 [2023-11-21 21:04:12,506 INFO L349 Elim1Store]: treesize reduction 116, result has 32.2 percent of original size [2023-11-21 21:04:12,506 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 40 treesize of output 69 [2023-11-21 21:04:12,668 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 45 treesize of output 33 [2023-11-21 21:04:12,878 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 21:04:12,879 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 39 [2023-11-21 21:04:13,017 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 21:04:13,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 21:04:13,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001299766] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 21:04:13,332 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 21:04:13,332 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13] total 28 [2023-11-21 21:04:13,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652462196] [2023-11-21 21:04:13,335 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 21:04:13,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-21 21:04:13,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 21:04:13,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-21 21:04:13,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=836, Unknown=1, NotChecked=58, Total=992 [2023-11-21 21:04:13,337 INFO L87 Difference]: Start difference. First operand 78 states and 85 transitions. Second operand has 29 states, 23 states have (on average 2.608695652173913) internal successors, (60), 26 states have internal predecessors, (60), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5)