./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 9bd2c7ff 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_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu --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-9bd2c7f [2023-11-19 07:51:05,743 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 07:51:05,815 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-19 07:51:05,821 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 07:51:05,821 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 07:51:05,846 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 07:51:05,846 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 07:51:05,847 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 07:51:05,848 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 07:51:05,848 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 07:51:05,849 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 07:51:05,849 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 07:51:05,850 INFO L153 SettingsManager]: * Use SBE=true [2023-11-19 07:51:05,851 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 07:51:05,851 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 07:51:05,852 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 07:51:05,852 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 07:51:05,853 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 07:51:05,853 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 07:51:05,854 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 07:51:05,854 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 07:51:05,855 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 07:51:05,855 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 07:51:05,856 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 07:51:05,856 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 07:51:05,857 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 07:51:05,857 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 07:51:05,858 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 07:51:05,858 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 07:51:05,859 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:51:05,859 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 07:51:05,860 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 07:51:05,860 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-19 07:51:05,860 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 07:51:05,861 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-19 07:51:05,861 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-19 07:51:05,861 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 07:51:05,862 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-19 07:51:05,862 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_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e0e4fff172a515598d076941b225a1a1f31b97f5ac14127a866784b10a4e3537 [2023-11-19 07:51:06,145 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 07:51:06,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 07:51:06,171 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 07:51:06,172 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 07:51:06,173 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 07:51:06,174 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/../../sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-19 07:51:09,164 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 07:51:09,563 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 07:51:09,564 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/sv-benchmarks/c/list-simple/dll2c_prepend_equal.i [2023-11-19 07:51:09,578 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/data/52a4521ea/0cc5cc327e4f41d18f55ec38bf196971/FLAGf16c3344e [2023-11-19 07:51:09,593 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/data/52a4521ea/0cc5cc327e4f41d18f55ec38bf196971 [2023-11-19 07:51:09,596 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 07:51:09,597 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 07:51:09,599 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 07:51:09,599 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 07:51:09,604 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 07:51:09,605 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:51:09" (1/1) ... [2023-11-19 07:51:09,606 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40bbad09 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:09, skipping insertion in model container [2023-11-19 07:51:09,606 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:51:09" (1/1) ... [2023-11-19 07:51:09,649 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 07:51:10,041 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:51:10,052 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 07:51:10,099 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:51:10,130 INFO L206 MainTranslator]: Completed translation [2023-11-19 07:51:10,131 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10 WrapperNode [2023-11-19 07:51:10,131 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 07:51:10,132 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 07:51:10,133 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 07:51:10,133 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 07:51:10,140 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,155 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,185 INFO L138 Inliner]: procedures = 127, calls = 48, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 146 [2023-11-19 07:51:10,185 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 07:51:10,186 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 07:51:10,186 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 07:51:10,187 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 07:51:10,200 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,201 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,206 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,206 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,218 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,222 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,225 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,227 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,231 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 07:51:10,232 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 07:51:10,232 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 07:51:10,232 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 07:51:10,233 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (1/1) ... [2023-11-19 07:51:10,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:51:10,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:10,277 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 07:51:10,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 07:51:10,312 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 07:51:10,312 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 07:51:10,312 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-19 07:51:10,313 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-19 07:51:10,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 07:51:10,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 07:51:10,313 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 07:51:10,313 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 07:51:10,314 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 07:51:10,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 07:51:10,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 07:51:10,314 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 07:51:10,314 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 07:51:10,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 07:51:10,438 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 07:51:10,440 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 07:51:10,920 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 07:51:10,932 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 07:51:10,936 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 07:51:10,940 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:51:10 BoogieIcfgContainer [2023-11-19 07:51:10,940 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 07:51:10,944 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 07:51:10,944 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 07:51:10,947 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 07:51:10,948 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:51:09" (1/3) ... [2023-11-19 07:51:10,948 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fcde607 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:51:10, skipping insertion in model container [2023-11-19 07:51:10,949 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:10" (2/3) ... [2023-11-19 07:51:10,949 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fcde607 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:51:10, skipping insertion in model container [2023-11-19 07:51:10,949 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:51:10" (3/3) ... [2023-11-19 07:51:10,951 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2c_prepend_equal.i [2023-11-19 07:51:10,969 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 07:51:10,970 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 60 error locations. [2023-11-19 07:51:11,016 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 07:51:11,023 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;@7952030c, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-19 07:51:11,024 INFO L358 AbstractCegarLoop]: Starting to check reachability of 60 error locations. [2023-11-19 07:51:11,037 INFO L276 IsEmpty]: Start isEmpty. Operand has 134 states, 69 states have (on average 2.0579710144927534) internal successors, (142), 129 states have internal predecessors, (142), 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) [2023-11-19 07:51:11,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 07:51:11,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:11,049 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 07:51:11,050 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)] === [2023-11-19 07:51:11,056 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:11,056 INFO L85 PathProgramCache]: Analyzing trace with hash 895580210, now seen corresponding path program 1 times [2023-11-19 07:51:11,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:11,069 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166504523] [2023-11-19 07:51:11,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:11,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:11,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:11,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:51:11,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:11,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166504523] [2023-11-19 07:51:11,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166504523] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:11,310 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:11,310 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 07:51:11,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837686283] [2023-11-19 07:51:11,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:11,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:51:11,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:11,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:51:11,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:51:11,348 INFO L87 Difference]: Start difference. First operand has 134 states, 69 states have (on average 2.0579710144927534) internal successors, (142), 129 states have internal predecessors, (142), 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 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 07:51:11,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:11,557 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2023-11-19 07:51:11,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 07:51:11,560 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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 6 [2023-11-19 07:51:11,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:11,569 INFO L225 Difference]: With dead ends: 130 [2023-11-19 07:51:11,569 INFO L226 Difference]: Without dead ends: 127 [2023-11-19 07:51:11,571 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 [2023-11-19 07:51:11,577 INFO L413 NwaCegarLoop]: 130 mSDtfsCounter, 10 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:11,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 199 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 07:51:11,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-11-19 07:51:11,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2023-11-19 07:51:11,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 66 states have (on average 1.9545454545454546) internal successors, (129), 122 states have internal predecessors, (129), 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) [2023-11-19 07:51:11,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 135 transitions. [2023-11-19 07:51:11,623 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 135 transitions. Word has length 6 [2023-11-19 07:51:11,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:11,623 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 135 transitions. [2023-11-19 07:51:11,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 07:51:11,623 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 135 transitions. [2023-11-19 07:51:11,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 07:51:11,624 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:11,624 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 07:51:11,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 07:51:11,625 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)] === [2023-11-19 07:51:11,625 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:11,648 INFO L85 PathProgramCache]: Analyzing trace with hash 895580211, now seen corresponding path program 1 times [2023-11-19 07:51:11,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:11,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544787976] [2023-11-19 07:51:11,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:11,649 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:11,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:11,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:51:11,857 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:11,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544787976] [2023-11-19 07:51:11,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544787976] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:11,858 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:11,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 07:51:11,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488256808] [2023-11-19 07:51:11,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:11,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:51:11,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:11,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:51:11,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:51:11,861 INFO L87 Difference]: Start difference. First operand 127 states and 135 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 07:51:11,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:11,964 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2023-11-19 07:51:11,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 07:51:11,965 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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 6 [2023-11-19 07:51:11,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:11,967 INFO L225 Difference]: With dead ends: 124 [2023-11-19 07:51:11,967 INFO L226 Difference]: Without dead ends: 124 [2023-11-19 07:51:11,967 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 [2023-11-19 07:51:11,969 INFO L413 NwaCegarLoop]: 127 mSDtfsCounter, 5 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:11,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 201 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:51:11,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-19 07:51:11,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2023-11-19 07:51:11,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 66 states have (on average 1.9090909090909092) internal successors, (126), 119 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) [2023-11-19 07:51:11,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2023-11-19 07:51:11,982 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 6 [2023-11-19 07:51:11,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:11,983 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2023-11-19 07:51:11,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2023-11-19 07:51:11,983 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2023-11-19 07:51:11,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 07:51:11,984 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:11,984 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:11,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 07:51:11,984 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)] === [2023-11-19 07:51:11,985 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:11,985 INFO L85 PathProgramCache]: Analyzing trace with hash -2012688925, now seen corresponding path program 1 times [2023-11-19 07:51:11,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:11,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554676208] [2023-11-19 07:51:11,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:11,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:12,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:12,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:12,118 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:51:12,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:12,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554676208] [2023-11-19 07:51:12,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554676208] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:12,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:12,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 07:51:12,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230106826] [2023-11-19 07:51:12,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:12,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 07:51:12,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:12,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 07:51:12,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 07:51:12,122 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 07:51:12,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:12,268 INFO L93 Difference]: Finished difference Result 135 states and 145 transitions. [2023-11-19 07:51:12,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 07:51:12,269 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-19 07:51:12,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:12,270 INFO L225 Difference]: With dead ends: 135 [2023-11-19 07:51:12,271 INFO L226 Difference]: Without dead ends: 135 [2023-11-19 07:51:12,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 07:51:12,273 INFO L413 NwaCegarLoop]: 129 mSDtfsCounter, 10 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:12,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 298 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:51:12,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-19 07:51:12,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 125. [2023-11-19 07:51:12,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 67 states have (on average 1.8955223880597014) internal successors, (127), 120 states have internal predecessors, (127), 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) [2023-11-19 07:51:12,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 133 transitions. [2023-11-19 07:51:12,287 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 133 transitions. Word has length 14 [2023-11-19 07:51:12,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:12,288 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 133 transitions. [2023-11-19 07:51:12,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 07:51:12,288 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 133 transitions. [2023-11-19 07:51:12,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 07:51:12,289 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:12,289 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:12,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 07:51:12,290 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:12,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:12,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1796020736, now seen corresponding path program 1 times [2023-11-19 07:51:12,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:12,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801800254] [2023-11-19 07:51:12,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:12,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:12,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:12,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:12,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:12,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:12,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:12,548 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 07:51:12,549 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:12,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801800254] [2023-11-19 07:51:12,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801800254] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:12,550 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:12,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 07:51:12,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783313483] [2023-11-19 07:51:12,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:12,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:51:12,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:12,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:51:12,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:51:12,555 INFO L87 Difference]: Start difference. First operand 125 states and 133 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2023-11-19 07:51:12,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:12,907 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2023-11-19 07:51:12,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:12,908 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 24 [2023-11-19 07:51:12,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:12,911 INFO L225 Difference]: With dead ends: 124 [2023-11-19 07:51:12,911 INFO L226 Difference]: Without dead ends: 124 [2023-11-19 07:51:12,912 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 [2023-11-19 07:51:12,918 INFO L413 NwaCegarLoop]: 119 mSDtfsCounter, 10 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:12,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 416 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 07:51:12,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-19 07:51:12,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2023-11-19 07:51:12,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 67 states have (on average 1.8805970149253732) internal successors, (126), 119 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) [2023-11-19 07:51:12,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2023-11-19 07:51:12,944 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 24 [2023-11-19 07:51:12,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:12,945 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2023-11-19 07:51:12,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2023-11-19 07:51:12,945 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2023-11-19 07:51:12,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 07:51:12,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:12,947 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:12,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 07:51:12,948 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:12,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:12,948 INFO L85 PathProgramCache]: Analyzing trace with hash 1796020737, now seen corresponding path program 1 times [2023-11-19 07:51:12,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:12,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889982210] [2023-11-19 07:51:12,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:12,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:12,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:13,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:13,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:13,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:13,367 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:13,367 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:13,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889982210] [2023-11-19 07:51:13,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889982210] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:13,368 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:13,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 07:51:13,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460918787] [2023-11-19 07:51:13,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:13,371 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 07:51:13,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:13,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 07:51:13,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:51:13,372 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2023-11-19 07:51:13,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:13,662 INFO L93 Difference]: Finished difference Result 123 states and 131 transitions. [2023-11-19 07:51:13,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:13,663 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 24 [2023-11-19 07:51:13,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:13,664 INFO L225 Difference]: With dead ends: 123 [2023-11-19 07:51:13,664 INFO L226 Difference]: Without dead ends: 123 [2023-11-19 07:51:13,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-11-19 07:51:13,666 INFO L413 NwaCegarLoop]: 119 mSDtfsCounter, 13 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:13,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 487 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 07:51:13,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-11-19 07:51:13,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2023-11-19 07:51:13,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 67 states have (on average 1.8656716417910448) internal successors, (125), 118 states have internal predecessors, (125), 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) [2023-11-19 07:51:13,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2023-11-19 07:51:13,676 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 24 [2023-11-19 07:51:13,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:13,677 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2023-11-19 07:51:13,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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) [2023-11-19 07:51:13,677 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2023-11-19 07:51:13,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 07:51:13,678 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:13,678 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:13,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 07:51:13,679 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:13,679 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:13,679 INFO L85 PathProgramCache]: Analyzing trace with hash -600925983, now seen corresponding path program 1 times [2023-11-19 07:51:13,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:13,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17989599] [2023-11-19 07:51:13,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:13,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:13,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:13,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:13,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:14,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:14,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:14,149 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:14,150 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:14,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17989599] [2023-11-19 07:51:14,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17989599] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:14,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690046792] [2023-11-19 07:51:14,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:14,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:14,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:14,153 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:14,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 07:51:14,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:14,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 07:51:14,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:14,405 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 [2023-11-19 07:51:14,478 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-19 07:51:14,587 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-19 07:51:14,588 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-19 07:51:14,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2023-11-19 07:51:14,603 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:14,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690046792] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:14,678 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:14,678 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2023-11-19 07:51:14,678 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279495622] [2023-11-19 07:51:14,678 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:14,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 07:51:14,679 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:14,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 07:51:14,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=87, Unknown=1, NotChecked=18, Total=132 [2023-11-19 07:51:14,680 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 07:51:15,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:15,130 INFO L93 Difference]: Finished difference Result 130 states and 140 transitions. [2023-11-19 07:51:15,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:15,130 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2023-11-19 07:51:15,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:15,132 INFO L225 Difference]: With dead ends: 130 [2023-11-19 07:51:15,132 INFO L226 Difference]: Without dead ends: 130 [2023-11-19 07:51:15,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=121, Unknown=1, NotChecked=22, Total=182 [2023-11-19 07:51:15,136 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 8 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:15,136 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 536 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 470 Invalid, 0 Unknown, 133 Unchecked, 0.4s Time] [2023-11-19 07:51:15,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-19 07:51:15,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2023-11-19 07:51:15,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 71 states have (on average 1.8450704225352113) internal successors, (131), 122 states have internal predecessors, (131), 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) [2023-11-19 07:51:15,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 139 transitions. [2023-11-19 07:51:15,159 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 139 transitions. Word has length 26 [2023-11-19 07:51:15,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:15,160 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 139 transitions. [2023-11-19 07:51:15,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 8 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 07:51:15,160 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 139 transitions. [2023-11-19 07:51:15,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-19 07:51:15,162 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:15,162 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:15,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:15,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 07:51:15,377 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:15,377 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:15,377 INFO L85 PathProgramCache]: Analyzing trace with hash -600925982, now seen corresponding path program 1 times [2023-11-19 07:51:15,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:15,378 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024459799] [2023-11-19 07:51:15,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:15,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:15,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:15,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:15,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:15,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:15,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:16,036 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:16,038 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:16,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024459799] [2023-11-19 07:51:16,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024459799] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:16,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7353104] [2023-11-19 07:51:16,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:16,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:16,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:16,041 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:16,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 07:51:16,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:16,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 07:51:16,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:16,230 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 [2023-11-19 07:51:16,235 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 [2023-11-19 07:51:16,424 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 [2023-11-19 07:51:16,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:16,494 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 [2023-11-19 07:51:16,502 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 07:51:16,503 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 [2023-11-19 07:51:16,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2023-11-19 07:51:16,537 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:16,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7353104] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:16,689 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:16,690 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 17 [2023-11-19 07:51:16,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485493253] [2023-11-19 07:51:16,690 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:16,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 07:51:16,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:16,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 07:51:16,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=289, Unknown=1, NotChecked=34, Total=380 [2023-11-19 07:51:16,692 INFO L87 Difference]: Start difference. First operand 128 states and 139 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 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) [2023-11-19 07:51:17,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:17,405 INFO L93 Difference]: Finished difference Result 130 states and 140 transitions. [2023-11-19 07:51:17,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 07:51:17,406 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 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 26 [2023-11-19 07:51:17,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:17,407 INFO L225 Difference]: With dead ends: 130 [2023-11-19 07:51:17,407 INFO L226 Difference]: Without dead ends: 130 [2023-11-19 07:51:17,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=350, Unknown=1, NotChecked=38, Total=462 [2023-11-19 07:51:17,408 INFO L413 NwaCegarLoop]: 119 mSDtfsCounter, 8 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 845 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:17,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 684 Invalid, 985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 845 Invalid, 0 Unknown, 133 Unchecked, 0.6s Time] [2023-11-19 07:51:17,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-19 07:51:17,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2023-11-19 07:51:17,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 71 states have (on average 1.8309859154929577) internal successors, (130), 122 states have internal predecessors, (130), 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) [2023-11-19 07:51:17,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2023-11-19 07:51:17,414 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 26 [2023-11-19 07:51:17,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:17,414 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2023-11-19 07:51:17,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 14 states have internal predecessors, (42), 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) [2023-11-19 07:51:17,415 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2023-11-19 07:51:17,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 07:51:17,415 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:17,416 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:17,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:17,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 07:51:17,635 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:17,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:17,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1964097865, now seen corresponding path program 1 times [2023-11-19 07:51:17,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:17,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355299584] [2023-11-19 07:51:17,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:17,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:17,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:17,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:17,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:17,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:17,854 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:17,856 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:17,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355299584] [2023-11-19 07:51:17,856 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355299584] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:17,856 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005574816] [2023-11-19 07:51:17,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:17,857 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:17,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:17,861 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:17,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 07:51:18,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:18,007 INFO L262 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 07:51:18,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:18,041 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:18,041 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:18,088 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:18,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005574816] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:51:18,089 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 07:51:18,089 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 7 [2023-11-19 07:51:18,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966543863] [2023-11-19 07:51:18,089 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:18,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:51:18,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:18,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:51:18,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:51:18,091 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 07:51:18,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:18,245 INFO L93 Difference]: Finished difference Result 129 states and 138 transitions. [2023-11-19 07:51:18,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:18,246 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-19 07:51:18,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:18,249 INFO L225 Difference]: With dead ends: 129 [2023-11-19 07:51:18,249 INFO L226 Difference]: Without dead ends: 129 [2023-11-19 07:51:18,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:51:18,251 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 4 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 627 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:18,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 627 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:51:18,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-19 07:51:18,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2023-11-19 07:51:18,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 71 states have (on average 1.8169014084507042) internal successors, (129), 122 states have internal predecessors, (129), 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) [2023-11-19 07:51:18,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2023-11-19 07:51:18,258 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 28 [2023-11-19 07:51:18,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:18,258 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2023-11-19 07:51:18,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 07:51:18,259 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2023-11-19 07:51:18,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-19 07:51:18,262 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:18,262 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:18,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:18,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 07:51:18,478 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)] === [2023-11-19 07:51:18,478 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:18,478 INFO L85 PathProgramCache]: Analyzing trace with hash -762272334, now seen corresponding path program 1 times [2023-11-19 07:51:18,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:18,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124692816] [2023-11-19 07:51:18,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:18,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:18,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:18,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:18,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:18,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:18,622 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 07:51:18,622 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:18,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124692816] [2023-11-19 07:51:18,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2124692816] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:18,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258737906] [2023-11-19 07:51:18,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:18,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:18,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:18,624 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:18,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 07:51:18,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:18,787 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 07:51:18,790 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:18,793 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 [2023-11-19 07:51:18,858 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-19 07:51:18,909 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-19 07:51:18,909 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-19 07:51:18,921 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 7 not checked. [2023-11-19 07:51:18,922 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:18,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258737906] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:18,980 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:18,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2023-11-19 07:51:18,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433689703] [2023-11-19 07:51:18,980 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:18,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 07:51:18,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:18,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 07:51:18,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=89, Unknown=1, NotChecked=18, Total=132 [2023-11-19 07:51:18,982 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand has 11 states, 10 states have (on average 3.8) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 07:51:19,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:19,340 INFO L93 Difference]: Finished difference Result 129 states and 138 transitions. [2023-11-19 07:51:19,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 07:51:19,341 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.8) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 29 [2023-11-19 07:51:19,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:19,342 INFO L225 Difference]: With dead ends: 129 [2023-11-19 07:51:19,342 INFO L226 Difference]: Without dead ends: 129 [2023-11-19 07:51:19,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=169, Unknown=1, NotChecked=26, Total=240 [2023-11-19 07:51:19,343 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 17 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:19,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 472 Invalid, 536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 399 Invalid, 0 Unknown, 131 Unchecked, 0.3s Time] [2023-11-19 07:51:19,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-19 07:51:19,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2023-11-19 07:51:19,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 71 states have (on average 1.8028169014084507) internal successors, (128), 121 states have internal predecessors, (128), 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) [2023-11-19 07:51:19,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 136 transitions. [2023-11-19 07:51:19,349 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 136 transitions. Word has length 29 [2023-11-19 07:51:19,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:19,349 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 136 transitions. [2023-11-19 07:51:19,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.8) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 07:51:19,350 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 136 transitions. [2023-11-19 07:51:19,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-19 07:51:19,351 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:19,351 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:19,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:19,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:19,572 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)] === [2023-11-19 07:51:19,573 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:19,573 INFO L85 PathProgramCache]: Analyzing trace with hash -762272333, now seen corresponding path program 1 times [2023-11-19 07:51:19,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:19,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381460250] [2023-11-19 07:51:19,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:19,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:19,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:19,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:19,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:19,867 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:19,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:19,889 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:19,889 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:19,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381460250] [2023-11-19 07:51:19,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [381460250] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:19,890 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051508670] [2023-11-19 07:51:19,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:19,890 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:19,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:19,892 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:19,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 07:51:20,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:20,047 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-19 07:51:20,050 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:20,058 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 [2023-11-19 07:51:20,066 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 [2023-11-19 07:51:20,211 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 [2023-11-19 07:51:20,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:20,263 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 [2023-11-19 07:51:20,274 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 07:51:20,275 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 [2023-11-19 07:51:20,312 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2023-11-19 07:51:20,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:20,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051508670] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:20,446 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:20,446 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2023-11-19 07:51:20,446 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538166598] [2023-11-19 07:51:20,446 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:20,447 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 07:51:20,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:20,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 07:51:20,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=230, Unknown=1, NotChecked=30, Total=306 [2023-11-19 07:51:20,448 INFO L87 Difference]: Start difference. First operand 127 states and 136 transitions. Second operand has 16 states, 15 states have (on average 3.2) internal successors, (48), 12 states have internal predecessors, (48), 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) [2023-11-19 07:51:20,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:20,908 INFO L93 Difference]: Finished difference Result 146 states and 160 transitions. [2023-11-19 07:51:20,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 07:51:20,909 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.2) internal successors, (48), 12 states have internal predecessors, (48), 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 29 [2023-11-19 07:51:20,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:20,912 INFO L225 Difference]: With dead ends: 146 [2023-11-19 07:51:20,912 INFO L226 Difference]: Without dead ends: 146 [2023-11-19 07:51:20,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=350, Unknown=1, NotChecked=38, Total=462 [2023-11-19 07:51:20,913 INFO L413 NwaCegarLoop]: 113 mSDtfsCounter, 36 mSDsluCounter, 596 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 709 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:20,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 709 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 443 Invalid, 0 Unknown, 153 Unchecked, 0.4s Time] [2023-11-19 07:51:20,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-19 07:51:20,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 137. [2023-11-19 07:51:20,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 80 states have (on average 1.775) internal successors, (142), 130 states have internal predecessors, (142), 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) [2023-11-19 07:51:20,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 152 transitions. [2023-11-19 07:51:20,920 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 152 transitions. Word has length 29 [2023-11-19 07:51:20,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:20,922 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 152 transitions. [2023-11-19 07:51:20,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.2) internal successors, (48), 12 states have internal predecessors, (48), 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) [2023-11-19 07:51:20,922 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 152 transitions. [2023-11-19 07:51:20,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-19 07:51:20,938 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:20,939 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:20,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:21,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 07:51:21,161 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)] === [2023-11-19 07:51:21,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:21,162 INFO L85 PathProgramCache]: Analyzing trace with hash 2139361427, now seen corresponding path program 1 times [2023-11-19 07:51:21,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:21,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809350552] [2023-11-19 07:51:21,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:21,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:21,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:21,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:21,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,340 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 07:51:21,340 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:21,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809350552] [2023-11-19 07:51:21,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809350552] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:21,340 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:21,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 07:51:21,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468857095] [2023-11-19 07:51:21,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:21,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 07:51:21,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:21,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 07:51:21,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:51:21,345 INFO L87 Difference]: Start difference. First operand 137 states and 152 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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) [2023-11-19 07:51:21,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:21,643 INFO L93 Difference]: Finished difference Result 138 states and 153 transitions. [2023-11-19 07:51:21,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 07:51:21,643 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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 30 [2023-11-19 07:51:21,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:21,645 INFO L225 Difference]: With dead ends: 138 [2023-11-19 07:51:21,645 INFO L226 Difference]: Without dead ends: 138 [2023-11-19 07:51:21,645 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-19 07:51:21,646 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 11 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:21,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 466 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 07:51:21,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-19 07:51:21,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2023-11-19 07:51:21,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 80 states have (on average 1.7625) internal successors, (141), 129 states have internal predecessors, (141), 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) [2023-11-19 07:51:21,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 151 transitions. [2023-11-19 07:51:21,651 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 151 transitions. Word has length 30 [2023-11-19 07:51:21,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:21,651 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 151 transitions. [2023-11-19 07:51:21,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 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) [2023-11-19 07:51:21,651 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 151 transitions. [2023-11-19 07:51:21,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-19 07:51:21,652 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:21,652 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:21,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-19 07:51:21,653 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)] === [2023-11-19 07:51:21,653 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:21,653 INFO L85 PathProgramCache]: Analyzing trace with hash 2139361428, now seen corresponding path program 1 times [2023-11-19 07:51:21,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:21,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083342271] [2023-11-19 07:51:21,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:21,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:21,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:21,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:21,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:21,961 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:21,961 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:21,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083342271] [2023-11-19 07:51:21,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083342271] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:21,962 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:21,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 07:51:21,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719968605] [2023-11-19 07:51:21,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:21,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 07:51:21,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:21,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 07:51:21,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:51:21,965 INFO L87 Difference]: Start difference. First operand 136 states and 151 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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) [2023-11-19 07:51:22,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:22,263 INFO L93 Difference]: Finished difference Result 135 states and 150 transitions. [2023-11-19 07:51:22,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 07:51:22,263 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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 30 [2023-11-19 07:51:22,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:22,264 INFO L225 Difference]: With dead ends: 135 [2023-11-19 07:51:22,264 INFO L226 Difference]: Without dead ends: 135 [2023-11-19 07:51:22,265 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 [2023-11-19 07:51:22,265 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 9 mSDsluCounter, 376 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:22,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 491 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 07:51:22,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-19 07:51:22,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2023-11-19 07:51:22,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 80 states have (on average 1.75) internal successors, (140), 128 states have internal predecessors, (140), 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) [2023-11-19 07:51:22,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 150 transitions. [2023-11-19 07:51:22,270 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 150 transitions. Word has length 30 [2023-11-19 07:51:22,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:22,270 INFO L495 AbstractCegarLoop]: Abstraction has 135 states and 150 transitions. [2023-11-19 07:51:22,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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) [2023-11-19 07:51:22,270 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 150 transitions. [2023-11-19 07:51:22,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-19 07:51:22,271 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:22,271 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:51:22,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-19 07:51:22,272 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:22,272 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:22,272 INFO L85 PathProgramCache]: Analyzing trace with hash 2057187888, now seen corresponding path program 1 times [2023-11-19 07:51:22,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:22,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743504106] [2023-11-19 07:51:22,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:22,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:22,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:22,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:22,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:22,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:22,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:22,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2023-11-19 07:51:22,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:22,470 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-19 07:51:22,470 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:22,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743504106] [2023-11-19 07:51:22,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1743504106] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:22,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301939794] [2023-11-19 07:51:22,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:22,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:22,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:22,473 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:22,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 07:51:22,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:22,668 INFO L262 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 07:51:22,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:22,703 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 07:51:22,703 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:51:22,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301939794] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:22,704 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:51:22,704 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2023-11-19 07:51:22,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236023104] [2023-11-19 07:51:22,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:22,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 07:51:22,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:22,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 07:51:22,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 07:51:22,706 INFO L87 Difference]: Start difference. First operand 135 states and 150 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 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) [2023-11-19 07:51:22,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:22,721 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2023-11-19 07:51:22,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 07:51:22,721 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 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 [2023-11-19 07:51:22,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:22,722 INFO L225 Difference]: With dead ends: 117 [2023-11-19 07:51:22,723 INFO L226 Difference]: Without dead ends: 117 [2023-11-19 07:51:22,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 07:51:22,724 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 4 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:22,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 341 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:51:22,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-19 07:51:22,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2023-11-19 07:51:22,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 67 states have (on average 1.7462686567164178) internal successors, (117), 112 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) [2023-11-19 07:51:22,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2023-11-19 07:51:22,729 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 41 [2023-11-19 07:51:22,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:22,729 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2023-11-19 07:51:22,729 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 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) [2023-11-19 07:51:22,729 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2023-11-19 07:51:22,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 07:51:22,732 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:22,732 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:22,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:22,953 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-19 07:51:22,953 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:22,954 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:22,954 INFO L85 PathProgramCache]: Analyzing trace with hash -1908476144, now seen corresponding path program 1 times [2023-11-19 07:51:22,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:22,954 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250024955] [2023-11-19 07:51:22,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:22,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:22,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:23,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:23,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:23,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:23,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:23,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:23,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:23,513 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 07:51:23,514 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:23,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250024955] [2023-11-19 07:51:23,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250024955] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:23,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108818933] [2023-11-19 07:51:23,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:23,514 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:23,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:23,516 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:23,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 07:51:23,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:23,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 07:51:23,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:23,763 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 [2023-11-19 07:51:23,784 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 [2023-11-19 07:51:23,803 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 [2023-11-19 07:51:23,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:23,856 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 [2023-11-19 07:51:23,872 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 [2023-11-19 07:51:23,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:23,930 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 [2023-11-19 07:51:23,959 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 [2023-11-19 07:51:23,999 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 07:51:23,999 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 [2023-11-19 07:51:24,008 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 14 not checked. [2023-11-19 07:51:24,009 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:24,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108818933] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:24,197 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:24,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 12 [2023-11-19 07:51:24,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585936637] [2023-11-19 07:51:24,197 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:24,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 07:51:24,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:24,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 07:51:24,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=121, Unknown=2, NotChecked=46, Total=210 [2023-11-19 07:51:24,198 INFO L87 Difference]: Start difference. First operand 117 states and 123 transitions. Second operand has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 07:51:24,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:24,588 INFO L93 Difference]: Finished difference Result 127 states and 134 transitions. [2023-11-19 07:51:24,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 07:51:24,588 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2023-11-19 07:51:24,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:24,589 INFO L225 Difference]: With dead ends: 127 [2023-11-19 07:51:24,589 INFO L226 Difference]: Without dead ends: 127 [2023-11-19 07:51:24,590 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=162, Unknown=2, NotChecked=54, Total=272 [2023-11-19 07:51:24,590 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 134 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 254 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:24,591 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 299 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 387 Invalid, 0 Unknown, 254 Unchecked, 0.3s Time] [2023-11-19 07:51:24,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-11-19 07:51:24,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 109. [2023-11-19 07:51:24,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 67 states have (on average 1.626865671641791) internal successors, (109), 104 states have internal predecessors, (109), 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) [2023-11-19 07:51:24,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 115 transitions. [2023-11-19 07:51:24,595 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 115 transitions. Word has length 43 [2023-11-19 07:51:24,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:24,595 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 115 transitions. [2023-11-19 07:51:24,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 11 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 07:51:24,595 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 115 transitions. [2023-11-19 07:51:24,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 07:51:24,596 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:24,596 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:24,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:24,796 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-19 07:51:24,797 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 57 more)] === [2023-11-19 07:51:24,797 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:24,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1908476143, now seen corresponding path program 1 times [2023-11-19 07:51:24,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:24,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325741456] [2023-11-19 07:51:24,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:24,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:24,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:25,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:25,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:25,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:25,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:25,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:25,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:25,759 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 07:51:25,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:25,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325741456] [2023-11-19 07:51:25,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325741456] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:25,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426017428] [2023-11-19 07:51:25,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:25,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:25,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:25,762 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:25,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 07:51:26,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:26,012 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-19 07:51:26,021 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:26,031 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 [2023-11-19 07:51:26,055 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 [2023-11-19 07:51:26,073 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|))) is different from true [2023-11-19 07:51:26,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:26,125 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 [2023-11-19 07:51:26,147 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 [2023-11-19 07:51:26,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:26,192 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 [2023-11-19 07:51:26,277 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 [2023-11-19 07:51:26,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:26,325 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 [2023-11-19 07:51:26,333 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-19 07:51:26,333 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:51:26,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426017428] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:26,333 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:51:26,333 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [11] total 15 [2023-11-19 07:51:26,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081086812] [2023-11-19 07:51:26,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:26,334 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:51:26,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:26,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:51:26,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=169, Unknown=1, NotChecked=26, Total=240 [2023-11-19 07:51:26,335 INFO L87 Difference]: Start difference. First operand 109 states and 115 transitions. Second operand has 7 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 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) [2023-11-19 07:51:26,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:26,511 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2023-11-19 07:51:26,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:26,511 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 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 43 [2023-11-19 07:51:26,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:26,512 INFO L225 Difference]: With dead ends: 104 [2023-11-19 07:51:26,512 INFO L226 Difference]: Without dead ends: 104 [2023-11-19 07:51:26,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=193, Unknown=1, NotChecked=28, Total=272 [2023-11-19 07:51:26,513 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 32 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:26,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 276 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 182 Invalid, 0 Unknown, 142 Unchecked, 0.1s Time] [2023-11-19 07:51:26,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-11-19 07:51:26,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2023-11-19 07:51:26,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 67 states have (on average 1.5522388059701493) internal successors, (104), 99 states have internal predecessors, (104), 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) [2023-11-19 07:51:26,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 110 transitions. [2023-11-19 07:51:26,517 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 110 transitions. Word has length 43 [2023-11-19 07:51:26,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:26,517 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 110 transitions. [2023-11-19 07:51:26,517 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 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) [2023-11-19 07:51:26,518 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 110 transitions. [2023-11-19 07:51:26,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 07:51:26,518 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:26,518 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:26,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:26,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-19 07:51:26,719 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)] === [2023-11-19 07:51:26,719 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:26,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1364276453, now seen corresponding path program 1 times [2023-11-19 07:51:26,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:26,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831555571] [2023-11-19 07:51:26,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:26,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:26,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:26,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:26,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:26,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:26,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:26,983 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 07:51:26,983 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:26,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831555571] [2023-11-19 07:51:26,984 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831555571] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:26,984 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:26,984 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 07:51:26,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915300835] [2023-11-19 07:51:26,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:26,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:51:26,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:26,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:51:26,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:51:26,987 INFO L87 Difference]: Start difference. First operand 104 states and 110 transitions. Second operand has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 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) [2023-11-19 07:51:27,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:27,201 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2023-11-19 07:51:27,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:27,202 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 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 46 [2023-11-19 07:51:27,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:27,203 INFO L225 Difference]: With dead ends: 100 [2023-11-19 07:51:27,203 INFO L226 Difference]: Without dead ends: 100 [2023-11-19 07:51:27,203 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 [2023-11-19 07:51:27,204 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 27 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:27,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 322 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 07:51:27,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-11-19 07:51:27,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-11-19 07:51:27,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 67 states have (on average 1.492537313432836) internal successors, (100), 95 states have internal predecessors, (100), 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) [2023-11-19 07:51:27,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2023-11-19 07:51:27,209 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 46 [2023-11-19 07:51:27,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:27,210 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2023-11-19 07:51:27,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.166666666666667) internal successors, (31), 5 states have internal predecessors, (31), 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) [2023-11-19 07:51:27,210 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2023-11-19 07:51:27,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 07:51:27,211 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:27,212 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:27,212 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-19 07:51:27,212 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)] === [2023-11-19 07:51:27,212 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:27,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1364276454, now seen corresponding path program 1 times [2023-11-19 07:51:27,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:27,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924895305] [2023-11-19 07:51:27,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:27,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:27,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:27,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:27,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:27,474 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:27,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:27,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:27,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:27,545 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-19 07:51:27,546 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:27,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924895305] [2023-11-19 07:51:27,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924895305] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:51:27,546 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:51:27,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 07:51:27,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773737296] [2023-11-19 07:51:27,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:51:27,548 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 07:51:27,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:27,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 07:51:27,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:51:27,549 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 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) [2023-11-19 07:51:27,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:27,748 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2023-11-19 07:51:27,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:51:27,749 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 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 46 [2023-11-19 07:51:27,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:27,750 INFO L225 Difference]: With dead ends: 96 [2023-11-19 07:51:27,750 INFO L226 Difference]: Without dead ends: 96 [2023-11-19 07:51:27,750 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 [2023-11-19 07:51:27,751 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 22 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:27,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 334 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 07:51:27,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-11-19 07:51:27,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2023-11-19 07:51:27,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 67 states have (on average 1.4328358208955223) internal successors, (96), 91 states have internal predecessors, (96), 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) [2023-11-19 07:51:27,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2023-11-19 07:51:27,754 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 46 [2023-11-19 07:51:27,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:27,754 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2023-11-19 07:51:27,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 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) [2023-11-19 07:51:27,754 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2023-11-19 07:51:27,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 07:51:27,755 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:27,755 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:27,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-19 07:51:27,755 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)] === [2023-11-19 07:51:27,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:27,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1364287376, now seen corresponding path program 1 times [2023-11-19 07:51:27,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:27,756 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995265138] [2023-11-19 07:51:27,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:27,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:28,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:28,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:28,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:28,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:28,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:28,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:28,603 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-19 07:51:28,603 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:28,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995265138] [2023-11-19 07:51:28,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995265138] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:28,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465066355] [2023-11-19 07:51:28,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:28,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:28,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:28,605 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:28,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 07:51:29,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:29,246 INFO L262 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-19 07:51:29,250 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:29,288 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 [2023-11-19 07:51:29,551 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 [2023-11-19 07:51:29,682 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 [2023-11-19 07:51:29,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:29,710 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 [2023-11-19 07:51:29,721 INFO L349 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2023-11-19 07:51:29,722 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 [2023-11-19 07:51:29,805 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 [2023-11-19 07:51:29,818 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2023-11-19 07:51:29,818 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:51:29,876 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2384 (Array Int Int)) (|v_node_create_~temp~0#1.base_42| Int)) (or (= (select (store |c_#valid| |v_node_create_~temp~0#1.base_42| 1) (select (select (store |c_#memory_$Pointer$.base| |v_node_create_~temp~0#1.base_42| v_ArrVal_2384) |c_ULTIMATE.start_dll_circular_prepend_~head#1.base|) |c_ULTIMATE.start_dll_circular_prepend_~head#1.offset|)) 1) (< |c_#StackHeapBarrier| (+ |v_node_create_~temp~0#1.base_42| 1)))) is different from false [2023-11-19 07:51:29,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465066355] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:29,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:51:29,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2023-11-19 07:51:29,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137725198] [2023-11-19 07:51:29,878 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:51:29,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-19 07:51:29,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:51:29,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-19 07:51:29,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=573, Unknown=2, NotChecked=98, Total=756 [2023-11-19 07:51:29,880 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 27 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 07:51:30,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:51:30,832 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2023-11-19 07:51:30,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 07:51:30,832 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2023-11-19 07:51:30,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:51:30,833 INFO L225 Difference]: With dead ends: 113 [2023-11-19 07:51:30,833 INFO L226 Difference]: Without dead ends: 113 [2023-11-19 07:51:30,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=155, Invalid=973, Unknown=2, NotChecked=130, Total=1260 [2023-11-19 07:51:30,835 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 290 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 899 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 1024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 899 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 07:51:30,835 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 633 Invalid, 1024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 899 Invalid, 0 Unknown, 117 Unchecked, 0.7s Time] [2023-11-19 07:51:30,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-19 07:51:30,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 95. [2023-11-19 07:51:30,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 67 states have (on average 1.4179104477611941) internal successors, (95), 90 states have internal predecessors, (95), 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) [2023-11-19 07:51:30,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 101 transitions. [2023-11-19 07:51:30,838 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 101 transitions. Word has length 46 [2023-11-19 07:51:30,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:51:30,839 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 101 transitions. [2023-11-19 07:51:30,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 4 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 07:51:30,839 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 101 transitions. [2023-11-19 07:51:30,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-19 07:51:30,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:51:30,840 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 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] [2023-11-19 07:51:30,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 07:51:31,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:31,049 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)] === [2023-11-19 07:51:31,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:51:31,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1364287377, now seen corresponding path program 1 times [2023-11-19 07:51:31,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:51:31,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503778356] [2023-11-19 07:51:31,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:31,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:51:31,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:31,779 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 07:51:31,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:31,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2023-11-19 07:51:31,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:31,902 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2023-11-19 07:51:31,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:32,792 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 07:51:32,792 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:51:32,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503778356] [2023-11-19 07:51:32,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503778356] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:51:32,793 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351986817] [2023-11-19 07:51:32,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:51:32,793 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:51:32,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:51:32,794 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:51:32,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c1f3a27-76e2-47fb-ac36-f5889f55d5cf/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 07:51:33,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:51:33,262 INFO L262 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 63 conjunts are in the unsatisfiable core [2023-11-19 07:51:33,266 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:51:33,328 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 [2023-11-19 07:51:33,704 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 [2023-11-19 07:51:33,708 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 [2023-11-19 07:51:48,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:48,390 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 [2023-11-19 07:51:48,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 07:51:48,421 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 [2023-11-19 07:51:48,570 INFO L349 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2023-11-19 07:51:48,570 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 18 treesize of output 21 [2023-11-19 07:51:49,461 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 [2023-11-19 07:51:49,479 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 [2023-11-19 07:51:49,624 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 07:51:49,624 INFO L327 TraceCheckSpWp]: Computing backward predicates...