./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/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_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/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_317fec30-ea20-403f-bef8-f62e42d3bae6/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 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 08:00:03,165 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 08:00:03,298 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2023-11-19 08:00:03,303 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 08:00:03,304 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 08:00:03,338 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 08:00:03,339 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 08:00:03,339 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 08:00:03,340 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 08:00:03,341 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 08:00:03,341 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 08:00:03,342 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 08:00:03,342 INFO L153 SettingsManager]: * Use SBE=true [2023-11-19 08:00:03,343 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 08:00:03,344 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 08:00:03,344 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 08:00:03,345 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 08:00:03,345 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 08:00:03,346 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 08:00:03,346 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 08:00:03,347 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 08:00:03,348 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 08:00:03,348 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 08:00:03,349 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 08:00:03,351 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 08:00:03,351 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 08:00:03,352 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 08:00:03,352 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 08:00:03,353 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 08:00:03,353 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 08:00:03,354 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 08:00:03,354 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 08:00:03,355 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-19 08:00:03,355 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 08:00:03,355 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-19 08:00:03,356 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-19 08:00:03,361 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 08:00:03,361 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-19 08:00:03,362 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_317fec30-ea20-403f-bef8-f62e42d3bae6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2023-11-19 08:00:03,689 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 08:00:03,719 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 08:00:03,724 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 08:00:03,725 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 08:00:03,726 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 08:00:03,728 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-19 08:00:06,893 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 08:00:07,206 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 08:00:07,207 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-19 08:00:07,226 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/data/1ff8b274f/e69f157139b0474888dc971883e682ea/FLAG2dfa23f34 [2023-11-19 08:00:07,240 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/data/1ff8b274f/e69f157139b0474888dc971883e682ea [2023-11-19 08:00:07,243 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 08:00:07,245 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 08:00:07,246 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 08:00:07,246 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 08:00:07,252 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 08:00:07,256 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,261 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@763ab1d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07, skipping insertion in model container [2023-11-19 08:00:07,261 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,313 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 08:00:07,716 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 08:00:07,727 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 08:00:07,776 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 08:00:07,813 INFO L206 MainTranslator]: Completed translation [2023-11-19 08:00:07,813 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07 WrapperNode [2023-11-19 08:00:07,813 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 08:00:07,814 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 08:00:07,815 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 08:00:07,815 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 08:00:07,823 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,840 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,883 INFO L138 Inliner]: procedures = 129, calls = 80, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 215 [2023-11-19 08:00:07,890 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 08:00:07,891 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 08:00:07,891 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 08:00:07,892 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 08:00:07,902 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,904 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,921 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,922 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,951 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,967 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,971 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,982 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:07,987 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 08:00:07,997 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 08:00:07,997 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 08:00:07,997 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 08:00:07,998 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (1/1) ... [2023-11-19 08:00:08,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 08:00:08,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:08,038 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 08:00:08,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 08:00:08,089 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2023-11-19 08:00:08,089 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2023-11-19 08:00:08,089 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 08:00:08,090 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 08:00:08,090 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 08:00:08,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 08:00:08,090 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 08:00:08,090 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2023-11-19 08:00:08,090 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2023-11-19 08:00:08,091 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 08:00:08,091 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 08:00:08,091 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2023-11-19 08:00:08,091 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2023-11-19 08:00:08,091 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 08:00:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2023-11-19 08:00:08,092 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2023-11-19 08:00:08,092 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 08:00:08,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 08:00:08,298 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 08:00:08,300 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 08:00:08,952 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 08:00:08,971 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 08:00:08,971 INFO L302 CfgBuilder]: Removed 33 assume(true) statements. [2023-11-19 08:00:08,978 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:00:08 BoogieIcfgContainer [2023-11-19 08:00:08,979 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 08:00:08,981 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 08:00:08,982 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 08:00:08,986 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 08:00:08,987 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:00:07" (1/3) ... [2023-11-19 08:00:08,988 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69d6679d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:00:08, skipping insertion in model container [2023-11-19 08:00:08,988 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:00:07" (2/3) ... [2023-11-19 08:00:08,989 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69d6679d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:00:08, skipping insertion in model container [2023-11-19 08:00:08,989 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:00:08" (3/3) ... [2023-11-19 08:00:08,991 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2023-11-19 08:00:09,019 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 08:00:09,021 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2023-11-19 08:00:09,098 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 08:00:09,111 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;@843447f, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-19 08:00:09,111 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2023-11-19 08:00:09,117 INFO L276 IsEmpty]: Start isEmpty. Operand has 227 states, 125 states have (on average 2.064) internal successors, (258), 213 states have internal predecessors, (258), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-19 08:00:09,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 08:00:09,129 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:09,130 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 08:00:09,130 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:09,136 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:09,136 INFO L85 PathProgramCache]: Analyzing trace with hash 6467046, now seen corresponding path program 1 times [2023-11-19 08:00:09,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:09,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031064266] [2023-11-19 08:00:09,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:09,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:09,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:09,385 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 08:00:09,386 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:09,386 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031064266] [2023-11-19 08:00:09,387 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031064266] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:09,387 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:09,387 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 08:00:09,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792288901] [2023-11-19 08:00:09,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:09,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 08:00:09,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:09,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 08:00:09,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 08:00:09,453 INFO L87 Difference]: Start difference. First operand has 227 states, 125 states have (on average 2.064) internal successors, (258), 213 states have internal predecessors, (258), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 08:00:09,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:09,510 INFO L93 Difference]: Finished difference Result 223 states and 244 transitions. [2023-11-19 08:00:09,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 08:00:09,513 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-19 08:00:09,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:09,529 INFO L225 Difference]: With dead ends: 223 [2023-11-19 08:00:09,529 INFO L226 Difference]: Without dead ends: 221 [2023-11-19 08:00:09,531 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 08:00:09,536 INFO L413 NwaCegarLoop]: 244 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:09,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 08:00:09,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2023-11-19 08:00:09,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2023-11-19 08:00:09,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 118 states have (on average 1.8305084745762712) internal successors, (216), 207 states have internal predecessors, (216), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:09,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 242 transitions. [2023-11-19 08:00:09,624 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 242 transitions. Word has length 4 [2023-11-19 08:00:09,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:09,625 INFO L495 AbstractCegarLoop]: Abstraction has 221 states and 242 transitions. [2023-11-19 08:00:09,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 08:00:09,626 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 242 transitions. [2023-11-19 08:00:09,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 08:00:09,626 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:09,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 08:00:09,627 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 08:00:09,628 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:09,629 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:09,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1928882188, now seen corresponding path program 1 times [2023-11-19 08:00:09,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:09,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574036599] [2023-11-19 08:00:09,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:09,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:09,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:09,841 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 08:00:09,841 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:09,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574036599] [2023-11-19 08:00:09,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574036599] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:09,843 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:09,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 08:00:09,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236732925] [2023-11-19 08:00:09,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:09,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 08:00:09,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:09,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 08:00:09,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 08:00:09,846 INFO L87 Difference]: Start difference. First operand 221 states and 242 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 08:00:10,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:10,072 INFO L93 Difference]: Finished difference Result 219 states and 240 transitions. [2023-11-19 08:00:10,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 08:00:10,072 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 08:00:10,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:10,075 INFO L225 Difference]: With dead ends: 219 [2023-11-19 08:00:10,075 INFO L226 Difference]: Without dead ends: 219 [2023-11-19 08:00:10,075 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 08:00:10,077 INFO L413 NwaCegarLoop]: 234 mSDtfsCounter, 5 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:10,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 385 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 08:00:10,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2023-11-19 08:00:10,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2023-11-19 08:00:10,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 118 states have (on average 1.8135593220338984) internal successors, (214), 205 states have internal predecessors, (214), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:10,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 240 transitions. [2023-11-19 08:00:10,094 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 240 transitions. Word has length 6 [2023-11-19 08:00:10,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:10,094 INFO L495 AbstractCegarLoop]: Abstraction has 219 states and 240 transitions. [2023-11-19 08:00:10,095 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 08:00:10,095 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 240 transitions. [2023-11-19 08:00:10,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 08:00:10,096 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:10,096 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 08:00:10,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 08:00:10,096 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:10,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:10,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1928882189, now seen corresponding path program 1 times [2023-11-19 08:00:10,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:10,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092902073] [2023-11-19 08:00:10,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:10,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:10,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:10,222 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 08:00:10,222 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:10,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092902073] [2023-11-19 08:00:10,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092902073] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:10,223 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:10,224 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 08:00:10,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890323942] [2023-11-19 08:00:10,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:10,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 08:00:10,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:10,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 08:00:10,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 08:00:10,229 INFO L87 Difference]: Start difference. First operand 219 states and 240 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 08:00:10,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:10,371 INFO L93 Difference]: Finished difference Result 217 states and 238 transitions. [2023-11-19 08:00:10,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 08:00:10,373 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 08:00:10,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:10,378 INFO L225 Difference]: With dead ends: 217 [2023-11-19 08:00:10,378 INFO L226 Difference]: Without dead ends: 217 [2023-11-19 08:00:10,379 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 08:00:10,386 INFO L413 NwaCegarLoop]: 234 mSDtfsCounter, 3 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:10,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 390 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 08:00:10,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2023-11-19 08:00:10,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2023-11-19 08:00:10,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 118 states have (on average 1.7966101694915255) internal successors, (212), 203 states have internal predecessors, (212), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:10,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 238 transitions. [2023-11-19 08:00:10,421 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 238 transitions. Word has length 6 [2023-11-19 08:00:10,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:10,422 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 238 transitions. [2023-11-19 08:00:10,422 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 08:00:10,422 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 238 transitions. [2023-11-19 08:00:10,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 08:00:10,424 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:10,424 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:10,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 08:00:10,425 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:10,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:10,427 INFO L85 PathProgramCache]: Analyzing trace with hash -244578512, now seen corresponding path program 1 times [2023-11-19 08:00:10,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:10,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422964596] [2023-11-19 08:00:10,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:10,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:10,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:10,696 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 08:00:10,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:10,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422964596] [2023-11-19 08:00:10,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1422964596] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:10,697 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:10,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 08:00:10,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964486208] [2023-11-19 08:00:10,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:10,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 08:00:10,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:10,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 08:00:10,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 08:00:10,699 INFO L87 Difference]: Start difference. First operand 217 states and 238 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 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 08:00:10,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:10,974 INFO L93 Difference]: Finished difference Result 212 states and 233 transitions. [2023-11-19 08:00:10,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 08:00:10,975 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 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 10 [2023-11-19 08:00:10,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:10,977 INFO L225 Difference]: With dead ends: 212 [2023-11-19 08:00:10,977 INFO L226 Difference]: Without dead ends: 212 [2023-11-19 08:00:10,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:10,979 INFO L413 NwaCegarLoop]: 210 mSDtfsCounter, 56 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 613 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:10,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 613 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 08:00:10,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2023-11-19 08:00:10,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 212. [2023-11-19 08:00:10,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 118 states have (on average 1.7542372881355932) internal successors, (207), 198 states have internal predecessors, (207), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:10,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 233 transitions. [2023-11-19 08:00:10,990 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 233 transitions. Word has length 10 [2023-11-19 08:00:10,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:10,990 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 233 transitions. [2023-11-19 08:00:10,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 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 08:00:10,991 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 233 transitions. [2023-11-19 08:00:10,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 08:00:10,991 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:10,992 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:10,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 08:00:10,992 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:10,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:10,993 INFO L85 PathProgramCache]: Analyzing trace with hash -244578511, now seen corresponding path program 1 times [2023-11-19 08:00:10,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:10,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765998440] [2023-11-19 08:00:10,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:10,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:11,337 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 08:00:11,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:11,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765998440] [2023-11-19 08:00:11,338 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765998440] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:11,338 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:11,339 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 08:00:11,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659770136] [2023-11-19 08:00:11,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:11,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 08:00:11,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:11,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 08:00:11,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 08:00:11,341 INFO L87 Difference]: Start difference. First operand 212 states and 233 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 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 08:00:11,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:11,677 INFO L93 Difference]: Finished difference Result 207 states and 228 transitions. [2023-11-19 08:00:11,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 08:00:11,678 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 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 10 [2023-11-19 08:00:11,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:11,680 INFO L225 Difference]: With dead ends: 207 [2023-11-19 08:00:11,680 INFO L226 Difference]: Without dead ends: 207 [2023-11-19 08:00:11,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 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 08:00:11,682 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 39 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 551 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:11,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 551 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 08:00:11,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2023-11-19 08:00:11,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2023-11-19 08:00:11,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 118 states have (on average 1.7118644067796611) internal successors, (202), 193 states have internal predecessors, (202), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:11,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 228 transitions. [2023-11-19 08:00:11,693 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 228 transitions. Word has length 10 [2023-11-19 08:00:11,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:11,693 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 228 transitions. [2023-11-19 08:00:11,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 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 08:00:11,694 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 228 transitions. [2023-11-19 08:00:11,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 08:00:11,695 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:11,695 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:11,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 08:00:11,696 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:11,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:11,697 INFO L85 PathProgramCache]: Analyzing trace with hash 1008000862, now seen corresponding path program 1 times [2023-11-19 08:00:11,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:11,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838066967] [2023-11-19 08:00:11,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:11,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:11,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:11,782 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 08:00:11,783 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:11,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838066967] [2023-11-19 08:00:11,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838066967] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:11,783 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:11,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 08:00:11,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195873281] [2023-11-19 08:00:11,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:11,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 08:00:11,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:11,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 08:00:11,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 08:00:11,791 INFO L87 Difference]: Start difference. First operand 207 states and 228 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 08:00:12,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:12,037 INFO L93 Difference]: Finished difference Result 206 states and 227 transitions. [2023-11-19 08:00:12,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 08:00:12,038 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2023-11-19 08:00:12,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:12,040 INFO L225 Difference]: With dead ends: 206 [2023-11-19 08:00:12,040 INFO L226 Difference]: Without dead ends: 206 [2023-11-19 08:00:12,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:12,044 INFO L413 NwaCegarLoop]: 218 mSDtfsCounter, 14 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 640 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:12,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 640 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 08:00:12,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2023-11-19 08:00:12,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2023-11-19 08:00:12,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 118 states have (on average 1.7033898305084745) internal successors, (201), 192 states have internal predecessors, (201), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:12,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 227 transitions. [2023-11-19 08:00:12,064 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 227 transitions. Word has length 11 [2023-11-19 08:00:12,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:12,065 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 227 transitions. [2023-11-19 08:00:12,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 08:00:12,066 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 227 transitions. [2023-11-19 08:00:12,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 08:00:12,067 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:12,067 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:12,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 08:00:12,068 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:12,069 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:12,069 INFO L85 PathProgramCache]: Analyzing trace with hash 1008000863, now seen corresponding path program 1 times [2023-11-19 08:00:12,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:12,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652307476] [2023-11-19 08:00:12,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:12,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:12,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:12,252 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 08:00:12,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:12,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652307476] [2023-11-19 08:00:12,253 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652307476] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:12,253 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:12,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 08:00:12,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161545269] [2023-11-19 08:00:12,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:12,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 08:00:12,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:12,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 08:00:12,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 08:00:12,256 INFO L87 Difference]: Start difference. First operand 206 states and 227 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 08:00:12,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:12,515 INFO L93 Difference]: Finished difference Result 205 states and 226 transitions. [2023-11-19 08:00:12,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 08:00:12,517 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 11 [2023-11-19 08:00:12,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:12,519 INFO L225 Difference]: With dead ends: 205 [2023-11-19 08:00:12,519 INFO L226 Difference]: Without dead ends: 205 [2023-11-19 08:00:12,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:12,520 INFO L413 NwaCegarLoop]: 218 mSDtfsCounter, 11 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 655 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:12,521 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 655 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 08:00:12,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2023-11-19 08:00:12,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2023-11-19 08:00:12,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 118 states have (on average 1.694915254237288) internal successors, (200), 191 states have internal predecessors, (200), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:12,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 226 transitions. [2023-11-19 08:00:12,532 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 226 transitions. Word has length 11 [2023-11-19 08:00:12,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:12,532 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 226 transitions. [2023-11-19 08:00:12,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 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 08:00:12,532 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 226 transitions. [2023-11-19 08:00:12,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 08:00:12,534 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:12,534 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:12,534 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 08:00:12,534 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:12,535 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:12,536 INFO L85 PathProgramCache]: Analyzing trace with hash 271209990, now seen corresponding path program 1 times [2023-11-19 08:00:12,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:12,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185657628] [2023-11-19 08:00:12,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:12,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:12,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:12,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:12,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:12,846 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 08:00:12,846 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:12,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185657628] [2023-11-19 08:00:12,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185657628] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:12,846 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:12,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 08:00:12,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217188528] [2023-11-19 08:00:12,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:12,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 08:00:12,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:12,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 08:00:12,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:12,849 INFO L87 Difference]: Start difference. First operand 205 states and 226 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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 08:00:13,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:13,397 INFO L93 Difference]: Finished difference Result 204 states and 225 transitions. [2023-11-19 08:00:13,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 08:00:13,398 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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 19 [2023-11-19 08:00:13,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:13,399 INFO L225 Difference]: With dead ends: 204 [2023-11-19 08:00:13,399 INFO L226 Difference]: Without dead ends: 204 [2023-11-19 08:00:13,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:13,401 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 70 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:13,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 446 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 08:00:13,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2023-11-19 08:00:13,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2023-11-19 08:00:13,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 118 states have (on average 1.6864406779661016) internal successors, (199), 190 states have internal predecessors, (199), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:13,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 225 transitions. [2023-11-19 08:00:13,408 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 225 transitions. Word has length 19 [2023-11-19 08:00:13,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:13,410 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 225 transitions. [2023-11-19 08:00:13,410 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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 08:00:13,410 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 225 transitions. [2023-11-19 08:00:13,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 08:00:13,411 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:13,411 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:13,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-19 08:00:13,412 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:13,412 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:13,412 INFO L85 PathProgramCache]: Analyzing trace with hash 271209991, now seen corresponding path program 1 times [2023-11-19 08:00:13,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:13,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165119085] [2023-11-19 08:00:13,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:13,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:13,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:13,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:13,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:14,041 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 08:00:14,041 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:14,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165119085] [2023-11-19 08:00:14,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165119085] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:14,042 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:14,042 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 08:00:14,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454405921] [2023-11-19 08:00:14,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:14,044 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 08:00:14,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:14,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 08:00:14,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:14,046 INFO L87 Difference]: Start difference. First operand 204 states and 225 transitions. Second operand has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 08:00:14,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:14,593 INFO L93 Difference]: Finished difference Result 212 states and 237 transitions. [2023-11-19 08:00:14,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 08:00:14,594 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 19 [2023-11-19 08:00:14,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:14,597 INFO L225 Difference]: With dead ends: 212 [2023-11-19 08:00:14,597 INFO L226 Difference]: Without dead ends: 212 [2023-11-19 08:00:14,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-19 08:00:14,598 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 100 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 530 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:14,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 406 Invalid, 530 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 08:00:14,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2023-11-19 08:00:14,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 209. [2023-11-19 08:00:14,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 122 states have (on average 1.6721311475409837) internal successors, (204), 194 states have internal predecessors, (204), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 08:00:14,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 232 transitions. [2023-11-19 08:00:14,607 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 232 transitions. Word has length 19 [2023-11-19 08:00:14,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:14,607 INFO L495 AbstractCegarLoop]: Abstraction has 209 states and 232 transitions. [2023-11-19 08:00:14,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.4) internal successors, (17), 6 states have internal predecessors, (17), 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 08:00:14,608 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 232 transitions. [2023-11-19 08:00:14,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-19 08:00:14,609 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:14,609 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:14,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 08:00:14,610 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:14,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:14,610 INFO L85 PathProgramCache]: Analyzing trace with hash -931932026, now seen corresponding path program 1 times [2023-11-19 08:00:14,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:14,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590396411] [2023-11-19 08:00:14,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:14,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:14,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:15,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:15,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:15,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2023-11-19 08:00:15,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:15,659 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 08:00:15,659 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:15,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590396411] [2023-11-19 08:00:15,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590396411] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:15,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430170334] [2023-11-19 08:00:15,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:15,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 08:00:15,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:15,668 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 08:00:15,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 08:00:15,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:15,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-19 08:00:15,876 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 08:00:15,971 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 08:00:15,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-19 08:00:16,015 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 08:00:16,016 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 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-19 08:00:16,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,048 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-19 08:00:16,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,063 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 1 [2023-11-19 08:00:16,073 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 08:00:16,091 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-19 08:00:16,112 INFO L349 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2023-11-19 08:00:16,112 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 1 case distinctions, treesize of input 9 treesize of output 1 [2023-11-19 08:00:16,179 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 08:00:16,179 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 08:00:16,191 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 08:00:16,228 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (and (<= (+ 1 |chain_node_alloc_node_~ptr~0#1.base|) |c_#StackHeapBarrier|) (= (select |c_old(#valid)| |chain_node_alloc_node_~ptr~0#1.base|) 0) (= (store |c_old(#length)| |chain_node_alloc_node_~ptr~0#1.base| (select |c_#length| |chain_node_alloc_node_~ptr~0#1.base|)) |c_#length|))) is different from true [2023-11-19 08:00:16,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,396 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 08:00:16,396 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 17 [2023-11-19 08:00:16,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,405 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 08:00:16,497 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 08:00:16,498 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 08:00:16,579 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int)) (and (= |c_#length| (store |c_old(#length)| |chain_node_~node~0#1.base| (select |c_#length| |chain_node_~node~0#1.base|))) (<= (+ |chain_node_~node~0#1.base| 1) |c_#StackHeapBarrier|))) is different from true [2023-11-19 08:00:16,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:16,646 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 08:00:16,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 17 [2023-11-19 08:00:16,673 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 11 not checked. [2023-11-19 08:00:16,673 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 08:00:16,846 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430170334] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:16,846 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 08:00:16,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2023-11-19 08:00:16,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452266015] [2023-11-19 08:00:16,847 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 08:00:16,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-19 08:00:16,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:16,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-19 08:00:16,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=245, Unknown=2, NotChecked=66, Total=380 [2023-11-19 08:00:16,849 INFO L87 Difference]: Start difference. First operand 209 states and 232 transitions. Second operand has 18 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 08:00:18,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:18,146 INFO L93 Difference]: Finished difference Result 210 states and 235 transitions. [2023-11-19 08:00:18,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 08:00:18,147 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2023-11-19 08:00:18,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:18,148 INFO L225 Difference]: With dead ends: 210 [2023-11-19 08:00:18,149 INFO L226 Difference]: Without dead ends: 210 [2023-11-19 08:00:18,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=89, Invalid=337, Unknown=2, NotChecked=78, Total=506 [2023-11-19 08:00:18,150 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 86 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 1160 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 840 SdHoareTripleChecker+Invalid, 1633 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 443 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:18,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 840 Invalid, 1633 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1160 Invalid, 0 Unknown, 443 Unchecked, 1.1s Time] [2023-11-19 08:00:18,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-11-19 08:00:18,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 203. [2023-11-19 08:00:18,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 118 states have (on average 1.6779661016949152) internal successors, (198), 189 states have internal predecessors, (198), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:18,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 224 transitions. [2023-11-19 08:00:18,160 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 224 transitions. Word has length 34 [2023-11-19 08:00:18,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:18,162 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 224 transitions. [2023-11-19 08:00:18,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 15 states have (on average 3.8666666666666667) internal successors, (58), 15 states have internal predecessors, (58), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 08:00:18,162 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 224 transitions. [2023-11-19 08:00:18,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 08:00:18,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:18,164 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 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 08:00:18,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 08:00:18,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 08:00:18,381 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:18,381 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:18,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1459497081, now seen corresponding path program 1 times [2023-11-19 08:00:18,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:18,382 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740242873] [2023-11-19 08:00:18,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:18,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:18,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:18,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:18,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:18,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:18,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 08:00:18,982 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:18,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740242873] [2023-11-19 08:00:18,983 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740242873] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:18,983 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573038013] [2023-11-19 08:00:18,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:18,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 08:00:18,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:18,985 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 08:00:19,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 08:00:19,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:19,174 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 08:00:19,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 08:00:19,216 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-19 08:00:19,216 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 1 case distinctions, treesize of input 11 treesize of output 9 [2023-11-19 08:00:19,254 INFO L349 Elim1Store]: treesize reduction 28, result has 30.0 percent of original size [2023-11-19 08:00:19,254 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 08:00:19,302 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 12 treesize of output 10 [2023-11-19 08:00:19,378 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |chain_node_~node~0#1.base| 1))) is different from true [2023-11-19 08:00:19,411 INFO L349 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-11-19 08:00:19,411 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 19 treesize of output 25 [2023-11-19 08:00:19,743 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 08:00:19,743 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 37 treesize of output 106 [2023-11-19 08:00:19,936 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (and (<= (+ 1 |chain_node_alloc_node_~ptr~0#1.base|) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |chain_node_alloc_node_~ptr~0#1.base| (select |c_#valid| |chain_node_alloc_node_~ptr~0#1.base|))))) is different from true [2023-11-19 08:00:20,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:20,167 INFO L349 Elim1Store]: treesize reduction 80, result has 51.5 percent of original size [2023-11-19 08:00:20,167 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 46 treesize of output 115 [2023-11-19 08:00:23,552 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 11 not checked. [2023-11-19 08:00:23,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 08:00:23,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573038013] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:23,644 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 08:00:23,645 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 18 [2023-11-19 08:00:23,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713582927] [2023-11-19 08:00:23,645 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 08:00:23,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 08:00:23,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:23,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 08:00:23,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=280, Unknown=2, NotChecked=70, Total=420 [2023-11-19 08:00:23,647 INFO L87 Difference]: Start difference. First operand 203 states and 224 transitions. Second operand has 19 states, 16 states have (on average 3.8125) internal successors, (61), 17 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 08:00:24,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:24,762 INFO L93 Difference]: Finished difference Result 202 states and 223 transitions. [2023-11-19 08:00:24,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 08:00:24,763 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 3.8125) internal successors, (61), 17 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2023-11-19 08:00:24,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:24,765 INFO L225 Difference]: With dead ends: 202 [2023-11-19 08:00:24,765 INFO L226 Difference]: Without dead ends: 202 [2023-11-19 08:00:24,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=449, Unknown=2, NotChecked=90, Total=650 [2023-11-19 08:00:24,766 INFO L413 NwaCegarLoop]: 153 mSDtfsCounter, 329 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 951 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 767 SdHoareTripleChecker+Invalid, 1475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 951 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 431 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:24,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [329 Valid, 767 Invalid, 1475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 951 Invalid, 0 Unknown, 431 Unchecked, 0.9s Time] [2023-11-19 08:00:24,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2023-11-19 08:00:24,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 202. [2023-11-19 08:00:24,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 118 states have (on average 1.6694915254237288) internal successors, (197), 188 states have internal predecessors, (197), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:24,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 223 transitions. [2023-11-19 08:00:24,774 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 223 transitions. Word has length 37 [2023-11-19 08:00:24,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:24,774 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 223 transitions. [2023-11-19 08:00:24,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 3.8125) internal successors, (61), 17 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 08:00:24,775 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 223 transitions. [2023-11-19 08:00:24,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 08:00:24,776 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:24,776 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 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 08:00:24,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 08:00:24,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-19 08:00:24,992 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:24,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:24,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1459497080, now seen corresponding path program 1 times [2023-11-19 08:00:24,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:24,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82356553] [2023-11-19 08:00:24,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:24,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:25,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:25,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:25,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:26,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:26,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:26,310 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 08:00:26,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:26,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82356553] [2023-11-19 08:00:26,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82356553] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:26,311 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505056120] [2023-11-19 08:00:26,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:26,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 08:00:26,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:26,313 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 08:00:26,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 08:00:26,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:26,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-19 08:00:26,501 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 08:00:26,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,536 INFO L349 Elim1Store]: treesize reduction 31, result has 13.9 percent of original size [2023-11-19 08:00:26,537 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 16 [2023-11-19 08:00:26,545 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 42 treesize of output 38 [2023-11-19 08:00:26,630 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-19 08:00:26,630 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 10 [2023-11-19 08:00:26,655 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (and (<= (+ 1 |chain_node_alloc_node_~ptr~0#1.base|) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |chain_node_alloc_node_~ptr~0#1.base| (select |c_#length| |chain_node_alloc_node_~ptr~0#1.base|)) |c_#length|))) is different from true [2023-11-19 08:00:26,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,734 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-19 08:00:26,735 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 25 [2023-11-19 08:00:26,896 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-19 08:00:26,896 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 10 [2023-11-19 08:00:26,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:26,996 INFO L349 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2023-11-19 08:00:26,996 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 25 [2023-11-19 08:00:27,080 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-19 08:00:27,081 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 08:00:27,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505056120] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:27,081 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 08:00:27,081 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [13] total 17 [2023-11-19 08:00:27,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093576422] [2023-11-19 08:00:27,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:27,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 08:00:27,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:27,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 08:00:27,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=225, Unknown=1, NotChecked=30, Total=306 [2023-11-19 08:00:27,083 INFO L87 Difference]: Start difference. First operand 202 states and 223 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 08:00:27,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:27,563 INFO L93 Difference]: Finished difference Result 210 states and 235 transitions. [2023-11-19 08:00:27,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 08:00:27,563 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2023-11-19 08:00:27,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:27,565 INFO L225 Difference]: With dead ends: 210 [2023-11-19 08:00:27,566 INFO L226 Difference]: Without dead ends: 210 [2023-11-19 08:00:27,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=225, Unknown=1, NotChecked=30, Total=306 [2023-11-19 08:00:27,567 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 55 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 278 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:27,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 413 Invalid, 648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 358 Invalid, 0 Unknown, 278 Unchecked, 0.5s Time] [2023-11-19 08:00:27,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-11-19 08:00:27,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 207. [2023-11-19 08:00:27,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 122 states have (on average 1.6557377049180328) internal successors, (202), 192 states have internal predecessors, (202), 18 states have call successors, (18), 4 states have call predecessors, (18), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 08:00:27,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 230 transitions. [2023-11-19 08:00:27,575 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 230 transitions. Word has length 37 [2023-11-19 08:00:27,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:27,575 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 230 transitions. [2023-11-19 08:00:27,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 08:00:27,576 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 230 transitions. [2023-11-19 08:00:27,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-19 08:00:27,577 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:27,577 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:27,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 08:00:27,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 08:00:27,793 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:27,793 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:27,794 INFO L85 PathProgramCache]: Analyzing trace with hash 882795465, now seen corresponding path program 1 times [2023-11-19 08:00:27,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:27,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736120212] [2023-11-19 08:00:27,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:27,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:27,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:28,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:28,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:29,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:29,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:29,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2023-11-19 08:00:29,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:29,686 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 08:00:29,687 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:29,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736120212] [2023-11-19 08:00:29,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736120212] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:29,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143063939] [2023-11-19 08:00:29,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:29,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 08:00:29,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:29,689 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 08:00:29,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 08:00:29,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:29,912 INFO L262 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-19 08:00:29,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 08:00:29,949 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-19 08:00:29,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:29,955 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 9 [2023-11-19 08:00:29,963 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-11-19 08:00:29,982 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-19 08:00:29,984 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2023-11-19 08:00:29,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:29,991 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 17 treesize of output 9 [2023-11-19 08:00:30,002 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2023-11-19 08:00:30,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:30,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:30,031 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 9 [2023-11-19 08:00:30,043 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2023-11-19 08:00:30,242 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 08:00:30,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 98 treesize of output 135 [2023-11-19 08:00:30,316 INFO L349 Elim1Store]: treesize reduction 5, result has 89.8 percent of original size [2023-11-19 08:00:30,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 116 [2023-11-19 08:00:31,028 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (and (<= (+ 1 |chain_node_alloc_node_~ptr~0#1.base|) |c_#StackHeapBarrier|) (= (select |c_old(#valid)| |chain_node_alloc_node_~ptr~0#1.base|) 0) (= (store |c_old(#length)| |chain_node_alloc_node_~ptr~0#1.base| (select |c_#length| |chain_node_alloc_node_~ptr~0#1.base|)) |c_#length|))) is different from true [2023-11-19 08:00:31,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:31,266 INFO L349 Elim1Store]: treesize reduction 80, result has 28.6 percent of original size [2023-11-19 08:00:31,270 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 107 treesize of output 121 [2023-11-19 08:00:31,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:31,389 INFO L349 Elim1Store]: treesize reduction 4, result has 94.5 percent of original size [2023-11-19 08:00:31,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 100 treesize of output 154 [2023-11-19 08:00:33,013 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-19 08:00:33,013 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 65 treesize of output 132 [2023-11-19 08:00:33,122 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (and (<= (+ 1 |chain_node_alloc_node_~ptr~0#1.base|) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |chain_node_alloc_node_~ptr~0#1.base| (select |c_#length| |chain_node_alloc_node_~ptr~0#1.base|)) |c_#length|))) is different from true [2023-11-19 08:00:33,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:33,350 INFO L349 Elim1Store]: treesize reduction 80, result has 51.5 percent of original size [2023-11-19 08:00:33,350 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 74 treesize of output 141 [2023-11-19 08:00:38,103 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 08:00:38,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:38,166 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 08:00:38,200 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 22 not checked. [2023-11-19 08:00:38,200 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 08:00:38,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143063939] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:38,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 08:00:38,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 25 [2023-11-19 08:00:38,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742834540] [2023-11-19 08:00:38,322 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 08:00:38,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-19 08:00:38,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:38,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-19 08:00:38,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=557, Unknown=2, NotChecked=98, Total=756 [2023-11-19 08:00:38,325 INFO L87 Difference]: Start difference. First operand 207 states and 230 transitions. Second operand has 26 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 4 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 08:00:40,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:40,065 INFO L93 Difference]: Finished difference Result 221 states and 248 transitions. [2023-11-19 08:00:40,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 08:00:40,066 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 4 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 52 [2023-11-19 08:00:40,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:40,068 INFO L225 Difference]: With dead ends: 221 [2023-11-19 08:00:40,068 INFO L226 Difference]: Without dead ends: 221 [2023-11-19 08:00:40,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=150, Invalid=786, Unknown=2, NotChecked=118, Total=1056 [2023-11-19 08:00:40,076 INFO L413 NwaCegarLoop]: 155 mSDtfsCounter, 125 mSDsluCounter, 718 mSDsCounter, 0 mSdLazyCounter, 1219 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 873 SdHoareTripleChecker+Invalid, 1692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 446 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:40,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 873 Invalid, 1692 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1219 Invalid, 0 Unknown, 446 Unchecked, 1.4s Time] [2023-11-19 08:00:40,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2023-11-19 08:00:40,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 201. [2023-11-19 08:00:40,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 118 states have (on average 1.6610169491525424) internal successors, (196), 187 states have internal predecessors, (196), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:40,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 222 transitions. [2023-11-19 08:00:40,088 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 222 transitions. Word has length 52 [2023-11-19 08:00:40,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:40,091 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 222 transitions. [2023-11-19 08:00:40,093 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 3.3333333333333335) internal successors, (80), 23 states have internal predecessors, (80), 4 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-19 08:00:40,094 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 222 transitions. [2023-11-19 08:00:40,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-11-19 08:00:40,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:40,095 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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 08:00:40,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 08:00:40,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-19 08:00:40,297 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:40,298 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:40,298 INFO L85 PathProgramCache]: Analyzing trace with hash 13489156, now seen corresponding path program 1 times [2023-11-19 08:00:40,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:40,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395271379] [2023-11-19 08:00:40,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:40,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:40,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:40,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:40,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:40,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:40,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:40,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2023-11-19 08:00:40,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:40,906 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 08:00:40,906 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:40,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395271379] [2023-11-19 08:00:40,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395271379] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:40,907 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:40,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 08:00:40,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747908342] [2023-11-19 08:00:40,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:40,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 08:00:40,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:40,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 08:00:40,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-19 08:00:40,910 INFO L87 Difference]: Start difference. First operand 201 states and 222 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 08:00:41,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:41,466 INFO L93 Difference]: Finished difference Result 206 states and 228 transitions. [2023-11-19 08:00:41,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 08:00:41,466 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 58 [2023-11-19 08:00:41,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:41,468 INFO L225 Difference]: With dead ends: 206 [2023-11-19 08:00:41,468 INFO L226 Difference]: Without dead ends: 206 [2023-11-19 08:00:41,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-19 08:00:41,469 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 225 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 673 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 673 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:41,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 383 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 673 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 08:00:41,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2023-11-19 08:00:41,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 194. [2023-11-19 08:00:41,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 118 states have (on average 1.6016949152542372) internal successors, (189), 180 states have internal predecessors, (189), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 08:00:41,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 215 transitions. [2023-11-19 08:00:41,478 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 215 transitions. Word has length 58 [2023-11-19 08:00:41,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:41,481 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 215 transitions. [2023-11-19 08:00:41,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 08:00:41,482 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 215 transitions. [2023-11-19 08:00:41,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-11-19 08:00:41,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:41,487 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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 08:00:41,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-19 08:00:41,488 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:41,489 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:41,489 INFO L85 PathProgramCache]: Analyzing trace with hash 13489157, now seen corresponding path program 1 times [2023-11-19 08:00:41,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:41,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193596690] [2023-11-19 08:00:41,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:41,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:41,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:41,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:41,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:41,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:41,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:41,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2023-11-19 08:00:41,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:41,977 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 08:00:41,977 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:41,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193596690] [2023-11-19 08:00:41,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193596690] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:41,977 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:41,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-19 08:00:41,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117375977] [2023-11-19 08:00:41,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:41,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 08:00:41,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:41,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 08:00:41,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-19 08:00:41,979 INFO L87 Difference]: Start difference. First operand 194 states and 215 transitions. Second operand has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 08:00:42,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:42,703 INFO L93 Difference]: Finished difference Result 328 states and 369 transitions. [2023-11-19 08:00:42,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 08:00:42,703 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 58 [2023-11-19 08:00:42,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:42,706 INFO L225 Difference]: With dead ends: 328 [2023-11-19 08:00:42,706 INFO L226 Difference]: Without dead ends: 328 [2023-11-19 08:00:42,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-11-19 08:00:42,707 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 290 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 297 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:42,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [297 Valid, 397 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-19 08:00:42,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2023-11-19 08:00:42,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 256. [2023-11-19 08:00:42,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 174 states have (on average 1.6264367816091954) internal successors, (283), 236 states have internal predecessors, (283), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 08:00:42,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 321 transitions. [2023-11-19 08:00:42,720 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 321 transitions. Word has length 58 [2023-11-19 08:00:42,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:42,720 INFO L495 AbstractCegarLoop]: Abstraction has 256 states and 321 transitions. [2023-11-19 08:00:42,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.857142857142857) internal successors, (41), 7 states have internal predecessors, (41), 2 states have call successors, (3), 1 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 08:00:42,720 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 321 transitions. [2023-11-19 08:00:42,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-19 08:00:42,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:42,723 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1] [2023-11-19 08:00:42,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-19 08:00:42,723 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:42,724 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:42,724 INFO L85 PathProgramCache]: Analyzing trace with hash 418164065, now seen corresponding path program 1 times [2023-11-19 08:00:42,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:42,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44806836] [2023-11-19 08:00:42,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:42,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:42,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:43,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:43,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:43,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:43,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:43,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2023-11-19 08:00:43,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:43,451 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 08:00:43,451 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:43,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44806836] [2023-11-19 08:00:43,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44806836] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:43,452 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:43,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 08:00:43,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617378322] [2023-11-19 08:00:43,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:43,453 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 08:00:43,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:43,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 08:00:43,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-19 08:00:43,454 INFO L87 Difference]: Start difference. First operand 256 states and 321 transitions. Second operand has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 08:00:44,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:44,001 INFO L93 Difference]: Finished difference Result 261 states and 321 transitions. [2023-11-19 08:00:44,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 08:00:44,002 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 59 [2023-11-19 08:00:44,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:44,004 INFO L225 Difference]: With dead ends: 261 [2023-11-19 08:00:44,004 INFO L226 Difference]: Without dead ends: 261 [2023-11-19 08:00:44,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2023-11-19 08:00:44,005 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 226 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:44,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 373 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 648 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 08:00:44,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2023-11-19 08:00:44,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 249. [2023-11-19 08:00:44,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 174 states have (on average 1.5517241379310345) internal successors, (270), 229 states have internal predecessors, (270), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 08:00:44,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 308 transitions. [2023-11-19 08:00:44,015 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 308 transitions. Word has length 59 [2023-11-19 08:00:44,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:44,015 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 308 transitions. [2023-11-19 08:00:44,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 08:00:44,016 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 308 transitions. [2023-11-19 08:00:44,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-19 08:00:44,017 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:44,017 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1] [2023-11-19 08:00:44,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-19 08:00:44,017 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:44,018 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:44,018 INFO L85 PathProgramCache]: Analyzing trace with hash 418164066, now seen corresponding path program 1 times [2023-11-19 08:00:44,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:44,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160665425] [2023-11-19 08:00:44,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:44,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:44,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:44,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:44,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:44,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:44,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:44,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2023-11-19 08:00:44,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:44,671 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-19 08:00:44,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:44,671 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160665425] [2023-11-19 08:00:44,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160665425] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 08:00:44,672 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 08:00:44,672 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 08:00:44,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158295872] [2023-11-19 08:00:44,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 08:00:44,673 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 08:00:44,673 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:44,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 08:00:44,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-19 08:00:44,674 INFO L87 Difference]: Start difference. First operand 249 states and 308 transitions. Second operand has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 08:00:45,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 08:00:45,337 INFO L93 Difference]: Finished difference Result 256 states and 312 transitions. [2023-11-19 08:00:45,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 08:00:45,338 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 59 [2023-11-19 08:00:45,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 08:00:45,340 INFO L225 Difference]: With dead ends: 256 [2023-11-19 08:00:45,340 INFO L226 Difference]: Without dead ends: 256 [2023-11-19 08:00:45,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-19 08:00:45,341 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 250 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 655 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 08:00:45,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 247 Invalid, 697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 655 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 08:00:45,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2023-11-19 08:00:45,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 242. [2023-11-19 08:00:45,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 174 states have (on average 1.4770114942528736) internal successors, (257), 222 states have internal predecessors, (257), 23 states have call successors, (23), 4 states have call predecessors, (23), 3 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 08:00:45,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 295 transitions. [2023-11-19 08:00:45,350 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 295 transitions. Word has length 59 [2023-11-19 08:00:45,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 08:00:45,350 INFO L495 AbstractCegarLoop]: Abstraction has 242 states and 295 transitions. [2023-11-19 08:00:45,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.25) internal successors, (42), 8 states have internal predecessors, (42), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 08:00:45,350 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 295 transitions. [2023-11-19 08:00:45,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-11-19 08:00:45,351 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 08:00:45,359 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 08:00:45,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-19 08:00:45,360 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting failErr0ASSERT_VIOLATIONMEMORY_LEAK === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 08:00:45,360 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 08:00:45,360 INFO L85 PathProgramCache]: Analyzing trace with hash -736843367, now seen corresponding path program 1 times [2023-11-19 08:00:45,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 08:00:45,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669983724] [2023-11-19 08:00:45,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:45,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 08:00:45,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:46,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2023-11-19 08:00:46,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:46,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2023-11-19 08:00:46,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:46,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2023-11-19 08:00:46,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:47,019 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 08:00:47,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 08:00:47,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669983724] [2023-11-19 08:00:47,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669983724] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:47,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295396095] [2023-11-19 08:00:47,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 08:00:47,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 08:00:47,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 08:00:47,021 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 08:00:47,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_317fec30-ea20-403f-bef8-f62e42d3bae6/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 08:00:47,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 08:00:47,315 INFO L262 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 65 conjunts are in the unsatisfiable core [2023-11-19 08:00:47,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 08:00:47,600 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-19 08:00:47,770 INFO L349 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2023-11-19 08:00:47,770 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 19 [2023-11-19 08:00:47,835 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2023-11-19 08:00:47,835 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 8 [2023-11-19 08:00:48,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:48,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 08:00:48,279 INFO L349 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-11-19 08:00:48,280 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 31 [2023-11-19 08:00:48,287 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 14 treesize of output 10 [2023-11-19 08:00:48,301 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 08:00:48,301 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 14 treesize of output 8 [2023-11-19 08:00:48,318 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 08:00:48,399 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2023-11-19 08:00:48,406 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 08:00:48,406 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 08:00:48,475 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 10 treesize of output 8 [2023-11-19 08:00:48,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295396095] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 08:00:48,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 08:00:48,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 25] total 36 [2023-11-19 08:00:48,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321405139] [2023-11-19 08:00:48,666 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 08:00:48,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-19 08:00:48,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 08:00:48,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-19 08:00:48,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1280, Unknown=4, NotChecked=0, Total=1406 [2023-11-19 08:00:48,669 INFO L87 Difference]: Start difference. First operand 242 states and 295 transitions. Second operand has 36 states, 35 states have (on average 2.742857142857143) internal successors, (96), 33 states have internal predecessors, (96), 7 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6)