./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b78007c6b6ea6b815e47bde6b36f25c26c431b61fea97b83eeeefa52c8c4206a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 14:09:41,964 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:09:41,967 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:09:42,004 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:09:42,006 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:09:42,010 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:09:42,013 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:09:42,017 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:09:42,019 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:09:42,027 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:09:42,028 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:09:42,030 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:09:42,031 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:09:42,034 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:09:42,035 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:09:42,037 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:09:42,040 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:09:42,041 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:09:42,042 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:09:42,050 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:09:42,054 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:09:42,055 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:09:42,058 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:09:42,059 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:09:42,062 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:09:42,064 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:09:42,065 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:09:42,067 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:09:42,067 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:09:42,069 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:09:42,070 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:09:42,071 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:09:42,073 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:09:42,075 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:09:42,076 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:09:42,076 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:09:42,078 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:09:42,078 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:09:42,078 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:09:42,080 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:09:42,081 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:09:42,082 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-23 14:09:42,123 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:09:42,124 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:09:42,124 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:09:42,125 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:09:42,127 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:09:42,127 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:09:42,127 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:09:42,127 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:09:42,128 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:09:42,128 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:09:42,129 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:09:42,129 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:09:42,130 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:09:42,130 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:09:42,130 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:09:42,130 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:09:42,131 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:09:42,131 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:09:42,131 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-23 14:09:42,132 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-23 14:09:42,132 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:09:42,132 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:09:42,132 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-23 14:09:42,133 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:09:42,133 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:09:42,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:09:42,134 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-23 14:09:42,134 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-23 14:09:42,134 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-23 14:09:42,135 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:09:42,135 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-23 14:09:42,135 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:09:42,136 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:09:42,136 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:09:42,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:09:42,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:09:42,137 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:09:42,137 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:09:42,137 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:09:42,138 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:09:42,138 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:09:42,138 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:09:42,138 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b78007c6b6ea6b815e47bde6b36f25c26c431b61fea97b83eeeefa52c8c4206a [2022-11-23 14:09:42,440 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:09:42,476 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:09:42,479 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:09:42,480 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:09:42,481 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:09:42,482 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2022-11-23 14:09:45,645 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:09:45,890 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:09:45,890 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2022-11-23 14:09:45,902 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/data/c07f77c18/d18d5a0f873d4962801db03e03485278/FLAG46e051096 [2022-11-23 14:09:45,919 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/data/c07f77c18/d18d5a0f873d4962801db03e03485278 [2022-11-23 14:09:45,922 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:09:45,924 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:09:45,926 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:09:45,926 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:09:45,930 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:09:45,931 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:45" (1/1) ... [2022-11-23 14:09:45,932 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53f5829a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:45, skipping insertion in model container [2022-11-23 14:09:45,933 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:45" (1/1) ... [2022-11-23 14:09:45,942 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:09:45,975 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:09:46,328 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:09:46,344 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:09:46,414 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:09:46,447 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:09:46,448 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46 WrapperNode [2022-11-23 14:09:46,448 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:09:46,449 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:09:46,449 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:09:46,449 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:09:46,458 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,486 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,525 INFO L138 Inliner]: procedures = 122, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75 [2022-11-23 14:09:46,526 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:09:46,527 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:09:46,527 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:09:46,527 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:09:46,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,538 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,539 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,545 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,549 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,551 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,552 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,555 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:09:46,556 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:09:46,556 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:09:46,556 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:09:46,557 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (1/1) ... [2022-11-23 14:09:46,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:09:46,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:46,595 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:09:46,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:09:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 14:09:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 14:09:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 14:09:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:09:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 14:09:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:09:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:09:46,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:09:46,796 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:09:46,799 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:09:47,059 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:09:47,096 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:09:47,097 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-23 14:09:47,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:47 BoogieIcfgContainer [2022-11-23 14:09:47,100 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:09:47,103 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:09:47,103 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:09:47,107 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:09:47,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:09:45" (1/3) ... [2022-11-23 14:09:47,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c14805c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:47, skipping insertion in model container [2022-11-23 14:09:47,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:46" (2/3) ... [2022-11-23 14:09:47,109 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c14805c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:47, skipping insertion in model container [2022-11-23 14:09:47,109 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:47" (3/3) ... [2022-11-23 14:09:47,111 INFO L112 eAbstractionObserver]: Analyzing ICFG 960521-1_1-3.i [2022-11-23 14:09:47,133 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:09:47,133 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2022-11-23 14:09:47,184 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:09:47,191 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=FINITE_AUTOMATA, 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;@2e47c41c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:09:47,191 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2022-11-23 14:09:47,196 INFO L276 IsEmpty]: Start isEmpty. Operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 states have internal predecessors, (51), 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) [2022-11-23 14:09:47,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-23 14:09:47,203 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:47,203 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-23 14:09:47,204 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:47,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:47,215 INFO L85 PathProgramCache]: Analyzing trace with hash 3797425, now seen corresponding path program 1 times [2022-11-23 14:09:47,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:47,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582126385] [2022-11-23 14:09:47,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:47,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:47,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:47,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:47,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582126385] [2022-11-23 14:09:47,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582126385] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:47,424 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:47,424 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:09:47,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735709842] [2022-11-23 14:09:47,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:47,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-23 14:09:47,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:47,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-23 14:09:47,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-23 14:09:47,483 INFO L87 Difference]: Start difference. First operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 states have internal predecessors, (51), 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) 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) [2022-11-23 14:09:47,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:47,561 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2022-11-23 14:09:47,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-23 14:09:47,564 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 [2022-11-23 14:09:47,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:47,573 INFO L225 Difference]: With dead ends: 47 [2022-11-23 14:09:47,573 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 14:09:47,575 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 [2022-11-23 14:09:47,579 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:47,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 43 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:47,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 14:09:47,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-23 14:09:47,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.96) internal successors, (49), 45 states have internal predecessors, (49), 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) [2022-11-23 14:09:47,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-11-23 14:09:47,629 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 4 [2022-11-23 14:09:47,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:47,630 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-11-23 14:09:47,630 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) [2022-11-23 14:09:47,630 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-11-23 14:09:47,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-23 14:09:47,631 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:47,631 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-23 14:09:47,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:09:47,633 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:47,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:47,634 INFO L85 PathProgramCache]: Analyzing trace with hash 117505828, now seen corresponding path program 1 times [2022-11-23 14:09:47,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:47,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034015661] [2022-11-23 14:09:47,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:47,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:47,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:47,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:47,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:47,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034015661] [2022-11-23 14:09:47,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034015661] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:47,796 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:47,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:09:47,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251408584] [2022-11-23 14:09:47,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:47,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:09:47,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:47,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:09:47,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:09:47,799 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 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) [2022-11-23 14:09:47,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:47,864 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2022-11-23 14:09:47,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:09:47,865 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), 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 5 [2022-11-23 14:09:47,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:47,866 INFO L225 Difference]: With dead ends: 45 [2022-11-23 14:09:47,866 INFO L226 Difference]: Without dead ends: 45 [2022-11-23 14:09:47,866 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 [2022-11-23 14:09:47,867 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 1 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:47,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 68 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:47,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-23 14:09:47,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-23 14:09:47,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 25 states have (on average 1.92) internal successors, (48), 44 states have internal predecessors, (48), 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) [2022-11-23 14:09:47,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2022-11-23 14:09:47,875 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 5 [2022-11-23 14:09:47,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:47,875 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2022-11-23 14:09:47,876 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), 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) [2022-11-23 14:09:47,876 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2022-11-23 14:09:47,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-23 14:09:47,876 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:47,876 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-23 14:09:47,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:09:47,877 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:47,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:47,878 INFO L85 PathProgramCache]: Analyzing trace with hash 117505829, now seen corresponding path program 1 times [2022-11-23 14:09:47,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:47,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150923270] [2022-11-23 14:09:47,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:47,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:47,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:48,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:48,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:48,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150923270] [2022-11-23 14:09:48,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150923270] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:48,152 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:48,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:09:48,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960099606] [2022-11-23 14:09:48,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:48,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:09:48,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:48,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:09:48,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:48,154 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2022-11-23 14:09:48,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:48,243 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2022-11-23 14:09:48,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:09:48,244 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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 5 [2022-11-23 14:09:48,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:48,245 INFO L225 Difference]: With dead ends: 88 [2022-11-23 14:09:48,245 INFO L226 Difference]: Without dead ends: 88 [2022-11-23 14:09:48,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:09:48,247 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 43 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:48,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 106 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:48,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-23 14:09:48,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 49. [2022-11-23 14:09:48,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 48 states have internal predecessors, (53), 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) [2022-11-23 14:09:48,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-11-23 14:09:48,258 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 5 [2022-11-23 14:09:48,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:48,259 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-11-23 14:09:48,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 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) [2022-11-23 14:09:48,259 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-11-23 14:09:48,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:09:48,260 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:48,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:48,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 14:09:48,261 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:48,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:48,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1254025907, now seen corresponding path program 1 times [2022-11-23 14:09:48,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:48,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554475179] [2022-11-23 14:09:48,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:48,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:48,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:48,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:48,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:48,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554475179] [2022-11-23 14:09:48,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554475179] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:48,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:48,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:09:48,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552949360] [2022-11-23 14:09:48,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:48,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:09:48,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:48,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:09:48,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:48,450 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:48,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:48,528 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-11-23 14:09:48,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:09:48,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:09:48,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:48,530 INFO L225 Difference]: With dead ends: 46 [2022-11-23 14:09:48,530 INFO L226 Difference]: Without dead ends: 46 [2022-11-23 14:09:48,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:48,531 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 24 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:48,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 53 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:48,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-23 14:09:48,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-23 14:09:48,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 45 states have internal predecessors, (50), 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) [2022-11-23 14:09:48,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-11-23 14:09:48,537 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 7 [2022-11-23 14:09:48,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:48,537 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-11-23 14:09:48,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:48,537 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-11-23 14:09:48,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:09:48,538 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:48,538 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:48,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 14:09:48,539 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:48,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:48,539 INFO L85 PathProgramCache]: Analyzing trace with hash 1254025908, now seen corresponding path program 1 times [2022-11-23 14:09:48,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:48,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050851168] [2022-11-23 14:09:48,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:48,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:48,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:48,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:48,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:48,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050851168] [2022-11-23 14:09:48,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2050851168] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:48,749 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:48,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:09:48,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673924825] [2022-11-23 14:09:48,749 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:48,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:09:48,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:48,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:09:48,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:09:48,751 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:48,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:48,876 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2022-11-23 14:09:48,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:09:48,877 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:09:48,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:48,877 INFO L225 Difference]: With dead ends: 79 [2022-11-23 14:09:48,877 INFO L226 Difference]: Without dead ends: 79 [2022-11-23 14:09:48,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:09:48,879 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 33 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:48,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 84 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:48,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-23 14:09:48,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 53. [2022-11-23 14:09:48,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 52 states have internal predecessors, (62), 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) [2022-11-23 14:09:48,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2022-11-23 14:09:48,886 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 7 [2022-11-23 14:09:48,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:48,886 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2022-11-23 14:09:48,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:48,887 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2022-11-23 14:09:48,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-23 14:09:48,888 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:48,888 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2022-11-23 14:09:48,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 14:09:48,888 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:48,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:48,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1255522762, now seen corresponding path program 1 times [2022-11-23 14:09:48,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:48,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293030610] [2022-11-23 14:09:48,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:48,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:48,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:49,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:49,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:49,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293030610] [2022-11-23 14:09:49,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293030610] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:49,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166881921] [2022-11-23 14:09:49,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:49,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:49,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:49,095 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:49,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:09:49,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:49,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 14:09:49,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:49,332 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:09:49,333 INFO L350 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 15 [2022-11-23 14:09:49,343 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:49,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:09:49,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:49,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166881921] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:09:49,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1409717725] [2022-11-23 14:09:49,437 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2022-11-23 14:09:49,438 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:09:49,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:09:49,451 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:09:49,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:09:49,842 INFO L321 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-11-23 14:09:49,843 INFO L350 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 3 case distinctions, treesize of input 24 treesize of output 21 [2022-11-23 14:09:49,858 INFO L350 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 17 treesize of output 19 [2022-11-23 14:09:49,892 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:09:50,333 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '659#(and (< (select |#length| |ULTIMATE.start_main_#t~post9#1.base|) (+ 4 |ULTIMATE.start_main_#t~post9#1.offset|)) (< ~a~0.base |#StackHeapBarrier|) (< |ULTIMATE.start_main_#t~post9#1.base| |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_main_#t~post9#1.base|) 1) (= |ULTIMATE.start_main_#t~post9#1.base| ~b~0.base) (not (= ~a~0.base 0)) (not (= |ULTIMATE.start_main_#t~post9#1.base| 0)) (not (= |ULTIMATE.start_main_#t~post9#1.base| ~a~0.base)) (= |ULTIMATE.start_main_#t~post9#1.offset| 0) (= ~b~0.offset (+ 4 |ULTIMATE.start_main_#t~post9#1.offset|)) (= (select |#valid| ~a~0.base) 1) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 1 ~n~0) (= (* (mod ~n~0 1073741824) 4) (select |#length| |ULTIMATE.start_main_#t~post9#1.base|)) (= (* (mod ~n~0 1073741824) 4) (select |#length| ~a~0.base)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 14:09:50,333 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:09:50,333 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:09:50,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2022-11-23 14:09:50,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850259635] [2022-11-23 14:09:50,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:09:50,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-23 14:09:50,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:50,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-23 14:09:50,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2022-11-23 14:09:50,336 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 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) [2022-11-23 14:09:50,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:50,571 INFO L93 Difference]: Finished difference Result 142 states and 166 transitions. [2022-11-23 14:09:50,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:09:50,575 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-23 14:09:50,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:50,576 INFO L225 Difference]: With dead ends: 142 [2022-11-23 14:09:50,576 INFO L226 Difference]: Without dead ends: 142 [2022-11-23 14:09:50,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:09:50,578 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 324 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:50,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 223 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:50,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-11-23 14:09:50,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 48. [2022-11-23 14:09:50,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.75) internal successors, (56), 47 states have internal predecessors, (56), 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) [2022-11-23 14:09:50,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2022-11-23 14:09:50,591 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 7 [2022-11-23 14:09:50,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:50,592 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2022-11-23 14:09:50,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 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) [2022-11-23 14:09:50,592 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2022-11-23 14:09:50,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:09:50,593 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:50,593 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:50,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:50,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:50,794 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:50,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:50,794 INFO L85 PathProgramCache]: Analyzing trace with hash 220169801, now seen corresponding path program 1 times [2022-11-23 14:09:50,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:50,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104880898] [2022-11-23 14:09:50,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:50,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:50,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:50,844 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:50,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:50,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104880898] [2022-11-23 14:09:50,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104880898] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:50,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:50,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:09:50,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950561772] [2022-11-23 14:09:50,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:50,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:09:50,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:50,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:09:50,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:50,848 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-11-23 14:09:50,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:50,891 INFO L93 Difference]: Finished difference Result 87 states and 97 transitions. [2022-11-23 14:09:50,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:09:50,892 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 8 [2022-11-23 14:09:50,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:50,894 INFO L225 Difference]: With dead ends: 87 [2022-11-23 14:09:50,894 INFO L226 Difference]: Without dead ends: 87 [2022-11-23 14:09:50,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:50,897 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 36 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:50,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 98 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:50,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-23 14:09:50,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 57. [2022-11-23 14:09:50,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 56 states have internal predecessors, (68), 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) [2022-11-23 14:09:50,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2022-11-23 14:09:50,921 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 8 [2022-11-23 14:09:50,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:50,921 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2022-11-23 14:09:50,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2022-11-23 14:09:50,922 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2022-11-23 14:09:50,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 14:09:50,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:50,927 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:50,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-23 14:09:50,927 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:50,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:50,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1766851146, now seen corresponding path program 1 times [2022-11-23 14:09:50,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:50,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933134598] [2022-11-23 14:09:50,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:50,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:50,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,005 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:51,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:51,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933134598] [2022-11-23 14:09:51,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933134598] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:51,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436346358] [2022-11-23 14:09:51,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:51,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:51,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:51,011 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:51,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:09:51,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:09:51,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:51,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:51,147 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:09:51,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436346358] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:51,148 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:09:51,148 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 7 [2022-11-23 14:09:51,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481971602] [2022-11-23 14:09:51,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:51,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:09:51,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:51,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:09:51,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:09:51,150 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:51,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:51,185 INFO L93 Difference]: Finished difference Result 85 states and 94 transitions. [2022-11-23 14:09:51,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:09:51,186 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 14:09:51,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:51,187 INFO L225 Difference]: With dead ends: 85 [2022-11-23 14:09:51,187 INFO L226 Difference]: Without dead ends: 85 [2022-11-23 14:09:51,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:09:51,188 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 64 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:51,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 97 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:51,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-23 14:09:51,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 56. [2022-11-23 14:09:51,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 40 states have (on average 1.625) internal successors, (65), 55 states have internal predecessors, (65), 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) [2022-11-23 14:09:51,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2022-11-23 14:09:51,193 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 9 [2022-11-23 14:09:51,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:51,193 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2022-11-23 14:09:51,194 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:09:51,194 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2022-11-23 14:09:51,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:09:51,195 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:51,195 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:51,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:51,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:51,401 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:51,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:51,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1062261639, now seen corresponding path program 1 times [2022-11-23 14:09:51,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:51,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314363437] [2022-11-23 14:09:51,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:51,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:51,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:09:51,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:51,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314363437] [2022-11-23 14:09:51,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314363437] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:51,464 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:51,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:09:51,465 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756272286] [2022-11-23 14:09:51,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:51,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:09:51,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:51,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:09:51,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:51,467 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:51,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:51,526 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2022-11-23 14:09:51,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:09:51,526 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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 10 [2022-11-23 14:09:51,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:51,527 INFO L225 Difference]: With dead ends: 54 [2022-11-23 14:09:51,527 INFO L226 Difference]: Without dead ends: 54 [2022-11-23 14:09:51,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:09:51,530 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 16 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:51,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 60 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:51,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-23 14:09:51,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-11-23 14:09:51,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.55) internal successors, (62), 53 states have internal predecessors, (62), 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) [2022-11-23 14:09:51,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 62 transitions. [2022-11-23 14:09:51,540 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 62 transitions. Word has length 10 [2022-11-23 14:09:51,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:51,541 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 62 transitions. [2022-11-23 14:09:51,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:51,541 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 62 transitions. [2022-11-23 14:09:51,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:09:51,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:51,543 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:51,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 14:09:51,543 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:51,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:51,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1062261640, now seen corresponding path program 1 times [2022-11-23 14:09:51,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:51,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886387950] [2022-11-23 14:09:51,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:51,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:51,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:09:51,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:51,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886387950] [2022-11-23 14:09:51,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886387950] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:51,697 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:51,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:09:51,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283486230] [2022-11-23 14:09:51,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:51,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:09:51,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:51,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:09:51,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:51,700 INFO L87 Difference]: Start difference. First operand 54 states and 62 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:51,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:51,729 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2022-11-23 14:09:51,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:09:51,730 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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 10 [2022-11-23 14:09:51,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:51,730 INFO L225 Difference]: With dead ends: 42 [2022-11-23 14:09:51,731 INFO L226 Difference]: Without dead ends: 42 [2022-11-23 14:09:51,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:09:51,732 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 19 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:51,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 38 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:51,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-23 14:09:51,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-23 14:09:51,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 34 states have (on average 1.411764705882353) internal successors, (48), 41 states have internal predecessors, (48), 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) [2022-11-23 14:09:51,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2022-11-23 14:09:51,743 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 10 [2022-11-23 14:09:51,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:51,744 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2022-11-23 14:09:51,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:51,744 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2022-11-23 14:09:51,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 14:09:51,745 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:51,745 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:51,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-23 14:09:51,746 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:51,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:51,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1589215502, now seen corresponding path program 1 times [2022-11-23 14:09:51,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:51,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364867911] [2022-11-23 14:09:51,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:51,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:51,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:51,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:51,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364867911] [2022-11-23 14:09:51,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364867911] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:51,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934285360] [2022-11-23 14:09:51,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:51,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:51,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:51,842 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:51,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:09:51,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:51,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-23 14:09:51,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:51,963 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:51,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:09:51,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934285360] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:51,964 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:09:51,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2022-11-23 14:09:51,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589955641] [2022-11-23 14:09:51,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:51,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:09:51,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:51,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:09:51,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:09:51,966 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:52,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:52,020 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2022-11-23 14:09:52,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:09:52,020 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 10 [2022-11-23 14:09:52,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:52,021 INFO L225 Difference]: With dead ends: 56 [2022-11-23 14:09:52,022 INFO L226 Difference]: Without dead ends: 56 [2022-11-23 14:09:52,022 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:09:52,023 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 61 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:52,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 65 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:52,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-23 14:09:52,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 38. [2022-11-23 14:09:52,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 30 states have (on average 1.3666666666666667) internal successors, (41), 37 states have internal predecessors, (41), 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) [2022-11-23 14:09:52,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-11-23 14:09:52,038 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 10 [2022-11-23 14:09:52,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:52,039 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-11-23 14:09:52,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2022-11-23 14:09:52,039 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-11-23 14:09:52,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-23 14:09:52,040 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:52,040 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:52,051 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:52,246 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 14:09:52,246 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:52,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:52,247 INFO L85 PathProgramCache]: Analyzing trace with hash -2023168549, now seen corresponding path program 1 times [2022-11-23 14:09:52,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:52,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027902709] [2022-11-23 14:09:52,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:52,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:52,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:52,596 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:52,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:52,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027902709] [2022-11-23 14:09:52,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027902709] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:52,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [584201920] [2022-11-23 14:09:52,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:52,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:52,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:52,599 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:52,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:09:52,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:52,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:09:52,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:52,727 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 14:09:52,727 INFO L350 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 [2022-11-23 14:09:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:52,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:09:53,043 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:53,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [584201920] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:09:53,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1678918369] [2022-11-23 14:09:53,045 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:09:53,046 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:09:53,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:09:53,046 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:09:53,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:09:53,202 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:09:53,202 INFO L350 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 1 case distinctions, treesize of input 17 treesize of output 19 [2022-11-23 14:09:53,227 INFO L321 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-11-23 14:09:53,228 INFO L350 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 3 case distinctions, treesize of input 24 treesize of output 21 [2022-11-23 14:09:53,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 13 treesize of output 9 [2022-11-23 14:09:53,281 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 21 treesize of output 22 [2022-11-23 14:09:53,370 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:09:53,397 INFO L321 Elim1Store]: treesize reduction 60, result has 27.7 percent of original size [2022-11-23 14:09:53,398 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 186 treesize of output 190 [2022-11-23 14:09:53,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-23 14:09:53,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-23 14:09:53,554 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:09:54,327 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1590#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 1 ~n~0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-23 14:09:54,327 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:09:54,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:09:54,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 15 [2022-11-23 14:09:54,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435883272] [2022-11-23 14:09:54,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:09:54,328 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 14:09:54,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:54,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 14:09:54,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-11-23 14:09:54,329 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 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) [2022-11-23 14:09:54,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:54,882 INFO L93 Difference]: Finished difference Result 87 states and 91 transitions. [2022-11-23 14:09:54,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:09:54,883 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 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 11 [2022-11-23 14:09:54,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:54,883 INFO L225 Difference]: With dead ends: 87 [2022-11-23 14:09:54,883 INFO L226 Difference]: Without dead ends: 87 [2022-11-23 14:09:54,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=135, Invalid=677, Unknown=0, NotChecked=0, Total=812 [2022-11-23 14:09:54,884 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 221 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:54,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 101 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:09:54,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-23 14:09:54,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 40. [2022-11-23 14:09:54,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 32 states have (on average 1.34375) internal successors, (43), 39 states have internal predecessors, (43), 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) [2022-11-23 14:09:54,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-23 14:09:54,887 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 11 [2022-11-23 14:09:54,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:54,887 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-23 14:09:54,887 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 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) [2022-11-23 14:09:54,888 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-23 14:09:54,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-23 14:09:54,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:54,889 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:54,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:55,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:55,090 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:55,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:55,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1368779961, now seen corresponding path program 1 times [2022-11-23 14:09:55,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:55,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78060573] [2022-11-23 14:09:55,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:55,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:55,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:55,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:09:55,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:55,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78060573] [2022-11-23 14:09:55,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78060573] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:55,118 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:55,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:09:55,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743051945] [2022-11-23 14:09:55,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:55,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:09:55,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:55,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:09:55,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:09:55,120 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-11-23 14:09:55,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:55,136 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2022-11-23 14:09:55,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:09:55,136 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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 12 [2022-11-23 14:09:55,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:55,137 INFO L225 Difference]: With dead ends: 38 [2022-11-23 14:09:55,137 INFO L226 Difference]: Without dead ends: 38 [2022-11-23 14:09:55,138 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 [2022-11-23 14:09:55,138 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 18 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:55,139 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:55,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-23 14:09:55,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-23 14:09:55,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.28125) internal successors, (41), 37 states have internal predecessors, (41), 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) [2022-11-23 14:09:55,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-11-23 14:09:55,141 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 12 [2022-11-23 14:09:55,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:55,142 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-11-23 14:09:55,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2022-11-23 14:09:55,142 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-11-23 14:09:55,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:09:55,143 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:55,143 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:55,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-23 14:09:55,143 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:55,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:55,144 INFO L85 PathProgramCache]: Analyzing trace with hash 517494277, now seen corresponding path program 1 times [2022-11-23 14:09:55,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:55,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010974039] [2022-11-23 14:09:55,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:55,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:55,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:55,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:09:55,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:55,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010974039] [2022-11-23 14:09:55,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010974039] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:09:55,171 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:09:55,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:09:55,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173328351] [2022-11-23 14:09:55,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:55,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:09:55,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:55,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:09:55,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:09:55,173 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 3 states, 2 states have (on average 6.5) internal successors, (13), 3 states have internal predecessors, (13), 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) [2022-11-23 14:09:55,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:55,192 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2022-11-23 14:09:55,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:09:55,193 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.5) internal successors, (13), 3 states have internal predecessors, (13), 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 13 [2022-11-23 14:09:55,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:55,193 INFO L225 Difference]: With dead ends: 36 [2022-11-23 14:09:55,193 INFO L226 Difference]: Without dead ends: 36 [2022-11-23 14:09:55,194 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 [2022-11-23 14:09:55,194 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:55,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:09:55,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-23 14:09:55,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-23 14:09:55,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.21875) internal successors, (39), 35 states have internal predecessors, (39), 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) [2022-11-23 14:09:55,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2022-11-23 14:09:55,197 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 13 [2022-11-23 14:09:55,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:55,197 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2022-11-23 14:09:55,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.5) internal successors, (13), 3 states have internal predecessors, (13), 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) [2022-11-23 14:09:55,198 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2022-11-23 14:09:55,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:09:55,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:55,205 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:55,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-23 14:09:55,205 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:55,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:55,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1355270941, now seen corresponding path program 2 times [2022-11-23 14:09:55,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:55,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801803749] [2022-11-23 14:09:55,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:55,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:55,292 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:09:55,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:55,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801803749] [2022-11-23 14:09:55,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801803749] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:55,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501208125] [2022-11-23 14:09:55,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:09:55,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:55,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:55,295 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:55,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:09:55,379 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:09:55,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:09:55,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:09:55,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:55,422 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:09:55,422 INFO L350 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 17 treesize of output 19 [2022-11-23 14:09:55,546 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:09:55,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:09:55,722 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:09:55,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501208125] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:09:55,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000284337] [2022-11-23 14:09:55,728 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-23 14:09:55,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:09:55,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:09:55,730 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:09:55,731 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:09:55,895 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:09:55,896 INFO L350 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 1 case distinctions, treesize of input 17 treesize of output 19 [2022-11-23 14:09:55,918 INFO L321 Elim1Store]: treesize reduction 23, result has 17.9 percent of original size [2022-11-23 14:09:55,919 INFO L350 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 3 case distinctions, treesize of input 24 treesize of output 21 [2022-11-23 14:09:55,941 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 13 treesize of output 9 [2022-11-23 14:09:55,967 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 26 treesize of output 27 [2022-11-23 14:09:56,072 INFO L321 Elim1Store]: treesize reduction 55, result has 14.1 percent of original size [2022-11-23 14:09:56,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 191 treesize of output 189 [2022-11-23 14:09:56,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-23 14:09:56,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2022-11-23 14:09:56,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:09:56,813 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1976#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 1 ~n~0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0))' at error location [2022-11-23 14:09:56,813 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:09:56,814 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:09:56,814 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 15 [2022-11-23 14:09:56,814 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145573703] [2022-11-23 14:09:56,814 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:09:56,814 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:09:56,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:56,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:09:56,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-23 14:09:56,815 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 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) [2022-11-23 14:09:57,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:57,457 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2022-11-23 14:09:57,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 14:09:57,458 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 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 13 [2022-11-23 14:09:57,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:57,459 INFO L225 Difference]: With dead ends: 72 [2022-11-23 14:09:57,459 INFO L226 Difference]: Without dead ends: 72 [2022-11-23 14:09:57,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=198, Invalid=858, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:09:57,460 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 149 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:57,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 82 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:09:57,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-23 14:09:57,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 45. [2022-11-23 14:09:57,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 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) [2022-11-23 14:09:57,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2022-11-23 14:09:57,463 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 13 [2022-11-23 14:09:57,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:57,464 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2022-11-23 14:09:57,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 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) [2022-11-23 14:09:57,464 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2022-11-23 14:09:57,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-23 14:09:57,465 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:57,465 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:57,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:57,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-23 14:09:57,666 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:57,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:57,666 INFO L85 PathProgramCache]: Analyzing trace with hash -936203154, now seen corresponding path program 1 times [2022-11-23 14:09:57,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:57,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868933089] [2022-11-23 14:09:57,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:57,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:57,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:57,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:09:57,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:09:57,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868933089] [2022-11-23 14:09:57,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868933089] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:57,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672518428] [2022-11-23 14:09:57,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:57,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:09:57,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:09:57,983 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:09:58,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:09:58,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:09:58,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 14:09:58,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:09:58,077 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:09:58,077 INFO L350 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 17 treesize of output 19 [2022-11-23 14:09:58,543 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:09:58,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:09:58,771 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:09:58,771 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672518428] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-23 14:09:58,771 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:09:58,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 6] total 17 [2022-11-23 14:09:58,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83883245] [2022-11-23 14:09:58,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:09:58,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:09:58,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:09:58,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:09:58,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2022-11-23 14:09:58,773 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-23 14:09:58,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:09:58,937 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2022-11-23 14:09:58,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:09:58,937 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 7 states have internal predecessors, (13), 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 14 [2022-11-23 14:09:58,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:09:58,938 INFO L225 Difference]: With dead ends: 60 [2022-11-23 14:09:58,938 INFO L226 Difference]: Without dead ends: 60 [2022-11-23 14:09:58,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:09:58,939 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 72 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:09:58,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 35 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:09:58,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-23 14:09:58,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 46. [2022-11-23 14:09:58,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 43 states have (on average 1.1627906976744187) internal successors, (50), 45 states have internal predecessors, (50), 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) [2022-11-23 14:09:58,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2022-11-23 14:09:58,941 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 14 [2022-11-23 14:09:58,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:09:58,942 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2022-11-23 14:09:58,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-23 14:09:58,942 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2022-11-23 14:09:58,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:09:58,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:09:58,942 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:58,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:09:59,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 14:09:59,155 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-23 14:09:59,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:09:59,156 INFO L85 PathProgramCache]: Analyzing trace with hash -904202617, now seen corresponding path program 1 times [2022-11-23 14:09:59,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:09:59,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309830949] [2022-11-23 14:09:59,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:09:59,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:09:59,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-23 14:09:59,187 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-11-23 14:09:59,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-23 14:09:59,227 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-11-23 14:09:59,227 INFO L359 BasicCegarLoop]: Counterexample is feasible [2022-11-23 14:09:59,229 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE (20 of 21 remaining) [2022-11-23 14:09:59,233 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (19 of 21 remaining) [2022-11-23 14:09:59,234 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (18 of 21 remaining) [2022-11-23 14:09:59,234 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 21 remaining) [2022-11-23 14:09:59,234 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 21 remaining) [2022-11-23 14:09:59,235 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 21 remaining) [2022-11-23 14:09:59,235 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 21 remaining) [2022-11-23 14:09:59,235 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 21 remaining) [2022-11-23 14:09:59,235 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 21 remaining) [2022-11-23 14:09:59,236 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE (11 of 21 remaining) [2022-11-23 14:09:59,236 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_FREE (10 of 21 remaining) [2022-11-23 14:09:59,236 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE (9 of 21 remaining) [2022-11-23 14:09:59,236 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE (8 of 21 remaining) [2022-11-23 14:09:59,237 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE (7 of 21 remaining) [2022-11-23 14:09:59,237 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE (6 of 21 remaining) [2022-11-23 14:09:59,237 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE (5 of 21 remaining) [2022-11-23 14:09:59,237 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE (4 of 21 remaining) [2022-11-23 14:09:59,238 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE (3 of 21 remaining) [2022-11-23 14:09:59,238 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_FREE (2 of 21 remaining) [2022-11-23 14:09:59,238 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr19ASSERT_VIOLATIONMEMORY_FREE (1 of 21 remaining) [2022-11-23 14:09:59,238 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_LEAK (0 of 21 remaining) [2022-11-23 14:09:59,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-23 14:09:59,243 INFO L444 BasicCegarLoop]: Path program histogram: [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:09:59,249 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-23 14:09:59,290 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 02:09:59 BoogieIcfgContainer [2022-11-23 14:09:59,291 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-23 14:09:59,291 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-23 14:09:59,291 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-23 14:09:59,292 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-23 14:09:59,292 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:47" (3/4) ... [2022-11-23 14:09:59,294 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-11-23 14:09:59,360 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/witness.graphml [2022-11-23 14:09:59,360 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-23 14:09:59,361 INFO L158 Benchmark]: Toolchain (without parser) took 13437.31ms. Allocated memory was 178.3MB in the beginning and 257.9MB in the end (delta: 79.7MB). Free memory was 130.9MB in the beginning and 98.5MB in the end (delta: 32.3MB). Peak memory consumption was 115.2MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,361 INFO L158 Benchmark]: CDTParser took 0.22ms. Allocated memory is still 142.6MB. Free memory is still 83.6MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-23 14:09:59,362 INFO L158 Benchmark]: CACSL2BoogieTranslator took 522.68ms. Allocated memory is still 178.3MB. Free memory was 130.3MB in the beginning and 114.1MB in the end (delta: 16.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,362 INFO L158 Benchmark]: Boogie Procedure Inliner took 77.18ms. Allocated memory is still 178.3MB. Free memory was 114.1MB in the beginning and 112.3MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,363 INFO L158 Benchmark]: Boogie Preprocessor took 28.49ms. Allocated memory is still 178.3MB. Free memory was 112.3MB in the beginning and 110.4MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,363 INFO L158 Benchmark]: RCFGBuilder took 544.18ms. Allocated memory is still 178.3MB. Free memory was 110.4MB in the beginning and 95.2MB in the end (delta: 15.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,364 INFO L158 Benchmark]: TraceAbstraction took 12187.72ms. Allocated memory was 178.3MB in the beginning and 257.9MB in the end (delta: 79.7MB). Free memory was 94.7MB in the beginning and 100.6MB in the end (delta: -6.0MB). Peak memory consumption was 75.3MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,365 INFO L158 Benchmark]: Witness Printer took 69.15ms. Allocated memory is still 257.9MB. Free memory was 100.6MB in the beginning and 98.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-23 14:09:59,368 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22ms. Allocated memory is still 142.6MB. Free memory is still 83.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 522.68ms. Allocated memory is still 178.3MB. Free memory was 130.3MB in the beginning and 114.1MB in the end (delta: 16.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 77.18ms. Allocated memory is still 178.3MB. Free memory was 114.1MB in the beginning and 112.3MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 28.49ms. Allocated memory is still 178.3MB. Free memory was 112.3MB in the beginning and 110.4MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 544.18ms. Allocated memory is still 178.3MB. Free memory was 110.4MB in the beginning and 95.2MB in the end (delta: 15.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 12187.72ms. Allocated memory was 178.3MB in the beginning and 257.9MB in the end (delta: 79.7MB). Free memory was 94.7MB in the beginning and 100.6MB in the end (delta: -6.0MB). Peak memory consumption was 75.3MB. Max. memory is 16.1GB. * Witness Printer took 69.15ms. Allocated memory is still 257.9MB. Free memory was 100.6MB in the beginning and 98.5MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 547]: free of unallocated memory possible free of unallocated memory possible We found a FailurePath: [L523] int *a, *b; [L524] int n; [L536] n = 1 VAL [a={0:0}, b={0:0}, n=1] [L537] COND FALSE !(__VERIFIER_nondet_int() && n < 30) [L540] a = malloc(n * sizeof(*a)) [L541] b = malloc(n * sizeof(*b)) [L542] EXPR b++ VAL [a={-3:0}, b={-2:4}, b++={-2:0}, n=1] [L542] *b++ = 0 [L543] CALL foo() [L528] int i; [L529] i = 0 VAL [a={-3:0}, b={-2:4}, i=0, n=1] [L529] COND TRUE i < n VAL [a={-3:0}, b={-2:4}, i=0, n=1] [L530] a[i] = -1 [L529] i++ VAL [a={-3:0}, b={-2:4}, i=1, n=1] [L529] COND FALSE !(i < n) [L531] i = 0 VAL [a={-3:0}, b={-2:4}, i=0, n=1] [L531] COND FALSE !(i < n - 1) [L543] RET foo() [L544] b[-1] VAL [a={-3:0}, b={-2:4}, b[-1]=0, n=1] [L544] COND FALSE !(b[-1]) [L547] free(a) VAL [a={-3:0}, b={-2:4}, n=1] [L547] free(a) VAL [a={-3:0}, b={-2:4}, n=1] [L547] free(a) [L547] free(b) VAL [a={-3:0}, b={-2:4}, n=1] - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: -1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 534]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 47 locations, 21 error locations. Started 1 CEGAR loops. OverallTime: 12.1s, OverallIterations: 17, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 1096 SdHoareTripleChecker+Valid, 1.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1096 mSDsluCounter, 1184 SdHoareTripleChecker+Invalid, 1.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 717 mSDsCounter, 59 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1182 IncrementalHoareTripleChecker+Invalid, 1241 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 59 mSolverCounterUnsat, 467 mSDtfsCounter, 1182 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 211 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 3.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=57occurred in iteration=7, InterpolantAutomatonStates: 89, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 16 MinimizatonAttempts, 324 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.7s InterpolantComputationTime, 224 NumberOfCodeBlocks, 222 NumberOfCodeBlocksAsserted, 24 NumberOfCheckSat, 228 ConstructedInterpolants, 3 QuantifiedInterpolants, 2223 SizeOfPredicates, 17 NumberOfNonLiveVariables, 530 ConjunctsInSsa, 68 ConjunctsInUnsatCore, 26 InterpolantComputations, 13 PerfectInterpolantSequences, 32/72 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-11-23 14:09:59,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2afda31-e8dc-47be-9ff0-3d7d5a0a6f39/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-free)