./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 8393723b 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_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS --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 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 --- 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-8393723 [2022-11-19 07:11:46,773 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:11:46,776 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:11:46,805 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:11:46,806 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:11:46,807 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:11:46,809 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:11:46,811 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:11:46,813 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:11:46,814 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:11:46,824 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:11:46,829 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:11:46,829 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:11:46,836 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:11:46,839 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:11:46,842 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:11:46,845 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:11:46,847 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:11:46,850 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:11:46,856 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:11:46,858 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:11:46,860 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:11:46,865 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:11:46,866 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:11:46,873 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:11:46,878 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:11:46,879 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:11:46,880 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:11:46,882 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:11:46,883 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:11:46,884 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:11:46,886 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:11:46,887 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:11:46,888 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:11:46,890 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:11:46,890 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:11:46,891 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:11:46,891 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:11:46,891 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:11:46,892 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:11:46,892 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:11:46,895 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-19 07:11:46,936 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:11:46,940 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:11:46,941 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:11:46,941 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:11:46,942 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:11:46,943 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:11:46,943 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:11:46,943 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:11:46,943 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:11:46,944 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:11:46,945 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:11:46,945 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:11:46,945 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:11:46,945 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:11:46,946 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:11:46,946 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:11:46,946 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:11:46,946 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:11:46,947 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-19 07:11:46,947 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-19 07:11:46,948 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:11:46,948 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:11:46,948 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-19 07:11:46,948 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:11:46,949 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:11:46,949 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:11:46,949 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-19 07:11:46,949 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-19 07:11:46,949 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-19 07:11:46,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:11:46,950 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-19 07:11:46,950 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:11:46,951 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:11:46,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:11:46,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:11:46,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:11:46,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:11:46,952 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:11:46,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:11:46,952 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:11:46,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:11:46,953 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:11:46,953 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_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 [2022-11-19 07:11:47,309 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:11:47,345 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:11:47,348 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:11:47,350 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:11:47,351 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:11:47,353 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/memsafety/960521-1-2.i [2022-11-19 07:11:47,443 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/data/188629cdd/701f27e88ca048f0889201fadd15574d/FLAG10870d752 [2022-11-19 07:11:48,014 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:11:48,025 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/sv-benchmarks/c/memsafety/960521-1-2.i [2022-11-19 07:11:48,046 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/data/188629cdd/701f27e88ca048f0889201fadd15574d/FLAG10870d752 [2022-11-19 07:11:48,285 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/data/188629cdd/701f27e88ca048f0889201fadd15574d [2022-11-19 07:11:48,288 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:11:48,290 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:11:48,299 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:11:48,299 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:11:48,304 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:11:48,305 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:48,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@426470eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48, skipping insertion in model container [2022-11-19 07:11:48,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:48,317 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:11:48,352 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:11:48,796 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:11:48,809 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:11:48,874 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:11:48,909 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:11:48,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48 WrapperNode [2022-11-19 07:11:48,909 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:11:48,911 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:11:48,911 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:11:48,911 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:11:48,920 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:48,955 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:48,986 INFO L138 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2022-11-19 07:11:48,987 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:11:48,988 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:11:48,989 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:11:48,989 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:11:49,000 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,001 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,011 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,012 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,024 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,035 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,041 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,048 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:11:49,051 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:11:49,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:11:49,052 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:11:49,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (1/1) ... [2022-11-19 07:11:49,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:11:49,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:49,086 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:11:49,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:11:49,128 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 07:11:49,129 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 07:11:49,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-19 07:11:49,129 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 07:11:49,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-19 07:11:49,129 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 07:11:49,130 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:11:49,130 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:11:49,247 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:11:49,250 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:11:49,455 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:11:49,506 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:11:49,519 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-19 07:11:49,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:11:49 BoogieIcfgContainer [2022-11-19 07:11:49,522 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:11:49,526 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:11:49,526 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:11:49,531 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:11:49,547 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:11:48" (1/3) ... [2022-11-19 07:11:49,548 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@270f00aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:11:49, skipping insertion in model container [2022-11-19 07:11:49,548 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:11:48" (2/3) ... [2022-11-19 07:11:49,549 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@270f00aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:11:49, skipping insertion in model container [2022-11-19 07:11:49,549 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:11:49" (3/3) ... [2022-11-19 07:11:49,551 INFO L112 eAbstractionObserver]: Analyzing ICFG 960521-1-2.i [2022-11-19 07:11:49,591 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:11:49,591 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2022-11-19 07:11:49,684 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:11:49,695 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;@79272950, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:11:49,696 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2022-11-19 07:11:49,706 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 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) [2022-11-19 07:11:49,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-19 07:11:49,715 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:49,716 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-19 07:11:49,716 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)] === [2022-11-19 07:11:49,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:49,727 INFO L85 PathProgramCache]: Analyzing trace with hash 3507, now seen corresponding path program 1 times [2022-11-19 07:11:49,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:49,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263469480] [2022-11-19 07:11:49,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:49,743 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:49,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:50,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:50,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:50,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263469480] [2022-11-19 07:11:50,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263469480] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:50,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:50,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-19 07:11:50,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990811412] [2022-11-19 07:11:50,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:50,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:11:50,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:50,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:11:50,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:11:50,069 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 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 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:50,181 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2022-11-19 07:11:50,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:11:50,184 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-19 07:11:50,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:50,200 INFO L225 Difference]: With dead ends: 43 [2022-11-19 07:11:50,200 INFO L226 Difference]: Without dead ends: 42 [2022-11-19 07:11:50,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:11:50,209 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:50,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:11:50,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-19 07:11:50,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-19 07:11:50,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 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) [2022-11-19 07:11:50,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-11-19 07:11:50,264 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2022-11-19 07:11:50,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:50,264 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-11-19 07:11:50,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,267 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-11-19 07:11:50,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-19 07:11:50,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:50,268 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-19 07:11:50,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:11:50,269 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:50,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:50,271 INFO L85 PathProgramCache]: Analyzing trace with hash 3508, now seen corresponding path program 1 times [2022-11-19 07:11:50,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:50,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439732135] [2022-11-19 07:11:50,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:50,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:50,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:50,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:50,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:50,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439732135] [2022-11-19 07:11:50,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439732135] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:50,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:50,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-19 07:11:50,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089597499] [2022-11-19 07:11:50,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:50,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:11:50,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:50,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:11:50,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:11:50,577 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:50,622 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-11-19 07:11:50,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:11:50,625 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2022-11-19 07:11:50,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:50,626 INFO L225 Difference]: With dead ends: 41 [2022-11-19 07:11:50,627 INFO L226 Difference]: Without dead ends: 41 [2022-11-19 07:11:50,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:11:50,630 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:50,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:11:50,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-19 07:11:50,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-19 07:11:50,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 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) [2022-11-19 07:11:50,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-19 07:11:50,642 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2022-11-19 07:11:50,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:50,647 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-19 07:11:50,647 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:50,648 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-19 07:11:50,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-19 07:11:50,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:50,648 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-19 07:11:50,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 07:11:50,649 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:50,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:50,662 INFO L85 PathProgramCache]: Analyzing trace with hash 3443713, now seen corresponding path program 1 times [2022-11-19 07:11:50,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:50,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623423663] [2022-11-19 07:11:50,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:50,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:50,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:50,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:50,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:50,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623423663] [2022-11-19 07:11:50,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623423663] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:50,850 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:50,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:11:50,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630752855] [2022-11-19 07:11:50,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:50,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:11:50,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:50,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:11:50,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:50,852 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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) [2022-11-19 07:11:50,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:50,901 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2022-11-19 07:11:50,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:11:50,902 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 [2022-11-19 07:11:50,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:50,903 INFO L225 Difference]: With dead ends: 38 [2022-11-19 07:11:50,903 INFO L226 Difference]: Without dead ends: 38 [2022-11-19 07:11:50,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:50,905 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:50,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:11:50,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-19 07:11:50,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-11-19 07:11:50,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 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) [2022-11-19 07:11:50,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-11-19 07:11:50,912 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2022-11-19 07:11:50,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:50,912 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-11-19 07:11:50,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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) [2022-11-19 07:11:50,913 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-11-19 07:11:50,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-19 07:11:50,913 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:50,913 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-19 07:11:50,914 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 07:11:50,914 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:50,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:50,915 INFO L85 PathProgramCache]: Analyzing trace with hash 3443714, now seen corresponding path program 1 times [2022-11-19 07:11:50,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:50,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395722735] [2022-11-19 07:11:50,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:50,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:50,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:51,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:51,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:51,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395722735] [2022-11-19 07:11:51,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395722735] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:51,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:51,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:11:51,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801218128] [2022-11-19 07:11:51,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:51,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:11:51,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:51,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:11:51,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:51,211 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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) [2022-11-19 07:11:51,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:51,292 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2022-11-19 07:11:51,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:11:51,293 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 [2022-11-19 07:11:51,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:51,294 INFO L225 Difference]: With dead ends: 44 [2022-11-19 07:11:51,294 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:11:51,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:51,296 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:51,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 67 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:11:51,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:11:51,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2022-11-19 07:11:51,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.76) internal successors, (44), 40 states have internal predecessors, (44), 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) [2022-11-19 07:11:51,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2022-11-19 07:11:51,302 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 4 [2022-11-19 07:11:51,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:51,303 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2022-11-19 07:11:51,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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) [2022-11-19 07:11:51,303 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2022-11-19 07:11:51,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-19 07:11:51,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:51,304 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-19 07:11:51,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-19 07:11:51,304 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:51,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:51,305 INFO L85 PathProgramCache]: Analyzing trace with hash 106825754, now seen corresponding path program 1 times [2022-11-19 07:11:51,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:51,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464781533] [2022-11-19 07:11:51,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:51,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:51,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:51,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:51,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:51,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464781533] [2022-11-19 07:11:51,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464781533] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:51,371 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:51,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:11:51,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544449706] [2022-11-19 07:11:51,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:51,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:11:51,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:51,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:11:51,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:51,374 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 4 states, 4 states have (on average 1.25) 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) [2022-11-19 07:11:51,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:51,423 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-11-19 07:11:51,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:11:51,423 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) 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 [2022-11-19 07:11:51,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:51,426 INFO L225 Difference]: With dead ends: 44 [2022-11-19 07:11:51,427 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 07:11:51,431 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 [2022-11-19 07:11:51,435 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 49 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:51,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 61 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:11:51,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 07:11:51,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2022-11-19 07:11:51,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.72) internal successors, (43), 40 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) [2022-11-19 07:11:51,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-19 07:11:51,453 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 5 [2022-11-19 07:11:51,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:51,453 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-19 07:11:51,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) 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) [2022-11-19 07:11:51,454 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-19 07:11:51,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 07:11:51,455 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:51,455 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-11-19 07:11:51,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-19 07:11:51,461 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:51,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:51,462 INFO L85 PathProgramCache]: Analyzing trace with hash -985496187, now seen corresponding path program 1 times [2022-11-19 07:11:51,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:51,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851821351] [2022-11-19 07:11:51,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:51,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:51,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:51,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:51,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:51,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851821351] [2022-11-19 07:11:51,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851821351] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:51,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397300388] [2022-11-19 07:11:51,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:51,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:51,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:51,899 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:51,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:11:52,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:52,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:11:52,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:52,101 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-19 07:11:52,102 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 [2022-11-19 07:11:52,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:52,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:52,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:52,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397300388] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:52,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404092545] [2022-11-19 07:11:52,402 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-19 07:11:52,402 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:52,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:52,416 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:52,417 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:52,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:11:52,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-11-19 07:11:52,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-11-19 07:11:52,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:52,954 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:11:52,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:53,000 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-11-19 07:11:53,003 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-11-19 07:11:53,134 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 [2022-11-19 07:11:53,148 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:53,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '520#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:11:53,444 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:53,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:53,445 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2022-11-19 07:11:53,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304936744] [2022-11-19 07:11:53,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:53,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 07:11:53,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:53,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 07:11:53,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-11-19 07:11:53,447 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 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) [2022-11-19 07:11:53,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:53,812 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2022-11-19 07:11:53,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 07:11:53,814 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 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 6 [2022-11-19 07:11:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:53,814 INFO L225 Difference]: With dead ends: 53 [2022-11-19 07:11:53,815 INFO L226 Difference]: Without dead ends: 53 [2022-11-19 07:11:53,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:11:53,816 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 163 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:53,816 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 112 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:11:53,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-19 07:11:53,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2022-11-19 07:11:53,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 48 states have internal predecessors, (57), 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) [2022-11-19 07:11:53,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2022-11-19 07:11:53,821 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 6 [2022-11-19 07:11:53,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:53,821 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2022-11-19 07:11:53,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 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) [2022-11-19 07:11:53,821 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2022-11-19 07:11:53,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:11:53,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:53,822 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2022-11-19 07:11:53,839 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-19 07:11:54,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 07:11:54,033 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:54,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:54,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519764, now seen corresponding path program 1 times [2022-11-19 07:11:54,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:54,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779239547] [2022-11-19 07:11:54,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:54,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:54,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:54,113 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:11:54,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:54,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779239547] [2022-11-19 07:11:54,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1779239547] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:54,114 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:11:54,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:11:54,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738859703] [2022-11-19 07:11:54,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:54,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:11:54,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:54,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:11:54,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:11:54,116 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:54,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:54,169 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2022-11-19 07:11:54,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:11:54,173 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-19 07:11:54,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:54,174 INFO L225 Difference]: With dead ends: 47 [2022-11-19 07:11:54,174 INFO L226 Difference]: Without dead ends: 47 [2022-11-19 07:11:54,175 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 [2022-11-19 07:11:54,176 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 14 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:54,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:11:54,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-19 07:11:54,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-11-19 07:11:54,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 46 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) [2022-11-19 07:11:54,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-11-19 07:11:54,200 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 9 [2022-11-19 07:11:54,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:54,201 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-11-19 07:11:54,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:54,201 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-11-19 07:11:54,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-19 07:11:54,203 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:54,203 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2022-11-19 07:11:54,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-19 07:11:54,204 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:54,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:54,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1481519765, now seen corresponding path program 1 times [2022-11-19 07:11:54,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:54,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758282434] [2022-11-19 07:11:54,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:54,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:54,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:54,330 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:54,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:54,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758282434] [2022-11-19 07:11:54,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758282434] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:54,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115199395] [2022-11-19 07:11:54,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:54,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:54,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:54,333 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:54,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:11:54,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:54,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 07:11:54,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:54,504 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:54,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:54,558 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:54,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115199395] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:54,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296840687] [2022-11-19 07:11:54,561 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:11:54,561 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:54,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:54,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:54,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:54,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:11:54,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,656 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-11-19 07:11:54,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-11-19 07:11:54,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,884 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:11:54,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:54,929 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-11-19 07:11:54,930 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-11-19 07:11:55,018 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 [2022-11-19 07:11:55,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:55,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '797#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |ULTIMATE.start_foo_~i~0#1| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:11:55,323 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:55,323 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:55,323 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2022-11-19 07:11:55,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337519515] [2022-11-19 07:11:55,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:55,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 07:11:55,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:55,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 07:11:55,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:11:55,325 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-11-19 07:11:55,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:55,504 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2022-11-19 07:11:55,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 07:11:55,505 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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 [2022-11-19 07:11:55,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:55,506 INFO L225 Difference]: With dead ends: 111 [2022-11-19 07:11:55,506 INFO L226 Difference]: Without dead ends: 111 [2022-11-19 07:11:55,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:11:55,507 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 292 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:55,508 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 156 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:11:55,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-19 07:11:55,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 50. [2022-11-19 07:11:55,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 49 states have internal predecessors, (55), 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) [2022-11-19 07:11:55,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2022-11-19 07:11:55,513 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 9 [2022-11-19 07:11:55,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:55,513 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2022-11-19 07:11:55,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 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) [2022-11-19 07:11:55,513 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2022-11-19 07:11:55,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-19 07:11:55,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:55,514 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2022-11-19 07:11:55,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:55,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:55,720 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:55,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:55,721 INFO L85 PathProgramCache]: Analyzing trace with hash -1172884082, now seen corresponding path program 2 times [2022-11-19 07:11:55,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:55,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444757424] [2022-11-19 07:11:55,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:55,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:55,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:56,241 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:56,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:56,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444757424] [2022-11-19 07:11:56,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444757424] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:56,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824795904] [2022-11-19 07:11:56,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:56,242 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:56,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:56,244 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:56,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:11:56,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 07:11:56,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:56,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 15 conjunts are in the unsatisfiable core [2022-11-19 07:11:56,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:56,354 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-19 07:11:56,354 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 [2022-11-19 07:11:56,636 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:11:56,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:11:56,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1824795904] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:56,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1690375109] [2022-11-19 07:11:56,867 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-19 07:11:56,867 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:56,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:56,868 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:56,868 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:56,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,911 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:11:56,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:56,955 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-11-19 07:11:57,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:57,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:57,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:57,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-11-19 07:11:57,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:57,164 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:11:57,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:57,204 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-11-19 07:11:57,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-11-19 07:11:57,285 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 [2022-11-19 07:11:57,297 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:11:57,586 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1052#(and (not (<= (+ ~a~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~a~0.base))) (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:11:57,586 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:11:57,586 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:11:57,586 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 15 [2022-11-19 07:11:57,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276605302] [2022-11-19 07:11:57,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:11:57,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-19 07:11:57,587 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:57,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-19 07:11:57,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:11:57,588 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 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) [2022-11-19 07:11:58,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:58,067 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2022-11-19 07:11:58,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:11:58,068 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 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 [2022-11-19 07:11:58,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:58,069 INFO L225 Difference]: With dead ends: 49 [2022-11-19 07:11:58,069 INFO L226 Difference]: Without dead ends: 49 [2022-11-19 07:11:58,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2022-11-19 07:11:58,070 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 89 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:58,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 83 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:11:58,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-19 07:11:58,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-11-19 07:11:58,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.394736842105263) 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) [2022-11-19 07:11:58,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-11-19 07:11:58,074 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 12 [2022-11-19 07:11:58,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:58,074 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-11-19 07:11:58,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 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) [2022-11-19 07:11:58,074 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-11-19 07:11:58,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-19 07:11:58,075 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:58,075 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2022-11-19 07:11:58,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:58,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:58,281 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:11:58,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:58,281 INFO L85 PathProgramCache]: Analyzing trace with hash -845963127, now seen corresponding path program 2 times [2022-11-19 07:11:58,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:58,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688868789] [2022-11-19 07:11:58,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:58,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:58,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:58,441 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:11:58,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:58,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688868789] [2022-11-19 07:11:58,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688868789] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:58,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553687754] [2022-11-19 07:11:58,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:11:58,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:58,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:58,444 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:58,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:11:58,555 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2022-11-19 07:11:58,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:11:58,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 07:11:58,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:58,592 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:11:58,592 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 [2022-11-19 07:11:58,696 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 07:11:58,696 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 07:11:58,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553687754] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:11:58,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 07:11:58,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [9] total 11 [2022-11-19 07:11:58,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754453647] [2022-11-19 07:11:58,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:11:58,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:11:58,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:11:58,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:11:58,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:11:58,699 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), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:58,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:11:58,741 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2022-11-19 07:11:58,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:11:58,742 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-19 07:11:58,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:11:58,743 INFO L225 Difference]: With dead ends: 43 [2022-11-19 07:11:58,743 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 07:11:58,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2022-11-19 07:11:58,745 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:11:58,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 24 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:11:58,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 07:11:58,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-19 07:11:58,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 36 states have (on average 1.25) internal successors, (45), 42 states have internal predecessors, (45), 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) [2022-11-19 07:11:58,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-11-19 07:11:58,748 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 17 [2022-11-19 07:11:58,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:11:58,749 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-11-19 07:11:58,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:11:58,749 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-11-19 07:11:58,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 07:11:58,750 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:11:58,750 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1] [2022-11-19 07:11:58,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:11:58,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 07:11:58,956 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)] === [2022-11-19 07:11:58,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:11:58,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1221701863, now seen corresponding path program 1 times [2022-11-19 07:11:58,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:11:58,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342343763] [2022-11-19 07:11:58,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:58,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:11:58,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:59,111 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:59,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:11:59,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342343763] [2022-11-19 07:11:59,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342343763] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:11:59,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236256544] [2022-11-19 07:11:59,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:11:59,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:11:59,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:11:59,115 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:11:59,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:11:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:11:59,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 07:11:59,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:11:59,378 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:59,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:11:59,541 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:11:59,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236256544] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:11:59,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1781473612] [2022-11-19 07:11:59,543 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:11:59,544 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:11:59,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:11:59,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:11:59,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:11:59,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:11:59,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-11-19 07:11:59,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-11-19 07:11:59,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,808 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:11:59,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:11:59,843 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-11-19 07:11:59,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-11-19 07:11:59,915 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 [2022-11-19 07:11:59,936 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 [2022-11-19 07:11:59,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 78 [2022-11-19 07:12:00,013 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 [2022-11-19 07:12:00,029 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 [2022-11-19 07:12:00,038 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:00,503 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1447#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:12:00,503 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:00,503 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:00,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2022-11-19 07:12:00,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593667957] [2022-11-19 07:12:00,504 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:00,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-19 07:12:00,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:00,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-19 07:12:00,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=587, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:12:00,505 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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) [2022-11-19 07:12:00,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:00,884 INFO L93 Difference]: Finished difference Result 210 states and 211 transitions. [2022-11-19 07:12:00,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 07:12:00,885 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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 19 [2022-11-19 07:12:00,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:00,886 INFO L225 Difference]: With dead ends: 210 [2022-11-19 07:12:00,886 INFO L226 Difference]: Without dead ends: 210 [2022-11-19 07:12:00,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=417, Invalid=915, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:12:00,888 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 703 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 703 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:00,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [703 Valid, 171 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:12:00,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-11-19 07:12:00,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 67. [2022-11-19 07:12:00,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 60 states have (on average 1.2166666666666666) internal successors, (73), 66 states have internal predecessors, (73), 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) [2022-11-19 07:12:00,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2022-11-19 07:12:00,894 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 19 [2022-11-19 07:12:00,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:00,894 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2022-11-19 07:12:00,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 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) [2022-11-19 07:12:00,895 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2022-11-19 07:12:00,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-19 07:12:00,895 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:00,896 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 2, 1, 1, 1, 1, 1] [2022-11-19 07:12:00,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:01,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:01,103 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:01,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:01,103 INFO L85 PathProgramCache]: Analyzing trace with hash -2074921727, now seen corresponding path program 2 times [2022-11-19 07:12:01,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:01,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989674271] [2022-11-19 07:12:01,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:01,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:01,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:01,619 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 07:12:01,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:01,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989674271] [2022-11-19 07:12:01,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989674271] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:01,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33734449] [2022-11-19 07:12:01,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:12:01,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:01,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:01,621 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:01,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:12:01,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 07:12:01,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:01,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 07:12:01,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:01,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-19 07:12:01,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2022-11-19 07:12:02,845 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-19 07:12:02,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:03,334 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-19 07:12:03,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33734449] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:03,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143212525] [2022-11-19 07:12:03,337 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:12:03,337 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:03,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:03,337 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:03,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:03,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:12:03,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-19 07:12:03,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2022-11-19 07:12:03,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:03,599 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:12:03,652 INFO L321 Elim1Store]: treesize reduction 108, result has 20.6 percent of original size [2022-11-19 07:12:03,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 302 [2022-11-19 07:12:03,746 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 [2022-11-19 07:12:03,775 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 11 treesize of output 9 [2022-11-19 07:12:03,810 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-11-19 07:12:03,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 79 [2022-11-19 07:12:03,856 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 [2022-11-19 07:12:03,872 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 [2022-11-19 07:12:03,881 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:04,428 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1973#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:12:04,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:04,428 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:04,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 4, 4] total 25 [2022-11-19 07:12:04,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134568721] [2022-11-19 07:12:04,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:04,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:12:04,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:04,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:12:04,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:12:04,432 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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) [2022-11-19 07:12:06,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:06,319 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2022-11-19 07:12:06,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:12:06,320 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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 35 [2022-11-19 07:12:06,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:06,322 INFO L225 Difference]: With dead ends: 69 [2022-11-19 07:12:06,322 INFO L226 Difference]: Without dead ends: 69 [2022-11-19 07:12:06,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 693 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=941, Invalid=2719, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:12:06,325 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 19 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 22 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:06,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 130 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 80 Invalid, 0 Unknown, 22 Unchecked, 0.1s Time] [2022-11-19 07:12:06,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-11-19 07:12:06,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-11-19 07:12:06,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 62 states have (on average 1.1774193548387097) internal successors, (73), 68 states have internal predecessors, (73), 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) [2022-11-19 07:12:06,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2022-11-19 07:12:06,334 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 35 [2022-11-19 07:12:06,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:06,334 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2022-11-19 07:12:06,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.076923076923077) internal successors, (54), 25 states have internal predecessors, (54), 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) [2022-11-19 07:12:06,334 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2022-11-19 07:12:06,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-19 07:12:06,338 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:06,339 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 4, 3, 1, 1, 1, 1] [2022-11-19 07:12:06,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:06,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 07:12:06,546 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:06,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:06,546 INFO L85 PathProgramCache]: Analyzing trace with hash 38367678, now seen corresponding path program 3 times [2022-11-19 07:12:06,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:06,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538978711] [2022-11-19 07:12:06,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:06,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:06,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:07,034 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:07,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:07,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538978711] [2022-11-19 07:12:07,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538978711] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:07,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048597661] [2022-11-19 07:12:07,035 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:12:07,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:07,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:07,043 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:07,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:12:07,382 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:12:07,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:07,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-19 07:12:07,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:07,811 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:07,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:08,355 INFO L134 CoverageAnalysis]: Checked inductivity of 237 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:08,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048597661] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:08,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1488856684] [2022-11-19 07:12:08,357 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:12:08,357 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:08,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:08,358 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:08,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:08,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:12:08,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,420 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-19 07:12:08,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 45 [2022-11-19 07:12:08,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:08,625 INFO L321 Elim1Store]: treesize reduction 108, result has 12.2 percent of original size [2022-11-19 07:12:08,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 301 [2022-11-19 07:12:08,712 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 [2022-11-19 07:12:08,759 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 [2022-11-19 07:12:08,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 78 [2022-11-19 07:12:08,845 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 [2022-11-19 07:12:08,864 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 [2022-11-19 07:12:08,874 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:09,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2468#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:12:09,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:09,413 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:09,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 51 [2022-11-19 07:12:09,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375978486] [2022-11-19 07:12:09,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:09,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-19 07:12:09,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:09,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-19 07:12:09,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1183, Invalid=2009, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 07:12:09,417 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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) [2022-11-19 07:12:10,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:10,604 INFO L93 Difference]: Finished difference Result 478 states and 479 transitions. [2022-11-19 07:12:10,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-19 07:12:10,605 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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 41 [2022-11-19 07:12:10,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:10,609 INFO L225 Difference]: With dead ends: 478 [2022-11-19 07:12:10,610 INFO L226 Difference]: Without dead ends: 478 [2022-11-19 07:12:10,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1999 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1776, Invalid=3480, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 07:12:10,612 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1660 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 144 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1660 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:10,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1660 Valid, 418 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:12:10,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2022-11-19 07:12:10,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 121. [2022-11-19 07:12:10,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 114 states have (on average 1.1754385964912282) internal successors, (134), 120 states have internal predecessors, (134), 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) [2022-11-19 07:12:10,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 134 transitions. [2022-11-19 07:12:10,630 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 134 transitions. Word has length 41 [2022-11-19 07:12:10,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:10,631 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 134 transitions. [2022-11-19 07:12:10,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.9423076923076923) internal successors, (101), 51 states have internal predecessors, (101), 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) [2022-11-19 07:12:10,631 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 134 transitions. [2022-11-19 07:12:10,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-19 07:12:10,640 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:10,640 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 4, 3, 1, 1, 1, 1] [2022-11-19 07:12:10,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-19 07:12:10,847 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 07:12:10,847 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:10,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:10,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1417164309, now seen corresponding path program 4 times [2022-11-19 07:12:10,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:10,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661895022] [2022-11-19 07:12:10,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:10,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:12,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:12,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:12,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661895022] [2022-11-19 07:12:12,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661895022] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:12,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790592805] [2022-11-19 07:12:12,334 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:12:12,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:12,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:12,336 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:12,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:12:12,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:12,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-19 07:12:12,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:13,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:13,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:15,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1036 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:15,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790592805] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:15,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [710522677] [2022-11-19 07:12:15,641 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:12:15,641 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:15,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:15,642 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:15,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:15,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,677 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:12:15,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2022-11-19 07:12:15,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,749 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 47 [2022-11-19 07:12:15,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,850 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:12:15,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:15,890 INFO L321 Elim1Store]: treesize reduction 112, result has 13.2 percent of original size [2022-11-19 07:12:15,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 307 treesize of output 303 [2022-11-19 07:12:15,961 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 [2022-11-19 07:12:15,975 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 11 treesize of output 9 [2022-11-19 07:12:16,010 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-11-19 07:12:16,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 79 [2022-11-19 07:12:16,062 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 [2022-11-19 07:12:16,075 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 [2022-11-19 07:12:16,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:16,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3651#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:12:16,632 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:16,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:16,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 102 [2022-11-19 07:12:16,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455766498] [2022-11-19 07:12:16,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:16,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-11-19 07:12:16,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:16,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-11-19 07:12:16,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4651, Invalid=6905, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 07:12:16,639 INFO L87 Difference]: Start difference. First operand 121 states and 134 transitions. Second operand has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 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) [2022-11-19 07:12:20,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:20,082 INFO L93 Difference]: Finished difference Result 988 states and 989 transitions. [2022-11-19 07:12:20,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-19 07:12:20,083 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 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 75 [2022-11-19 07:12:20,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:20,097 INFO L225 Difference]: With dead ends: 988 [2022-11-19 07:12:20,097 INFO L226 Difference]: Without dead ends: 988 [2022-11-19 07:12:20,102 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=6995, Invalid=12745, Unknown=0, NotChecked=0, Total=19740 [2022-11-19 07:12:20,103 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 3994 mSDsluCounter, 722 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3994 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:20,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3994 Valid, 741 Invalid, 828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [364 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:12:20,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2022-11-19 07:12:20,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 223. [2022-11-19 07:12:20,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 216 states have (on average 1.1712962962962963) internal successors, (253), 222 states have internal predecessors, (253), 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) [2022-11-19 07:12:20,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 253 transitions. [2022-11-19 07:12:20,129 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 253 transitions. Word has length 75 [2022-11-19 07:12:20,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:20,163 INFO L495 AbstractCegarLoop]: Abstraction has 223 states and 253 transitions. [2022-11-19 07:12:20,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.970873786407767) internal successors, (203), 102 states have internal predecessors, (203), 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) [2022-11-19 07:12:20,164 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 253 transitions. [2022-11-19 07:12:20,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-11-19 07:12:20,169 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:20,169 INFO L195 NwaCegarLoop]: trace histogram [66, 66, 4, 3, 1, 1, 1, 1] [2022-11-19 07:12:20,177 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:20,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 07:12:20,377 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:20,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:20,377 INFO L85 PathProgramCache]: Analyzing trace with hash 2050123909, now seen corresponding path program 5 times [2022-11-19 07:12:20,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:20,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611642069] [2022-11-19 07:12:20,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:20,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:20,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:25,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4368 backedges. 0 proven. 4356 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 07:12:25,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:25,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611642069] [2022-11-19 07:12:25,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611642069] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:25,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116340095] [2022-11-19 07:12:25,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:12:25,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:25,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:25,044 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:25,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:12:25,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 07:12:25,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:12:25,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:12:25,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:25,238 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:12:25,239 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 [2022-11-19 07:12:25,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-19 07:12:28,528 INFO L134 CoverageAnalysis]: Checked inductivity of 4368 backedges. 6 proven. 66 refuted. 0 times theorem prover too weak. 4296 trivial. 0 not checked. [2022-11-19 07:12:28,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:12:30,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4368 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 4296 trivial. 0 not checked. [2022-11-19 07:12:30,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116340095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:12:30,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [113243294] [2022-11-19 07:12:30,056 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2022-11-19 07:12:30,056 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:12:30,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:12:30,057 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:12:30,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:12:30,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:12:30,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-19 07:12:30,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,155 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 40 [2022-11-19 07:12:30,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:12:30,268 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:12:30,318 INFO L321 Elim1Store]: treesize reduction 108, result has 20.6 percent of original size [2022-11-19 07:12:30,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 302 [2022-11-19 07:12:30,445 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 [2022-11-19 07:12:30,462 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 11 treesize of output 9 [2022-11-19 07:12:30,494 INFO L321 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-11-19 07:12:30,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 79 [2022-11-19 07:12:30,543 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 [2022-11-19 07:12:30,558 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 [2022-11-19 07:12:30,566 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:12:31,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5865#(and (not (<= (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base))) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:12:31,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:12:31,308 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:12:31,309 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 5, 5] total 79 [2022-11-19 07:12:31,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55914901] [2022-11-19 07:12:31,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:12:31,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-19 07:12:31,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:31,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-19 07:12:31,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=4657, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 07:12:31,313 INFO L87 Difference]: Start difference. First operand 223 states and 253 transitions. Second operand has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 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) [2022-11-19 07:12:46,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:46,289 INFO L93 Difference]: Finished difference Result 224 states and 225 transitions. [2022-11-19 07:12:46,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2022-11-19 07:12:46,290 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 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 143 [2022-11-19 07:12:46,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:46,291 INFO L225 Difference]: With dead ends: 224 [2022-11-19 07:12:46,292 INFO L226 Difference]: Without dead ends: 224 [2022-11-19 07:12:46,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 413 SyntacticMatches, 0 SemanticMatches, 217 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10656 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=14349, Invalid=33393, Unknown=0, NotChecked=0, Total=47742 [2022-11-19 07:12:46,298 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 74 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 23 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:46,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 135 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 140 Invalid, 0 Unknown, 23 Unchecked, 0.2s Time] [2022-11-19 07:12:46,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2022-11-19 07:12:46,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2022-11-19 07:12:46,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 218 states have (on average 1.0321100917431192) internal successors, (225), 223 states have internal predecessors, (225), 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) [2022-11-19 07:12:46,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 225 transitions. [2022-11-19 07:12:46,305 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 225 transitions. Word has length 143 [2022-11-19 07:12:46,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:46,305 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 225 transitions. [2022-11-19 07:12:46,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.0) internal successors, (160), 79 states have internal predecessors, (160), 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) [2022-11-19 07:12:46,306 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 225 transitions. [2022-11-19 07:12:46,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2022-11-19 07:12:46,307 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:46,307 INFO L195 NwaCegarLoop]: trace histogram [67, 67, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:46,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:12:46,513 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:46,513 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:46,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:46,514 INFO L85 PathProgramCache]: Analyzing trace with hash -915107574, now seen corresponding path program 1 times [2022-11-19 07:12:46,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:46,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343314189] [2022-11-19 07:12:46,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:46,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:46,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:46,779 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5578 trivial. 0 not checked. [2022-11-19 07:12:46,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:46,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343314189] [2022-11-19 07:12:46,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343314189] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:12:46,780 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:12:46,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-19 07:12:46,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250047440] [2022-11-19 07:12:46,780 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:12:46,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:12:46,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:12:46,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:12:46,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:12:46,783 INFO L87 Difference]: Start difference. First operand 224 states and 225 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 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) [2022-11-19 07:12:46,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:12:46,802 INFO L93 Difference]: Finished difference Result 222 states and 223 transitions. [2022-11-19 07:12:46,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:12:46,803 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 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 208 [2022-11-19 07:12:46,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:12:46,805 INFO L225 Difference]: With dead ends: 222 [2022-11-19 07:12:46,805 INFO L226 Difference]: Without dead ends: 222 [2022-11-19 07:12:46,805 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:12:46,806 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:12:46,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:12:46,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2022-11-19 07:12:46,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 222. [2022-11-19 07:12:46,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 218 states have (on average 1.0229357798165137) internal successors, (223), 221 states have internal predecessors, (223), 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) [2022-11-19 07:12:46,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 223 transitions. [2022-11-19 07:12:46,814 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 223 transitions. Word has length 208 [2022-11-19 07:12:46,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:12:46,815 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 223 transitions. [2022-11-19 07:12:46,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 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) [2022-11-19 07:12:46,816 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 223 transitions. [2022-11-19 07:12:46,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2022-11-19 07:12:46,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:12:46,822 INFO L195 NwaCegarLoop]: trace histogram [67, 67, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:12:46,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-19 07:12:46,823 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:12:46,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:12:46,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1036559870, now seen corresponding path program 1 times [2022-11-19 07:12:46,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:12:46,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181865219] [2022-11-19 07:12:46,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:46,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:12:46,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:51,966 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-11-19 07:12:51,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:12:51,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181865219] [2022-11-19 07:12:51,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181865219] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:12:51,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333973831] [2022-11-19 07:12:51,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:12:51,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:12:51,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:12:51,967 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:12:51,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:12:52,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:12:52,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-19 07:12:52,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:12:55,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-11-19 07:12:55,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:13:02,199 INFO L134 CoverageAnalysis]: Checked inductivity of 5578 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2022-11-19 07:13:02,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333973831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:13:02,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1961179340] [2022-11-19 07:13:02,201 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:13:02,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:13:02,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:13:02,202 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:13:02,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:13:02,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,235 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 35 [2022-11-19 07:13:02,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-19 07:13:02,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 45 [2022-11-19 07:13:02,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:13:02,426 INFO L321 Elim1Store]: treesize reduction 108, result has 12.2 percent of original size [2022-11-19 07:13:02,426 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 301 [2022-11-19 07:13:02,498 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 [2022-11-19 07:13:02,529 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 [2022-11-19 07:13:02,551 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 78 [2022-11-19 07:13:02,580 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 [2022-11-19 07:13:02,592 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 [2022-11-19 07:13:02,645 INFO L321 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-11-19 07:13:02,646 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2022-11-19 07:13:02,665 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:13:04,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8495#(and (< ~a~0.base |#StackHeapBarrier|) (= (+ (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4) (* |ULTIMATE.start_foo_~i~0#1| 4))) 1) 0) (or (= (select |#valid| ~b~0.base) 1) (= ~a~0.base ~b~0.base)) (<= (+ ~b~0.offset (* |ULTIMATE.start_foo_~i~0#1| 4)) (select |#length| ~b~0.base)) (<= 32767 |ULTIMATE.start_foo_~i~0#1|) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (= (select |#valid| ~a~0.base) 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2022-11-19 07:13:04,139 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:13:04,139 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:13:04,140 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 207 [2022-11-19 07:13:04,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983277900] [2022-11-19 07:13:04,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:13:04,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 208 states [2022-11-19 07:13:04,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:13:04,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 208 interpolants. [2022-11-19 07:13:04,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19099, Invalid=27773, Unknown=0, NotChecked=0, Total=46872 [2022-11-19 07:13:04,153 INFO L87 Difference]: Start difference. First operand 222 states and 223 transitions. Second operand has 208 states, 208 states have (on average 2.014423076923077) internal successors, (419), 207 states have internal predecessors, (419), 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) [2022-11-19 07:13:18,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:13:18,345 INFO L93 Difference]: Finished difference Result 1770 states and 1771 transitions. [2022-11-19 07:13:18,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-11-19 07:13:18,346 INFO L78 Accepts]: Start accepts. Automaton has has 208 states, 208 states have (on average 2.014423076923077) internal successors, (419), 207 states have internal predecessors, (419), 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 210 [2022-11-19 07:13:18,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:13:18,352 INFO L225 Difference]: With dead ends: 1770 [2022-11-19 07:13:18,352 INFO L226 Difference]: Without dead ends: 1770 [2022-11-19 07:13:18,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 766 GetRequests, 483 SyntacticMatches, 0 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31355 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=28688, Invalid=52252, Unknown=0, NotChecked=0, Total=80940 [2022-11-19 07:13:18,358 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 9249 mSDsluCounter, 1292 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 825 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9249 SdHoareTripleChecker+Valid, 1309 SdHoareTripleChecker+Invalid, 1590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 825 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:13:18,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9249 Valid, 1309 Invalid, 1590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [825 Valid, 765 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:13:18,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1770 states. [2022-11-19 07:13:18,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1770 to 430. [2022-11-19 07:13:18,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 426 states have (on average 1.011737089201878) internal successors, (431), 429 states have internal predecessors, (431), 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) [2022-11-19 07:13:18,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 431 transitions. [2022-11-19 07:13:18,374 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 431 transitions. Word has length 210 [2022-11-19 07:13:18,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:13:18,375 INFO L495 AbstractCegarLoop]: Abstraction has 430 states and 431 transitions. [2022-11-19 07:13:18,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 208 states, 208 states have (on average 2.014423076923077) internal successors, (419), 207 states have internal predecessors, (419), 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) [2022-11-19 07:13:18,376 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 431 transitions. [2022-11-19 07:13:18,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2022-11-19 07:13:18,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:13:18,384 INFO L195 NwaCegarLoop]: trace histogram [136, 136, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:13:18,391 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-11-19 07:13:18,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:13:18,592 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2022-11-19 07:13:18,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:13:18,593 INFO L85 PathProgramCache]: Analyzing trace with hash 2031979613, now seen corresponding path program 2 times [2022-11-19 07:13:18,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:13:18,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112433587] [2022-11-19 07:13:18,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:13:18,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:13:19,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:13:38,063 INFO L134 CoverageAnalysis]: Checked inductivity of 23120 backedges. 0 proven. 18496 refuted. 0 times theorem prover too weak. 4624 trivial. 0 not checked. [2022-11-19 07:13:38,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:13:38,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112433587] [2022-11-19 07:13:38,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112433587] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:13:38,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371623258] [2022-11-19 07:13:38,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:13:38,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:13:38,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:13:38,066 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:13:38,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b8c541-5001-4d2a-a241-f7b09094599c/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process