./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 16:06:00,514 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 16:06:00,521 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 16:06:00,545 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 16:06:00,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 16:06:00,552 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 16:06:00,557 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 16:06:00,560 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 16:06:00,562 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 16:06:00,567 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 16:06:00,569 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 16:06:00,570 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 16:06:00,571 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 16:06:00,573 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 16:06:00,575 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 16:06:00,578 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 16:06:00,580 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 16:06:00,581 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 16:06:00,582 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 16:06:00,587 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 16:06:00,589 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 16:06:00,591 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 16:06:00,593 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 16:06:00,594 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 16:06:00,602 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 16:06:00,605 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 16:06:00,605 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 16:06:00,606 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 16:06:00,607 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 16:06:00,608 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 16:06:00,610 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 16:06:00,611 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 16:06:00,612 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 16:06:00,614 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 16:06:00,615 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 16:06:00,616 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 16:06:00,617 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 16:06:00,617 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 16:06:00,617 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 16:06:00,619 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 16:06:00,620 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 16:06:00,620 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-23 16:06:00,655 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 16:06:00,655 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 16:06:00,656 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 16:06:00,656 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 16:06:00,657 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 16:06:00,657 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 16:06:00,658 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 16:06:00,658 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 16:06:00,658 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 16:06:00,658 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 16:06:00,659 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 16:06:00,660 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 16:06:00,660 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 16:06:00,660 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 16:06:00,660 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 16:06:00,660 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 16:06:00,661 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 16:06:00,661 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 16:06:00,662 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-23 16:06:00,662 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-23 16:06:00,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 16:06:00,663 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 16:06:00,663 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-23 16:06:00,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 16:06:00,664 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 16:06:00,664 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 16:06:00,664 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-23 16:06:00,664 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-23 16:06:00,665 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-23 16:06:00,665 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 16:06:00,665 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-23 16:06:00,665 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 16:06:00,665 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 16:06:00,666 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 16:06:00,666 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 16:06:00,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:06:00,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 16:06:00,667 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 16:06:00,667 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 16:06:00,667 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 16:06:00,668 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 16:06:00,668 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 16:06:00,668 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_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 [2022-11-23 16:06:00,931 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 16:06:00,954 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 16:06:00,956 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 16:06:00,958 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 16:06:00,958 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 16:06:00,959 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2022-11-23 16:06:03,901 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 16:06:04,254 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 16:06:04,255 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2022-11-23 16:06:04,273 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/data/a395af6ed/28ff59c2df4245ce81f0bb6bcc68bf25/FLAGbd468b431 [2022-11-23 16:06:04,297 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/data/a395af6ed/28ff59c2df4245ce81f0bb6bcc68bf25 [2022-11-23 16:06:04,299 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 16:06:04,301 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 16:06:04,302 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 16:06:04,302 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 16:06:04,306 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 16:06:04,307 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,308 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fc419e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04, skipping insertion in model container [2022-11-23 16:06:04,308 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,315 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 16:06:04,350 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 16:06:04,638 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:06:04,663 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 16:06:04,723 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:06:04,761 INFO L208 MainTranslator]: Completed translation [2022-11-23 16:06:04,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04 WrapperNode [2022-11-23 16:06:04,762 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 16:06:04,764 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 16:06:04,764 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 16:06:04,764 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 16:06:04,771 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,803 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,836 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 102 [2022-11-23 16:06:04,837 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 16:06:04,837 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 16:06:04,838 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 16:06:04,838 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 16:06:04,846 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,846 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,851 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,852 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,867 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,871 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,872 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,873 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,881 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 16:06:04,883 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 16:06:04,883 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 16:06:04,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 16:06:04,884 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (1/1) ... [2022-11-23 16:06:04,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:06:04,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:04,909 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 16:06:04,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 16:06:04,950 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-23 16:06:04,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-23 16:06:04,950 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 16:06:04,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 16:06:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 16:06:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 16:06:05,069 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 16:06:05,071 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 16:06:05,429 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 16:06:05,544 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 16:06:05,544 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-11-23 16:06:05,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:06:05 BoogieIcfgContainer [2022-11-23 16:06:05,547 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 16:06:05,549 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 16:06:05,549 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 16:06:05,556 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 16:06:05,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:06:04" (1/3) ... [2022-11-23 16:06:05,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1566af52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:06:05, skipping insertion in model container [2022-11-23 16:06:05,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:06:04" (2/3) ... [2022-11-23 16:06:05,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1566af52 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:06:05, skipping insertion in model container [2022-11-23 16:06:05,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:06:05" (3/3) ... [2022-11-23 16:06:05,559 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrspn-alloca-1.i [2022-11-23 16:06:05,580 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 16:06:05,580 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2022-11-23 16:06:05,644 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 16:06:05,652 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;@421061dd, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 16:06:05,653 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2022-11-23 16:06:05,657 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 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) [2022-11-23 16:06:05,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-23 16:06:05,667 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:05,668 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-23 16:06:05,669 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:05,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:05,678 INFO L85 PathProgramCache]: Analyzing trace with hash 162186, now seen corresponding path program 1 times [2022-11-23 16:06:05,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:05,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751474815] [2022-11-23 16:06:05,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:05,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:05,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:06,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:06,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:06,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751474815] [2022-11-23 16:06:06,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751474815] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:06,138 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:06,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-23 16:06:06,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721641233] [2022-11-23 16:06:06,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:06,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 16:06:06,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:06,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 16:06:06,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 16:06:06,179 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 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 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:06,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:06,248 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-11-23 16:06:06,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 16:06:06,251 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2022-11-23 16:06:06,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:06,259 INFO L225 Difference]: With dead ends: 37 [2022-11-23 16:06:06,260 INFO L226 Difference]: Without dead ends: 36 [2022-11-23 16:06:06,262 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 [2022-11-23 16:06:06,265 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:06,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:06,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-23 16:06:06,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-11-23 16:06:06,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:06,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-11-23 16:06:06,301 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2022-11-23 16:06:06,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:06,302 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-11-23 16:06:06,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:06,302 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-11-23 16:06:06,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-23 16:06:06,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:06,303 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-23 16:06:06,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 16:06:06,304 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:06,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:06,305 INFO L85 PathProgramCache]: Analyzing trace with hash 162187, now seen corresponding path program 1 times [2022-11-23 16:06:06,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:06,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753620071] [2022-11-23 16:06:06,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:06,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:06,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:06,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:06,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:06,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753620071] [2022-11-23 16:06:06,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753620071] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:06,660 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:06,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 16:06:06,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072828114] [2022-11-23 16:06:06,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:06,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 16:06:06,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:06,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 16:06:06,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 16:06:06,663 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:06,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:06,844 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-11-23 16:06:06,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:06:06,844 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 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 3 [2022-11-23 16:06:06,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:06,846 INFO L225 Difference]: With dead ends: 70 [2022-11-23 16:06:06,846 INFO L226 Difference]: Without dead ends: 70 [2022-11-23 16:06:06,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:06,847 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 38 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:06,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 55 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:06,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-23 16:06:06,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2022-11-23 16:06:06,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 37 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) [2022-11-23 16:06:06,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-11-23 16:06:06,859 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2022-11-23 16:06:06,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:06,860 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-11-23 16:06:06,860 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:06,860 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-11-23 16:06:06,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-23 16:06:06,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:06,861 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-23 16:06:06,861 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 16:06:06,862 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:06,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:06,862 INFO L85 PathProgramCache]: Analyzing trace with hash 5136908, now seen corresponding path program 1 times [2022-11-23 16:06:06,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:06,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106779766] [2022-11-23 16:06:06,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:06,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:07,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:07,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:07,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106779766] [2022-11-23 16:06:07,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106779766] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:07,108 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:07,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-23 16:06:07,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026226039] [2022-11-23 16:06:07,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:07,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 16:06:07,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:07,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 16:06:07,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 16:06:07,112 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:07,187 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-11-23 16:06:07,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 16:06:07,188 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-23 16:06:07,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:07,190 INFO L225 Difference]: With dead ends: 37 [2022-11-23 16:06:07,190 INFO L226 Difference]: Without dead ends: 37 [2022-11-23 16:06:07,190 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 [2022-11-23 16:06:07,192 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:07,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:07,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-23 16:06:07,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-11-23 16:06:07,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-11-23 16:06:07,197 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2022-11-23 16:06:07,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:07,197 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-11-23 16:06:07,197 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,198 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-11-23 16:06:07,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-23 16:06:07,198 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:07,198 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-23 16:06:07,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 16:06:07,199 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:07,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:07,199 INFO L85 PathProgramCache]: Analyzing trace with hash 5134015, now seen corresponding path program 1 times [2022-11-23 16:06:07,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:07,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820302548] [2022-11-23 16:06:07,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:07,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:07,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:07,284 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:07,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:07,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820302548] [2022-11-23 16:06:07,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820302548] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:07,285 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:07,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-23 16:06:07,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215124237] [2022-11-23 16:06:07,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:07,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 16:06:07,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:07,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 16:06:07,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 16:06:07,287 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:07,367 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-11-23 16:06:07,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 16:06:07,368 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-23 16:06:07,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:07,368 INFO L225 Difference]: With dead ends: 35 [2022-11-23 16:06:07,368 INFO L226 Difference]: Without dead ends: 35 [2022-11-23 16:06:07,369 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 [2022-11-23 16:06:07,370 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:07,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:07,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-23 16:06:07,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-11-23 16:06:07,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2022-11-23 16:06:07,374 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2022-11-23 16:06:07,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:07,375 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2022-11-23 16:06:07,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,375 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2022-11-23 16:06:07,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-23 16:06:07,376 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:07,376 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-23 16:06:07,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 16:06:07,376 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:07,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:07,377 INFO L85 PathProgramCache]: Analyzing trace with hash 5134016, now seen corresponding path program 1 times [2022-11-23 16:06:07,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:07,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658459105] [2022-11-23 16:06:07,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:07,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:07,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:07,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:07,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:07,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658459105] [2022-11-23 16:06:07,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658459105] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:07,628 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:07,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:07,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662315516] [2022-11-23 16:06:07,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:07,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:06:07,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:07,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:06:07,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:07,633 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:07,773 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2022-11-23 16:06:07,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 16:06:07,774 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-23 16:06:07,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:07,778 INFO L225 Difference]: With dead ends: 63 [2022-11-23 16:06:07,778 INFO L226 Difference]: Without dead ends: 63 [2022-11-23 16:06:07,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-23 16:06:07,780 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 69 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:07,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:07,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-23 16:06:07,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 37. [2022-11-23 16:06:07,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 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) [2022-11-23 16:06:07,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-11-23 16:06:07,792 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2022-11-23 16:06:07,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:07,793 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-11-23 16:06:07,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:07,793 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-11-23 16:06:07,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-23 16:06:07,799 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:07,799 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-23 16:06:07,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 16:06:07,800 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:07,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:07,800 INFO L85 PathProgramCache]: Analyzing trace with hash 159244142, now seen corresponding path program 1 times [2022-11-23 16:06:07,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:07,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36517198] [2022-11-23 16:06:07,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:07,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:07,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:08,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:08,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:08,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36517198] [2022-11-23 16:06:08,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36517198] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:08,103 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:08,103 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:08,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607197144] [2022-11-23 16:06:08,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:08,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:06:08,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:08,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:06:08,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:08,106 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:08,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:08,206 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2022-11-23 16:06:08,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 16:06:08,207 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-23 16:06:08,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:08,208 INFO L225 Difference]: With dead ends: 62 [2022-11-23 16:06:08,208 INFO L226 Difference]: Without dead ends: 62 [2022-11-23 16:06:08,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:08,210 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:08,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:08,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-23 16:06:08,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 39. [2022-11-23 16:06:08,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.84) internal successors, (46), 38 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) [2022-11-23 16:06:08,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2022-11-23 16:06:08,215 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 5 [2022-11-23 16:06:08,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:08,215 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2022-11-23 16:06:08,216 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:08,216 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2022-11-23 16:06:08,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-23 16:06:08,216 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:08,217 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-23 16:06:08,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-23 16:06:08,217 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:08,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:08,218 INFO L85 PathProgramCache]: Analyzing trace with hash 155961429, now seen corresponding path program 1 times [2022-11-23 16:06:08,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:08,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142159462] [2022-11-23 16:06:08,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:08,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:08,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:08,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:08,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:08,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142159462] [2022-11-23 16:06:08,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142159462] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:08,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855304164] [2022-11-23 16:06:08,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:08,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:08,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:08,455 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:08,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 16:06:08,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:08,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-23 16:06:08,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:08,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:08,707 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 11 treesize of output 13 [2022-11-23 16:06:08,718 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 18 treesize of output 16 [2022-11-23 16:06:08,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:08,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:09,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:09,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855304164] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:09,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1579883993] [2022-11-23 16:06:09,030 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-23 16:06:09,031 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:09,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:09,043 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:09,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:09,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:09,113 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:09,172 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 7 [2022-11-23 16:06:09,286 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 14 treesize of output 10 [2022-11-23 16:06:09,337 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 14 treesize of output 10 [2022-11-23 16:06:09,379 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:09,741 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '630#(and (not (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|))) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_#t~nondet15#1| 127) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:09,741 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:09,741 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:09,741 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-23 16:06:09,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104961795] [2022-11-23 16:06:09,742 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:09,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 16:06:09,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:09,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 16:06:09,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-11-23 16:06:09,743 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:10,165 INFO L93 Difference]: Finished difference Result 105 states and 123 transitions. [2022-11-23 16:06:10,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 16:06:10,166 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-23 16:06:10,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:10,166 INFO L225 Difference]: With dead ends: 105 [2022-11-23 16:06:10,167 INFO L226 Difference]: Without dead ends: 105 [2022-11-23 16:06:10,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2022-11-23 16:06:10,168 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 172 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:10,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 224 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 16:06:10,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-11-23 16:06:10,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 36. [2022-11-23 16:06:10,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.826086956521739) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2022-11-23 16:06:10,173 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 5 [2022-11-23 16:06:10,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:10,173 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2022-11-23 16:06:10,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,173 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2022-11-23 16:06:10,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 16:06:10,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:10,174 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 16:06:10,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 16:06:10,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:10,379 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:10,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:10,380 INFO L85 PathProgramCache]: Analyzing trace with hash 641603338, now seen corresponding path program 1 times [2022-11-23 16:06:10,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:10,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424552335] [2022-11-23 16:06:10,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:10,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:10,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:10,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:10,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:10,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424552335] [2022-11-23 16:06:10,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424552335] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:10,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:10,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:10,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003444784] [2022-11-23 16:06:10,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:10,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 16:06:10,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:10,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 16:06:10,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 16:06:10,423 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:10,461 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-11-23 16:06:10,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:06:10,462 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 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 [2022-11-23 16:06:10,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:10,462 INFO L225 Difference]: With dead ends: 34 [2022-11-23 16:06:10,462 INFO L226 Difference]: Without dead ends: 34 [2022-11-23 16:06:10,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:10,463 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:10,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 20 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:06:10,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-23 16:06:10,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-11-23 16:06:10,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 33 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) [2022-11-23 16:06:10,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-11-23 16:06:10,467 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 6 [2022-11-23 16:06:10,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:10,467 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-11-23 16:06:10,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,467 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-11-23 16:06:10,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 16:06:10,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:10,468 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 16:06:10,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-23 16:06:10,468 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:10,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:10,468 INFO L85 PathProgramCache]: Analyzing trace with hash 641603339, now seen corresponding path program 1 times [2022-11-23 16:06:10,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:10,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614955138] [2022-11-23 16:06:10,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:10,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:10,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:10,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:10,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614955138] [2022-11-23 16:06:10,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614955138] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:10,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:10,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:10,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379756695] [2022-11-23 16:06:10,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:10,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:06:10,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:10,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:06:10,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:10,548 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:10,613 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2022-11-23 16:06:10,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:06:10,614 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 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 [2022-11-23 16:06:10,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:10,614 INFO L225 Difference]: With dead ends: 53 [2022-11-23 16:06:10,615 INFO L226 Difference]: Without dead ends: 53 [2022-11-23 16:06:10,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-23 16:06:10,615 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 130 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:10,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 26 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:10,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-23 16:06:10,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 37. [2022-11-23 16:06:10,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 36 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) [2022-11-23 16:06:10,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-11-23 16:06:10,619 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 6 [2022-11-23 16:06:10,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:10,619 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-11-23 16:06:10,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:10,619 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-11-23 16:06:10,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 16:06:10,620 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:10,620 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-11-23 16:06:10,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 16:06:10,620 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:10,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:10,622 INFO L85 PathProgramCache]: Analyzing trace with hash 638899314, now seen corresponding path program 1 times [2022-11-23 16:06:10,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:10,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6854758] [2022-11-23 16:06:10,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:10,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:10,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:10,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:10,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6854758] [2022-11-23 16:06:10,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6854758] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:10,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787235247] [2022-11-23 16:06:10,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:10,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:10,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:10,833 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:10,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 16:06:10,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:10,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-23 16:06:10,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:10,957 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-23 16:06:10,957 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 11 treesize of output 17 [2022-11-23 16:06:11,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:11,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:11,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:11,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787235247] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:11,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [284940891] [2022-11-23 16:06:11,378 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-23 16:06:11,378 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:11,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:11,378 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:11,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:11,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:11,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:11,464 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 7 [2022-11-23 16:06:11,525 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 14 treesize of output 10 [2022-11-23 16:06:11,551 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:12,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '995#(and (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet17#1|)) (not (<= (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|))) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_main_#t~nondet17#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (< (+ |ULTIMATE.start_main_~i~1#1| 1) |ULTIMATE.start_main_~length2~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:12,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:12,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:12,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-11-23 16:06:12,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320066011] [2022-11-23 16:06:12,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:12,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 16:06:12,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:12,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 16:06:12,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2022-11-23 16:06:12,198 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:12,521 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2022-11-23 16:06:12,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 16:06:12,521 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 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 [2022-11-23 16:06:12,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:12,522 INFO L225 Difference]: With dead ends: 86 [2022-11-23 16:06:12,522 INFO L226 Difference]: Without dead ends: 86 [2022-11-23 16:06:12,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2022-11-23 16:06:12,523 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 231 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:12,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 149 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 16:06:12,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-23 16:06:12,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 31. [2022-11-23 16:06:12,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-11-23 16:06:12,526 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2022-11-23 16:06:12,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:12,527 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-11-23 16:06:12,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,527 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-11-23 16:06:12,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 16:06:12,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:12,527 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:12,541 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-11-23 16:06:12,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:12,735 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:12,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:12,736 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614513, now seen corresponding path program 1 times [2022-11-23 16:06:12,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:12,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695533033] [2022-11-23 16:06:12,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:12,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:12,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:12,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:12,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:12,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695533033] [2022-11-23 16:06:12,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695533033] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:12,791 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:12,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:12,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125328418] [2022-11-23 16:06:12,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:12,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 16:06:12,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:12,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 16:06:12,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 16:06:12,793 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:12,842 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2022-11-23 16:06:12,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:06:12,843 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 16:06:12,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:12,843 INFO L225 Difference]: With dead ends: 30 [2022-11-23 16:06:12,843 INFO L226 Difference]: Without dead ends: 30 [2022-11-23 16:06:12,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:12,844 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 34 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:12,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:06:12,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-23 16:06:12,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-23 16:06:12,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 27 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-11-23 16:06:12,847 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 9 [2022-11-23 16:06:12,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:12,848 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-11-23 16:06:12,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:12,848 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-11-23 16:06:12,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-23 16:06:12,849 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:12,849 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:12,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-23 16:06:12,849 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:12,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:12,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614514, now seen corresponding path program 1 times [2022-11-23 16:06:12,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:12,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91459049] [2022-11-23 16:06:12,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:12,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:12,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:12,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:12,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:12,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91459049] [2022-11-23 16:06:12,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91459049] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:12,983 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:12,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:12,983 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952618693] [2022-11-23 16:06:12,983 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:12,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:06:12,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:12,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:06:12,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:12,985 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:13,069 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2022-11-23 16:06:13,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 16:06:13,069 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-23 16:06:13,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:13,070 INFO L225 Difference]: With dead ends: 41 [2022-11-23 16:06:13,070 INFO L226 Difference]: Without dead ends: 41 [2022-11-23 16:06:13,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-23 16:06:13,071 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 81 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:13,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 23 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:13,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-23 16:06:13,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2022-11-23 16:06:13,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 32 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2022-11-23 16:06:13,073 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 9 [2022-11-23 16:06:13,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:13,074 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2022-11-23 16:06:13,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,074 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2022-11-23 16:06:13,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-23 16:06:13,074 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:13,074 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:13,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-23 16:06:13,075 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:13,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:13,075 INFO L85 PathProgramCache]: Analyzing trace with hash 469310905, now seen corresponding path program 1 times [2022-11-23 16:06:13,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:13,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236486506] [2022-11-23 16:06:13,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:13,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:13,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:13,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:13,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:13,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236486506] [2022-11-23 16:06:13,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236486506] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:13,316 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:13,316 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:13,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764126399] [2022-11-23 16:06:13,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:13,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 16:06:13,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:13,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 16:06:13,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:13,318 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:13,347 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-23 16:06:13,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 16:06:13,348 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-11-23 16:06:13,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:13,348 INFO L225 Difference]: With dead ends: 32 [2022-11-23 16:06:13,349 INFO L226 Difference]: Without dead ends: 29 [2022-11-23 16:06:13,349 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 16:06:13,351 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:13,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 30 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:06:13,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-23 16:06:13,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-23 16:06:13,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-11-23 16:06:13,358 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 10 [2022-11-23 16:06:13,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:13,358 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-11-23 16:06:13,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,359 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-11-23 16:06:13,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-23 16:06:13,359 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:13,359 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:13,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-23 16:06:13,360 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:13,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:13,360 INFO L85 PathProgramCache]: Analyzing trace with hash 101075500, now seen corresponding path program 1 times [2022-11-23 16:06:13,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:13,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298877013] [2022-11-23 16:06:13,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:13,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:13,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:13,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:13,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:13,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298877013] [2022-11-23 16:06:13,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298877013] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:13,394 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:13,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 16:06:13,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122978800] [2022-11-23 16:06:13,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:13,397 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 16:06:13,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:13,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 16:06:13,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 16:06:13,400 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:13,422 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2022-11-23 16:06:13,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 16:06:13,422 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-23 16:06:13,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:13,423 INFO L225 Difference]: With dead ends: 31 [2022-11-23 16:06:13,423 INFO L226 Difference]: Without dead ends: 31 [2022-11-23 16:06:13,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 16:06:13,424 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:13,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:06:13,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-23 16:06:13,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-11-23 16:06:13,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-11-23 16:06:13,431 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 12 [2022-11-23 16:06:13,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:13,431 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-11-23 16:06:13,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,432 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-11-23 16:06:13,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 16:06:13,432 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:13,433 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:13,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-23 16:06:13,433 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:13,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:13,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1161774215, now seen corresponding path program 1 times [2022-11-23 16:06:13,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:13,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889777280] [2022-11-23 16:06:13,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:13,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:13,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:13,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:13,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:13,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889777280] [2022-11-23 16:06:13,714 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889777280] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:13,714 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:13,714 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 16:06:13,714 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618273006] [2022-11-23 16:06:13,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:13,715 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 16:06:13,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:13,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 16:06:13,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-23 16:06:13,716 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:13,846 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2022-11-23 16:06:13,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 16:06:13,847 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-23 16:06:13,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:13,847 INFO L225 Difference]: With dead ends: 39 [2022-11-23 16:06:13,847 INFO L226 Difference]: Without dead ends: 33 [2022-11-23 16:06:13,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-23 16:06:13,848 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:13,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 69 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:13,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-23 16:06:13,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-11-23 16:06:13,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 31 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2022-11-23 16:06:13,851 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 13 [2022-11-23 16:06:13,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:13,851 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2022-11-23 16:06:13,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:13,852 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2022-11-23 16:06:13,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 16:06:13,852 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:13,852 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:13,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-23 16:06:13,853 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:13,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:13,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1481271869, now seen corresponding path program 1 times [2022-11-23 16:06:13,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:13,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667362189] [2022-11-23 16:06:13,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:13,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:13,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:14,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:14,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:14,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667362189] [2022-11-23 16:06:14,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667362189] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:14,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:14,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-23 16:06:14,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752578561] [2022-11-23 16:06:14,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:14,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:06:14,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:14,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:06:14,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-23 16:06:14,093 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:14,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:14,235 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-11-23 16:06:14,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 16:06:14,236 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 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 15 [2022-11-23 16:06:14,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:14,236 INFO L225 Difference]: With dead ends: 49 [2022-11-23 16:06:14,236 INFO L226 Difference]: Without dead ends: 49 [2022-11-23 16:06:14,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2022-11-23 16:06:14,237 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 70 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:14,238 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 56 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:14,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-23 16:06:14,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2022-11-23 16:06:14,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 45 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) [2022-11-23 16:06:14,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2022-11-23 16:06:14,240 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 15 [2022-11-23 16:06:14,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:14,240 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2022-11-23 16:06:14,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:14,240 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2022-11-23 16:06:14,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 16:06:14,240 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:14,241 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:14,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-23 16:06:14,241 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:14,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:14,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1329745851, now seen corresponding path program 1 times [2022-11-23 16:06:14,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:14,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656947526] [2022-11-23 16:06:14,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:14,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:14,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:14,345 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:14,345 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:14,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656947526] [2022-11-23 16:06:14,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656947526] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:06:14,346 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:06:14,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 16:06:14,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156593753] [2022-11-23 16:06:14,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:06:14,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:06:14,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:14,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:06:14,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-23 16:06:14,348 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:14,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:14,469 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-11-23 16:06:14,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 16:06:14,470 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 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 16 [2022-11-23 16:06:14,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:14,470 INFO L225 Difference]: With dead ends: 47 [2022-11-23 16:06:14,470 INFO L226 Difference]: Without dead ends: 34 [2022-11-23 16:06:14,470 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2022-11-23 16:06:14,471 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 39 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:14,471 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 36 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:14,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-23 16:06:14,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-11-23 16:06:14,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:14,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2022-11-23 16:06:14,473 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2022-11-23 16:06:14,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:14,473 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2022-11-23 16:06:14,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:14,473 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2022-11-23 16:06:14,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 16:06:14,474 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:14,474 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:14,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-23 16:06:14,474 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:14,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:14,474 INFO L85 PathProgramCache]: Analyzing trace with hash -298912303, now seen corresponding path program 1 times [2022-11-23 16:06:14,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:14,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149406008] [2022-11-23 16:06:14,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:14,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:14,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:14,748 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:14,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:14,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149406008] [2022-11-23 16:06:14,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149406008] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:14,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057347212] [2022-11-23 16:06:14,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:14,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:14,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:14,750 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:14,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 16:06:14,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:14,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 16:06:14,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:14,953 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:14,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:15,060 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 5 treesize of output 3 [2022-11-23 16:06:15,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:15,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057347212] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:15,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [530269329] [2022-11-23 16:06:15,087 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:06:15,088 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:15,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:15,088 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:15,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:15,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:15,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:15,178 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 14 treesize of output 10 [2022-11-23 16:06:15,229 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 14 treesize of output 10 [2022-11-23 16:06:15,253 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 14 treesize of output 10 [2022-11-23 16:06:15,323 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 14 treesize of output 10 [2022-11-23 16:06:15,380 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 14 treesize of output 10 [2022-11-23 16:06:15,449 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 14 treesize of output 10 [2022-11-23 16:06:15,479 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 14 treesize of output 10 [2022-11-23 16:06:15,538 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 14 treesize of output 10 [2022-11-23 16:06:15,601 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:06:15,602 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 25 treesize of output 24 [2022-11-23 16:06:15,906 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:18,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1807#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:18,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:18,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:18,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2022-11-23 16:06:18,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263301533] [2022-11-23 16:06:18,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:18,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-23 16:06:18,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:18,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-23 16:06:18,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=851, Unknown=0, NotChecked=0, Total=992 [2022-11-23 16:06:18,490 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:18,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:18,755 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-11-23 16:06:18,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 16:06:18,756 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 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 [2022-11-23 16:06:18,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:18,757 INFO L225 Difference]: With dead ends: 47 [2022-11-23 16:06:18,757 INFO L226 Difference]: Without dead ends: 43 [2022-11-23 16:06:18,757 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=202, Invalid=1130, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 16:06:18,758 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 263 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:18,758 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [263 Valid, 28 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:18,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-23 16:06:18,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2022-11-23 16:06:18,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:18,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-11-23 16:06:18,760 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2022-11-23 16:06:18,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:18,760 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-11-23 16:06:18,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:18,760 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-11-23 16:06:18,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 16:06:18,761 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:18,761 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:18,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-23 16:06:18,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 16:06:18,969 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:18,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:18,970 INFO L85 PathProgramCache]: Analyzing trace with hash 508049194, now seen corresponding path program 1 times [2022-11-23 16:06:18,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:18,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045125972] [2022-11-23 16:06:18,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:18,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:18,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:19,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:19,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:19,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045125972] [2022-11-23 16:06:19,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045125972] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:19,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273063824] [2022-11-23 16:06:19,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:19,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:19,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:19,183 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:19,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 16:06:19,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:19,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-23 16:06:19,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:19,395 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:19,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:19,531 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 5 treesize of output 3 [2022-11-23 16:06:19,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:19,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273063824] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:19,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729812118] [2022-11-23 16:06:19,564 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:06:19,564 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:19,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:19,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:19,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:19,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:19,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:19,644 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 7 [2022-11-23 16:06:19,696 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 14 treesize of output 10 [2022-11-23 16:06:19,738 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 14 treesize of output 10 [2022-11-23 16:06:19,805 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 7 [2022-11-23 16:06:19,886 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:06:19,887 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 90 treesize of output 89 [2022-11-23 16:06:19,954 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 14 treesize of output 10 [2022-11-23 16:06:19,980 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 14 treesize of output 10 [2022-11-23 16:06:20,114 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:06:20,114 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 177 treesize of output 181 [2022-11-23 16:06:20,338 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:06:20,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:06:22,824 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:26,298 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2032#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:26,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:26,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:26,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2022-11-23 16:06:26,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683025124] [2022-11-23 16:06:26,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:26,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-23 16:06:26,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:26,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-23 16:06:26,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-11-23 16:06:26,301 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:26,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:26,514 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2022-11-23 16:06:26,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 16:06:26,515 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-23 16:06:26,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:26,515 INFO L225 Difference]: With dead ends: 56 [2022-11-23 16:06:26,515 INFO L226 Difference]: Without dead ends: 56 [2022-11-23 16:06:26,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 16:06:26,517 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 195 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:26,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 45 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:26,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-23 16:06:26,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2022-11-23 16:06:26,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.236842105263158) internal successors, (47), 39 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) [2022-11-23 16:06:26,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2022-11-23 16:06:26,519 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2022-11-23 16:06:26,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:26,520 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2022-11-23 16:06:26,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:26,520 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2022-11-23 16:06:26,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-23 16:06:26,521 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:26,521 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:26,531 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 16:06:26,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:26,722 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:26,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:26,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1313653928, now seen corresponding path program 2 times [2022-11-23 16:06:26,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:26,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99522385] [2022-11-23 16:06:26,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:26,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:26,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:27,196 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:27,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:27,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99522385] [2022-11-23 16:06:27,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99522385] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:27,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029924145] [2022-11-23 16:06:27,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:06:27,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:27,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:27,200 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:27,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 16:06:27,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 16:06:27,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:06:27,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-23 16:06:27,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:27,392 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 14 treesize of output 10 [2022-11-23 16:06:27,605 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:27,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:27,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:06:27,701 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 16 treesize of output 12 [2022-11-23 16:06:27,796 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:27,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029924145] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:27,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [78195949] [2022-11-23 16:06:27,798 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:06:27,798 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:27,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:27,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:27,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:27,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:27,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:27,886 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 7 [2022-11-23 16:06:27,966 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 14 treesize of output 10 [2022-11-23 16:06:28,026 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 14 treesize of output 10 [2022-11-23 16:06:28,097 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 7 [2022-11-23 16:06:28,158 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:06:28,159 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 90 treesize of output 89 [2022-11-23 16:06:28,224 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 14 treesize of output 10 [2022-11-23 16:06:28,251 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 14 treesize of output 10 [2022-11-23 16:06:28,355 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:06:28,356 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 177 treesize of output 181 [2022-11-23 16:06:28,602 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:06:28,602 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:06:29,967 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:34,107 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2298#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:34,108 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:34,108 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:34,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2022-11-23 16:06:34,113 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219940635] [2022-11-23 16:06:34,113 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:34,114 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 16:06:34,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:34,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 16:06:34,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2022-11-23 16:06:34,116 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:34,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:34,496 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2022-11-23 16:06:34,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 16:06:34,497 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 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 21 [2022-11-23 16:06:34,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:34,497 INFO L225 Difference]: With dead ends: 69 [2022-11-23 16:06:34,497 INFO L226 Difference]: Without dead ends: 65 [2022-11-23 16:06:34,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=265, Invalid=1805, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 16:06:34,499 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 127 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:34,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 76 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:06:34,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-23 16:06:34,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-11-23 16:06:34,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 61 states have (on average 1.180327868852459) internal successors, (72), 62 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:34,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-11-23 16:06:34,502 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 21 [2022-11-23 16:06:34,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:34,502 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-11-23 16:06:34,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:34,502 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-11-23 16:06:34,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 16:06:34,503 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:34,503 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:34,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 16:06:34,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:34,709 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:34,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:34,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1271146266, now seen corresponding path program 3 times [2022-11-23 16:06:34,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:34,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352251319] [2022-11-23 16:06:34,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:34,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:34,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:35,076 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:35,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:35,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352251319] [2022-11-23 16:06:35,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352251319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:35,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888738012] [2022-11-23 16:06:35,076 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:06:35,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:35,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:35,079 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:35,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 16:06:35,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:06:35,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:06:35,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-23 16:06:35,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:35,210 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:06:35,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:06:35,335 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:35,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:35,571 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:35,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888738012] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:35,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [758252384] [2022-11-23 16:06:35,573 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:06:35,573 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:35,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:35,573 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:35,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:35,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:35,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:35,643 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 7 [2022-11-23 16:06:35,690 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 14 treesize of output 10 [2022-11-23 16:06:35,727 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 14 treesize of output 10 [2022-11-23 16:06:35,773 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 7 [2022-11-23 16:06:35,835 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:06:35,836 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 90 treesize of output 89 [2022-11-23 16:06:35,889 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 14 treesize of output 10 [2022-11-23 16:06:35,921 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 14 treesize of output 10 [2022-11-23 16:06:36,062 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:06:36,063 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 177 treesize of output 181 [2022-11-23 16:06:36,245 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:06:36,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:06:37,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:41,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2614#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:41,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:41,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:41,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2022-11-23 16:06:41,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172438838] [2022-11-23 16:06:41,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:41,501 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-23 16:06:41,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:41,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-23 16:06:41,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1235, Unknown=0, NotChecked=0, Total=1406 [2022-11-23 16:06:41,502 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:41,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:41,949 INFO L93 Difference]: Finished difference Result 102 states and 114 transitions. [2022-11-23 16:06:41,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 16:06:41,949 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 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 23 [2022-11-23 16:06:41,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:41,951 INFO L225 Difference]: With dead ends: 102 [2022-11-23 16:06:41,951 INFO L226 Difference]: Without dead ends: 102 [2022-11-23 16:06:41,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=290, Invalid=1690, Unknown=0, NotChecked=0, Total=1980 [2022-11-23 16:06:41,952 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 340 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:41,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 60 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 16:06:41,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-23 16:06:41,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 71. [2022-11-23 16:06:41,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 70 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:41,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2022-11-23 16:06:41,959 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 23 [2022-11-23 16:06:41,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:41,959 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2022-11-23 16:06:41,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:41,960 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2022-11-23 16:06:41,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-23 16:06:41,960 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:41,961 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:41,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 16:06:42,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:42,166 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:42,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:42,167 INFO L85 PathProgramCache]: Analyzing trace with hash 297700333, now seen corresponding path program 4 times [2022-11-23 16:06:42,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:42,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933066830] [2022-11-23 16:06:42,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:42,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:42,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:43,491 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:43,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:43,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933066830] [2022-11-23 16:06:43,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933066830] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:43,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309832124] [2022-11-23 16:06:43,492 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:06:43,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:43,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:43,493 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:43,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 16:06:43,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:43,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-23 16:06:43,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:43,756 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 14 treesize of output 10 [2022-11-23 16:06:43,939 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:43,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:44,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:06:44,040 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 16 treesize of output 12 [2022-11-23 16:06:44,182 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:44,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309832124] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:44,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006692940] [2022-11-23 16:06:44,184 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:06:44,184 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:44,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:44,185 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:44,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:44,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:44,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:44,267 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 14 treesize of output 10 [2022-11-23 16:06:44,311 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 14 treesize of output 10 [2022-11-23 16:06:44,339 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 14 treesize of output 10 [2022-11-23 16:06:44,414 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 14 treesize of output 10 [2022-11-23 16:06:44,455 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 14 treesize of output 10 [2022-11-23 16:06:44,503 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 14 treesize of output 10 [2022-11-23 16:06:44,526 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 14 treesize of output 10 [2022-11-23 16:06:44,564 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 14 treesize of output 10 [2022-11-23 16:06:44,619 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:06:44,620 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 25 treesize of output 24 [2022-11-23 16:06:44,872 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:48,524 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2998#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:48,524 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:48,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:48,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 27 [2022-11-23 16:06:48,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276935357] [2022-11-23 16:06:48,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:48,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 16:06:48,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:48,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 16:06:48,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1498, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 16:06:48,526 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:50,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:06:50,555 INFO L93 Difference]: Finished difference Result 233 states and 259 transitions. [2022-11-23 16:06:50,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-23 16:06:50,556 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-11-23 16:06:50,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:06:50,559 INFO L225 Difference]: With dead ends: 233 [2022-11-23 16:06:50,559 INFO L226 Difference]: Without dead ends: 225 [2022-11-23 16:06:50,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=372, Invalid=3168, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 16:06:50,562 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 325 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 16:06:50,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 111 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 16:06:50,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-11-23 16:06:50,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 102. [2022-11-23 16:06:50,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.17) internal successors, (117), 101 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:50,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2022-11-23 16:06:50,573 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 27 [2022-11-23 16:06:50,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:06:50,574 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2022-11-23 16:06:50,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:06:50,574 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2022-11-23 16:06:50,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-23 16:06:50,580 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:06:50,580 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:06:50,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-23 16:06:50,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 16:06:50,786 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:06:50,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:06:50,786 INFO L85 PathProgramCache]: Analyzing trace with hash 1136510355, now seen corresponding path program 2 times [2022-11-23 16:06:50,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:06:50,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838058961] [2022-11-23 16:06:50,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:06:50,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:06:50,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:06:51,265 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:06:51,265 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:06:51,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838058961] [2022-11-23 16:06:51,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838058961] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:06:51,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682108712] [2022-11-23 16:06:51,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:06:51,265 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:06:51,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:06:51,267 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:06:51,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 16:06:51,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 16:06:51,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:06:51,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-23 16:06:51,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:06:51,418 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:06:51,419 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:06:51,611 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 14 treesize of output 10 [2022-11-23 16:06:51,701 INFO L321 Elim1Store]: treesize reduction 42, result has 19.2 percent of original size [2022-11-23 16:06:51,702 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 28 treesize of output 27 [2022-11-23 16:06:52,778 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:06:52,804 INFO L321 Elim1Store]: treesize reduction 26, result has 53.6 percent of original size [2022-11-23 16:06:52,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 46 treesize of output 46 [2022-11-23 16:06:53,169 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:53,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:06:53,874 INFO L321 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2022-11-23 16:06:53,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 356 treesize of output 312 [2022-11-23 16:06:54,436 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:06:54,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682108712] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:06:54,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2060013300] [2022-11-23 16:06:54,438 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:06:54,438 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:06:54,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:06:54,438 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:06:54,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:06:54,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:06:54,470 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:06:54,511 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 14 treesize of output 10 [2022-11-23 16:06:54,550 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 14 treesize of output 10 [2022-11-23 16:06:54,574 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 14 treesize of output 10 [2022-11-23 16:06:54,622 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 14 treesize of output 10 [2022-11-23 16:06:54,669 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 14 treesize of output 10 [2022-11-23 16:06:54,711 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 14 treesize of output 10 [2022-11-23 16:06:54,731 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 14 treesize of output 10 [2022-11-23 16:06:54,765 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 14 treesize of output 10 [2022-11-23 16:06:54,818 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:06:54,818 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 25 treesize of output 24 [2022-11-23 16:06:55,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:06:58,695 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3582#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:06:58,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:06:58,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:06:58,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13] total 34 [2022-11-23 16:06:58,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947703537] [2022-11-23 16:06:58,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:06:58,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 16:06:58,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:06:58,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 16:06:58,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2237, Unknown=0, NotChecked=0, Total=2450 [2022-11-23 16:06:58,698 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:00,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:00,074 INFO L93 Difference]: Finished difference Result 165 states and 185 transitions. [2022-11-23 16:07:00,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-23 16:07:00,075 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 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 28 [2022-11-23 16:07:00,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:00,076 INFO L225 Difference]: With dead ends: 165 [2022-11-23 16:07:00,076 INFO L226 Difference]: Without dead ends: 131 [2022-11-23 16:07:00,078 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=378, Invalid=3404, Unknown=0, NotChecked=0, Total=3782 [2022-11-23 16:07:00,078 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 145 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:00,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [145 Valid, 67 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:07:00,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-11-23 16:07:00,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 129. [2022-11-23 16:07:00,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 127 states have (on average 1.1574803149606299) internal successors, (147), 128 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:00,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 147 transitions. [2022-11-23 16:07:00,083 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 147 transitions. Word has length 28 [2022-11-23 16:07:00,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:00,083 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 147 transitions. [2022-11-23 16:07:00,083 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:00,083 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 147 transitions. [2022-11-23 16:07:00,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 16:07:00,084 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:00,084 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:00,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:00,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:00,290 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:00,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:00,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1739438341, now seen corresponding path program 5 times [2022-11-23 16:07:00,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:00,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346027693] [2022-11-23 16:07:00,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:00,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:00,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:00,691 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:00,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:00,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346027693] [2022-11-23 16:07:00,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346027693] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:00,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212772335] [2022-11-23 16:07:00,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:07:00,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:00,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:00,695 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:00,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 16:07:00,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 16:07:00,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:07:00,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 16:07:00,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:01,051 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:01,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:01,248 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 7 treesize of output 5 [2022-11-23 16:07:01,310 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:01,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212772335] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:01,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [293658694] [2022-11-23 16:07:01,311 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:07:01,312 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:01,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:01,312 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:01,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:01,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:01,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:01,376 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 7 [2022-11-23 16:07:01,416 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 14 treesize of output 10 [2022-11-23 16:07:01,448 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 14 treesize of output 10 [2022-11-23 16:07:01,490 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 7 [2022-11-23 16:07:01,545 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:07:01,545 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 90 treesize of output 89 [2022-11-23 16:07:01,610 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 14 treesize of output 10 [2022-11-23 16:07:01,632 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 14 treesize of output 10 [2022-11-23 16:07:01,722 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:07:01,722 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 177 treesize of output 181 [2022-11-23 16:07:01,888 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:07:01,888 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:07:02,873 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:06,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4111#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:06,934 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:06,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:06,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 27 [2022-11-23 16:07:06,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283302689] [2022-11-23 16:07:06,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:06,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 16:07:06,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:06,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 16:07:06,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1530, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 16:07:06,936 INFO L87 Difference]: Start difference. First operand 129 states and 147 transitions. Second operand has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:07,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:07,599 INFO L93 Difference]: Finished difference Result 184 states and 204 transitions. [2022-11-23 16:07:07,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 16:07:07,600 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 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 29 [2022-11-23 16:07:07,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:07,601 INFO L225 Difference]: With dead ends: 184 [2022-11-23 16:07:07,601 INFO L226 Difference]: Without dead ends: 184 [2022-11-23 16:07:07,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=352, Invalid=2198, Unknown=0, NotChecked=0, Total=2550 [2022-11-23 16:07:07,602 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 326 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:07,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 103 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:07:07,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-11-23 16:07:07,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 141. [2022-11-23 16:07:07,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 139 states have (on average 1.158273381294964) internal successors, (161), 140 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:07,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 161 transitions. [2022-11-23 16:07:07,607 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 161 transitions. Word has length 29 [2022-11-23 16:07:07,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:07,607 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 161 transitions. [2022-11-23 16:07:07,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:07,607 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 161 transitions. [2022-11-23 16:07:07,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-23 16:07:07,617 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:07,618 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:07,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:07,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:07,830 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:07,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:07,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1151087095, now seen corresponding path program 3 times [2022-11-23 16:07:07,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:07,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61924472] [2022-11-23 16:07:07,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:07,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:07,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:08,094 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:08,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:08,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61924472] [2022-11-23 16:07:08,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61924472] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:08,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1640123180] [2022-11-23 16:07:08,095 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:07:08,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:08,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:08,098 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:08,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 16:07:08,221 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:07:08,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:07:08,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-23 16:07:08,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:08,371 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:08,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:08,543 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 5 treesize of output 3 [2022-11-23 16:07:08,586 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:08,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1640123180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:08,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1457451696] [2022-11-23 16:07:08,588 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:07:08,588 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:08,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:08,589 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:08,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:08,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:08,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:08,649 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 7 [2022-11-23 16:07:08,685 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 14 treesize of output 10 [2022-11-23 16:07:08,717 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 14 treesize of output 10 [2022-11-23 16:07:08,764 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 7 [2022-11-23 16:07:08,819 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:07:08,820 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 90 treesize of output 89 [2022-11-23 16:07:08,878 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 14 treesize of output 10 [2022-11-23 16:07:08,910 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 14 treesize of output 10 [2022-11-23 16:07:09,003 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:07:09,004 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 177 treesize of output 181 [2022-11-23 16:07:09,171 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:07:09,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:07:10,652 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:14,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4662#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:14,192 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:14,192 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:14,192 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 18 [2022-11-23 16:07:14,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781125397] [2022-11-23 16:07:14,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:14,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 16:07:14,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:14,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 16:07:14,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 16:07:14,194 INFO L87 Difference]: Start difference. First operand 141 states and 161 transitions. Second operand has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:14,484 INFO L93 Difference]: Finished difference Result 230 states and 258 transitions. [2022-11-23 16:07:14,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-23 16:07:14,485 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 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 30 [2022-11-23 16:07:14,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:14,486 INFO L225 Difference]: With dead ends: 230 [2022-11-23 16:07:14,486 INFO L226 Difference]: Without dead ends: 230 [2022-11-23 16:07:14,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=243, Invalid=1479, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 16:07:14,487 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 264 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:14,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 94 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 16:07:14,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-11-23 16:07:14,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 185. [2022-11-23 16:07:14,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 183 states have (on average 1.1530054644808743) internal successors, (211), 184 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:14,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 211 transitions. [2022-11-23 16:07:14,493 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 211 transitions. Word has length 30 [2022-11-23 16:07:14,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:14,494 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 211 transitions. [2022-11-23 16:07:14,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:14,494 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 211 transitions. [2022-11-23 16:07:14,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-23 16:07:14,495 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:14,495 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:14,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:14,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:14,701 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:14,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:14,701 INFO L85 PathProgramCache]: Analyzing trace with hash 169207682, now seen corresponding path program 6 times [2022-11-23 16:07:14,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:14,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533714555] [2022-11-23 16:07:14,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:14,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:14,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:15,181 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:15,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:15,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533714555] [2022-11-23 16:07:15,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533714555] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:15,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1183708708] [2022-11-23 16:07:15,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:07:15,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:15,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:15,183 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:15,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 16:07:15,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:07:15,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:07:15,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-23 16:07:15,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:15,440 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 14 treesize of output 10 [2022-11-23 16:07:15,587 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:15,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:15,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:07:15,668 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 16 treesize of output 12 [2022-11-23 16:07:15,773 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:15,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1183708708] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:15,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2117010754] [2022-11-23 16:07:15,775 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:07:15,775 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:15,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:15,775 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:15,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:15,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:15,799 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:15,838 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 7 [2022-11-23 16:07:15,891 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 14 treesize of output 10 [2022-11-23 16:07:15,933 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 14 treesize of output 10 [2022-11-23 16:07:15,970 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 7 [2022-11-23 16:07:16,035 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:07:16,037 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 90 treesize of output 89 [2022-11-23 16:07:16,088 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 14 treesize of output 10 [2022-11-23 16:07:16,110 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 14 treesize of output 10 [2022-11-23 16:07:16,200 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:07:16,201 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 177 treesize of output 181 [2022-11-23 16:07:16,346 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:07:16,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:07:17,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:21,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5325#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:21,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:21,637 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:21,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2022-11-23 16:07:21,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440772334] [2022-11-23 16:07:21,637 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:21,638 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 16:07:21,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:21,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 16:07:21,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1480, Unknown=0, NotChecked=0, Total=1640 [2022-11-23 16:07:21,639 INFO L87 Difference]: Start difference. First operand 185 states and 211 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:22,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:22,341 INFO L93 Difference]: Finished difference Result 297 states and 328 transitions. [2022-11-23 16:07:22,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 16:07:22,341 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 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 33 [2022-11-23 16:07:22,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:22,343 INFO L225 Difference]: With dead ends: 297 [2022-11-23 16:07:22,343 INFO L226 Difference]: Without dead ends: 272 [2022-11-23 16:07:22,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=301, Invalid=2351, Unknown=0, NotChecked=0, Total=2652 [2022-11-23 16:07:22,345 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 212 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:22,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 309 Invalid, 752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:07:22,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2022-11-23 16:07:22,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 243. [2022-11-23 16:07:22,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 241 states have (on average 1.1493775933609958) internal successors, (277), 242 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:22,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 277 transitions. [2022-11-23 16:07:22,353 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 277 transitions. Word has length 33 [2022-11-23 16:07:22,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:22,353 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 277 transitions. [2022-11-23 16:07:22,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:22,354 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 277 transitions. [2022-11-23 16:07:22,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 16:07:22,355 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:22,355 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:22,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-23 16:07:22,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-23 16:07:22,561 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:22,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:22,561 INFO L85 PathProgramCache]: Analyzing trace with hash 675848208, now seen corresponding path program 7 times [2022-11-23 16:07:22,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:22,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446229188] [2022-11-23 16:07:22,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:22,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:22,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:23,024 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:23,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:23,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446229188] [2022-11-23 16:07:23,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446229188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:23,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30208720] [2022-11-23 16:07:23,024 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:07:23,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:23,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:23,026 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:23,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 16:07:23,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:23,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-23 16:07:23,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:23,361 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:23,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:23,629 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 5 treesize of output 3 [2022-11-23 16:07:23,704 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:23,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30208720] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:23,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583591504] [2022-11-23 16:07:23,706 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:07:23,706 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:23,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:23,707 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:23,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:23,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:23,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:23,767 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 7 [2022-11-23 16:07:23,813 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 14 treesize of output 10 [2022-11-23 16:07:23,850 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 14 treesize of output 10 [2022-11-23 16:07:23,891 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 7 [2022-11-23 16:07:23,959 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:07:23,960 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 90 treesize of output 89 [2022-11-23 16:07:24,015 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 14 treesize of output 10 [2022-11-23 16:07:24,045 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 14 treesize of output 10 [2022-11-23 16:07:24,149 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:07:24,150 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 177 treesize of output 181 [2022-11-23 16:07:24,300 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:07:24,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:07:25,256 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:30,171 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6134#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:30,171 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:30,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:30,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 28 [2022-11-23 16:07:30,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415556288] [2022-11-23 16:07:30,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:30,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-23 16:07:30,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:30,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-23 16:07:30,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1604, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 16:07:30,174 INFO L87 Difference]: Start difference. First operand 243 states and 277 transitions. Second operand has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:31,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:31,055 INFO L93 Difference]: Finished difference Result 334 states and 371 transitions. [2022-11-23 16:07:31,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 16:07:31,055 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 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 [2022-11-23 16:07:31,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:31,056 INFO L225 Difference]: With dead ends: 334 [2022-11-23 16:07:31,057 INFO L226 Difference]: Without dead ends: 334 [2022-11-23 16:07:31,057 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=409, Invalid=2453, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 16:07:31,058 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 353 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 1103 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:31,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [353 Valid, 261 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1103 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 16:07:31,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2022-11-23 16:07:31,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 259. [2022-11-23 16:07:31,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 257 states have (on average 1.1517509727626458) internal successors, (296), 258 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:31,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 296 transitions. [2022-11-23 16:07:31,066 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 296 transitions. Word has length 35 [2022-11-23 16:07:31,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:31,067 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 296 transitions. [2022-11-23 16:07:31,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:31,067 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 296 transitions. [2022-11-23 16:07:31,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 16:07:31,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:31,068 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:31,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:31,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:31,274 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:31,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:31,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1772114409, now seen corresponding path program 8 times [2022-11-23 16:07:31,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:31,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799209469] [2022-11-23 16:07:31,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:31,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:31,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:31,848 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:31,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:31,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799209469] [2022-11-23 16:07:31,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799209469] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:31,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191923704] [2022-11-23 16:07:31,849 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:07:31,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:31,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:31,850 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:31,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 16:07:32,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 16:07:32,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:07:32,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-23 16:07:32,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:32,249 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 14 treesize of output 10 [2022-11-23 16:07:32,405 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:32,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:32,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:07:32,485 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 16 treesize of output 12 [2022-11-23 16:07:32,600 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:32,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191923704] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:32,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2007413004] [2022-11-23 16:07:32,602 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:07:32,603 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:32,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:32,603 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:32,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:32,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:32,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:32,672 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 7 [2022-11-23 16:07:32,722 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 14 treesize of output 10 [2022-11-23 16:07:32,752 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 14 treesize of output 10 [2022-11-23 16:07:32,798 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 14 treesize of output 10 [2022-11-23 16:07:32,847 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 91 treesize of output 83 [2022-11-23 16:07:32,903 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 14 treesize of output 10 [2022-11-23 16:07:32,934 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 14 treesize of output 10 [2022-11-23 16:07:32,978 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 14 treesize of output 10 [2022-11-23 16:07:33,050 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:07:33,050 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 25 treesize of output 24 [2022-11-23 16:07:33,259 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:36,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7021#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:36,216 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:36,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:36,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2022-11-23 16:07:36,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715269301] [2022-11-23 16:07:36,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:36,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 16:07:36,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:36,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 16:07:36,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1718, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 16:07:36,218 INFO L87 Difference]: Start difference. First operand 259 states and 296 transitions. Second operand has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:37,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:37,143 INFO L93 Difference]: Finished difference Result 400 states and 444 transitions. [2022-11-23 16:07:37,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 16:07:37,147 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 states have internal predecessors, (72), 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 39 [2022-11-23 16:07:37,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:37,152 INFO L225 Difference]: With dead ends: 400 [2022-11-23 16:07:37,152 INFO L226 Difference]: Without dead ends: 371 [2022-11-23 16:07:37,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 814 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=338, Invalid=2854, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 16:07:37,153 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 359 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 1056 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:37,155 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 469 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1056 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-23 16:07:37,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-23 16:07:37,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 329. [2022-11-23 16:07:37,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 327 states have (on average 1.1529051987767585) internal successors, (377), 328 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:37,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 377 transitions. [2022-11-23 16:07:37,170 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 377 transitions. Word has length 39 [2022-11-23 16:07:37,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:37,170 INFO L495 AbstractCegarLoop]: Abstraction has 329 states and 377 transitions. [2022-11-23 16:07:37,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:37,170 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 377 transitions. [2022-11-23 16:07:37,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 16:07:37,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:37,171 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:37,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:37,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-23 16:07:37,372 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:37,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:37,373 INFO L85 PathProgramCache]: Analyzing trace with hash 155482516, now seen corresponding path program 4 times [2022-11-23 16:07:37,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:37,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80177640] [2022-11-23 16:07:37,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:37,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:37,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:39,182 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:07:39,182 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:39,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80177640] [2022-11-23 16:07:39,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80177640] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:39,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070559177] [2022-11-23 16:07:39,182 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:07:39,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:39,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:39,183 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:39,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 16:07:39,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:39,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-23 16:07:39,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:39,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-23 16:07:39,595 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:07:39,595 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 25 treesize of output 24 [2022-11-23 16:07:39,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-23 16:07:39,888 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:39,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:40,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 46 [2022-11-23 16:07:40,717 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:40,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070559177] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:40,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973507119] [2022-11-23 16:07:40,719 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:07:40,719 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:40,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:40,720 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:40,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:40,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:40,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:40,791 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 14 treesize of output 10 [2022-11-23 16:07:40,828 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 14 treesize of output 10 [2022-11-23 16:07:40,850 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 14 treesize of output 10 [2022-11-23 16:07:40,894 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 7 [2022-11-23 16:07:40,925 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 14 treesize of output 10 [2022-11-23 16:07:40,947 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 14 treesize of output 10 [2022-11-23 16:07:40,991 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 14 treesize of output 10 [2022-11-23 16:07:41,037 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:07:41,037 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 25 treesize of output 24 [2022-11-23 16:07:41,377 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:46,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8058#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:46,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:46,398 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:46,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 12, 12] total 39 [2022-11-23 16:07:46,398 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207156657] [2022-11-23 16:07:46,398 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:46,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 16:07:46,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:46,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 16:07:46,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2787, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 16:07:46,400 INFO L87 Difference]: Start difference. First operand 329 states and 377 transitions. Second operand has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:51,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:07:51,306 INFO L93 Difference]: Finished difference Result 554 states and 620 transitions. [2022-11-23 16:07:51,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 16:07:51,307 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 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 39 [2022-11-23 16:07:51,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:07:51,309 INFO L225 Difference]: With dead ends: 554 [2022-11-23 16:07:51,309 INFO L226 Difference]: Without dead ends: 398 [2022-11-23 16:07:51,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=687, Invalid=6285, Unknown=0, NotChecked=0, Total=6972 [2022-11-23 16:07:51,312 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 486 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 1128 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 1144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:07:51,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 231 Invalid, 1144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1128 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 16:07:51,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2022-11-23 16:07:51,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 370. [2022-11-23 16:07:51,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 368 states have (on average 1.1576086956521738) internal successors, (426), 369 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:51,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 426 transitions. [2022-11-23 16:07:51,335 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 426 transitions. Word has length 39 [2022-11-23 16:07:51,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:07:51,335 INFO L495 AbstractCegarLoop]: Abstraction has 370 states and 426 transitions. [2022-11-23 16:07:51,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:07:51,336 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 426 transitions. [2022-11-23 16:07:51,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-23 16:07:51,337 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:07:51,337 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:07:51,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 16:07:51,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-23 16:07:51,548 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:07:51,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:07:51,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1721940955, now seen corresponding path program 9 times [2022-11-23 16:07:51,549 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:07:51,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938062960] [2022-11-23 16:07:51,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:07:51,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:07:51,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:07:52,167 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 9 proven. 61 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:52,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:07:52,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938062960] [2022-11-23 16:07:52,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1938062960] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:07:52,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583958172] [2022-11-23 16:07:52,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:07:52,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:07:52,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:07:52,169 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:07:52,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 16:07:52,321 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:07:52,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:07:52,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-23 16:07:52,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:07:52,340 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:07:52,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:07:52,574 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:52,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:07:53,087 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:07:53,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583958172] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:07:53,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986514708] [2022-11-23 16:07:53,089 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:07:53,090 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:07:53,090 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:07:53,090 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:07:53,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:07:53,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:07:53,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:07:53,171 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 7 [2022-11-23 16:07:53,222 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 14 treesize of output 10 [2022-11-23 16:07:53,265 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 14 treesize of output 10 [2022-11-23 16:07:53,308 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 7 [2022-11-23 16:07:53,370 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:07:53,370 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 90 treesize of output 89 [2022-11-23 16:07:53,429 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 14 treesize of output 10 [2022-11-23 16:07:53,456 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 14 treesize of output 10 [2022-11-23 16:07:53,560 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:07:53,560 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 177 treesize of output 181 [2022-11-23 16:07:53,730 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:07:53,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:07:54,727 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:07:59,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9334#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:07:59,611 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:07:59,612 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:07:59,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 38 [2022-11-23 16:07:59,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764150858] [2022-11-23 16:07:59,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:07:59,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-23 16:07:59,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:07:59,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-23 16:07:59,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2474, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 16:07:59,615 INFO L87 Difference]: Start difference. First operand 370 states and 426 transitions. Second operand has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:00,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:00,843 INFO L93 Difference]: Finished difference Result 507 states and 567 transitions. [2022-11-23 16:08:00,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-23 16:08:00,847 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 states have internal predecessors, (103), 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 [2022-11-23 16:08:00,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:00,850 INFO L225 Difference]: With dead ends: 507 [2022-11-23 16:08:00,850 INFO L226 Difference]: Without dead ends: 507 [2022-11-23 16:08:00,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1261 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=626, Invalid=3664, Unknown=0, NotChecked=0, Total=4290 [2022-11-23 16:08:00,854 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 532 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 1246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:00,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 256 Invalid, 1246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 16:08:00,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2022-11-23 16:08:00,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 390. [2022-11-23 16:08:00,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 388 states have (on average 1.1597938144329898) internal successors, (450), 389 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:00,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 450 transitions. [2022-11-23 16:08:00,867 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 450 transitions. Word has length 41 [2022-11-23 16:08:00,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:00,867 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 450 transitions. [2022-11-23 16:08:00,867 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:00,867 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 450 transitions. [2022-11-23 16:08:00,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-23 16:08:00,868 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:00,869 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:08:00,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:01,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:01,080 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:08:01,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:01,081 INFO L85 PathProgramCache]: Analyzing trace with hash -2031375522, now seen corresponding path program 5 times [2022-11-23 16:08:01,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:01,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160524777] [2022-11-23 16:08:01,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:01,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:01,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:01,439 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:01,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:01,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160524777] [2022-11-23 16:08:01,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160524777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:01,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587742352] [2022-11-23 16:08:01,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:08:01,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:01,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:01,442 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:01,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 16:08:01,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-23 16:08:01,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:08:01,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 16:08:01,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:01,884 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:01,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:08:02,120 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 7 treesize of output 5 [2022-11-23 16:08:02,185 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:02,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587742352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:08:02,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335729889] [2022-11-23 16:08:02,188 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:08:02,188 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:08:02,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:08:02,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:08:02,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:08:02,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:02,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:08:02,272 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 14 treesize of output 10 [2022-11-23 16:08:02,332 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 14 treesize of output 10 [2022-11-23 16:08:02,361 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 14 treesize of output 10 [2022-11-23 16:08:02,424 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 14 treesize of output 10 [2022-11-23 16:08:02,476 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 14 treesize of output 10 [2022-11-23 16:08:02,518 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 14 treesize of output 10 [2022-11-23 16:08:02,544 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 14 treesize of output 10 [2022-11-23 16:08:02,584 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 14 treesize of output 10 [2022-11-23 16:08:02,636 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:08:02,636 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 25 treesize of output 24 [2022-11-23 16:08:02,947 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:08:06,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10538#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:08:06,525 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:08:06,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:08:06,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2022-11-23 16:08:06,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611527084] [2022-11-23 16:08:06,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:08:06,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 16:08:06,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:08:06,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 16:08:06,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1514, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 16:08:06,528 INFO L87 Difference]: Start difference. First operand 390 states and 450 transitions. Second operand has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:07,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:07,072 INFO L93 Difference]: Finished difference Result 599 states and 680 transitions. [2022-11-23 16:08:07,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 16:08:07,073 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 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 [2022-11-23 16:08:07,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:07,075 INFO L225 Difference]: With dead ends: 599 [2022-11-23 16:08:07,076 INFO L226 Difference]: Without dead ends: 599 [2022-11-23 16:08:07,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=359, Invalid=2191, Unknown=0, NotChecked=0, Total=2550 [2022-11-23 16:08:07,077 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 310 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:07,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 194 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 16:08:07,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2022-11-23 16:08:07,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 480. [2022-11-23 16:08:07,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 478 states have (on average 1.1569037656903767) internal successors, (553), 479 states have internal predecessors, (553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:07,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 553 transitions. [2022-11-23 16:08:07,091 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 553 transitions. Word has length 41 [2022-11-23 16:08:07,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:07,091 INFO L495 AbstractCegarLoop]: Abstraction has 480 states and 553 transitions. [2022-11-23 16:08:07,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:07,092 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 553 transitions. [2022-11-23 16:08:07,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-23 16:08:07,093 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:07,093 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:08:07,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:07,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:07,300 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:08:07,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:07,300 INFO L85 PathProgramCache]: Analyzing trace with hash 1705656236, now seen corresponding path program 10 times [2022-11-23 16:08:07,300 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:07,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756997677] [2022-11-23 16:08:07,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:07,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:07,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:08,029 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:08,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:08,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756997677] [2022-11-23 16:08:08,029 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756997677] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:08,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305532161] [2022-11-23 16:08:08,030 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:08:08,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:08,030 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:08,031 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:08,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 16:08:08,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:08,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-23 16:08:08,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:08,418 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 14 treesize of output 10 [2022-11-23 16:08:08,610 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:08,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:08:08,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:08:08,703 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 16 treesize of output 12 [2022-11-23 16:08:08,853 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:08,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305532161] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:08:08,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1169811985] [2022-11-23 16:08:08,855 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:08:08,855 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:08:08,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:08:08,856 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:08:08,856 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:08:08,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:08,891 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:08:08,927 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 14 treesize of output 10 [2022-11-23 16:08:08,967 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 14 treesize of output 10 [2022-11-23 16:08:08,990 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 14 treesize of output 10 [2022-11-23 16:08:09,055 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 7 [2022-11-23 16:08:09,096 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 14 treesize of output 10 [2022-11-23 16:08:09,123 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 14 treesize of output 10 [2022-11-23 16:08:09,183 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 14 treesize of output 10 [2022-11-23 16:08:09,237 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:08:09,238 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 25 treesize of output 24 [2022-11-23 16:08:09,414 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:08:12,689 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11947#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:08:12,689 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:08:12,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:08:12,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2022-11-23 16:08:12,690 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846429163] [2022-11-23 16:08:12,690 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:08:12,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-23 16:08:12,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:08:12,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-23 16:08:12,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1980, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 16:08:12,691 INFO L87 Difference]: Start difference. First operand 480 states and 553 transitions. Second operand has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:14,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:14,201 INFO L93 Difference]: Finished difference Result 743 states and 834 transitions. [2022-11-23 16:08:14,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 16:08:14,202 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 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 45 [2022-11-23 16:08:14,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:14,204 INFO L225 Difference]: With dead ends: 743 [2022-11-23 16:08:14,204 INFO L226 Difference]: Without dead ends: 661 [2022-11-23 16:08:14,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=369, Invalid=3413, Unknown=0, NotChecked=0, Total=3782 [2022-11-23 16:08:14,205 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 382 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 1624 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 733 SdHoareTripleChecker+Invalid, 1631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:14,206 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [382 Valid, 733 Invalid, 1631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1624 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 16:08:14,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2022-11-23 16:08:14,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 589. [2022-11-23 16:08:14,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 587 states have (on average 1.1584327086882453) internal successors, (680), 588 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:14,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 680 transitions. [2022-11-23 16:08:14,220 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 680 transitions. Word has length 45 [2022-11-23 16:08:14,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:14,220 INFO L495 AbstractCegarLoop]: Abstraction has 589 states and 680 transitions. [2022-11-23 16:08:14,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:14,221 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 680 transitions. [2022-11-23 16:08:14,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 16:08:14,222 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:14,222 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:08:14,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:14,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-23 16:08:14,435 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:08:14,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:14,436 INFO L85 PathProgramCache]: Analyzing trace with hash 1110872890, now seen corresponding path program 11 times [2022-11-23 16:08:14,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:14,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451295003] [2022-11-23 16:08:14,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:14,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:14,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:15,100 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 16 proven. 86 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:15,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:15,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451295003] [2022-11-23 16:08:15,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451295003] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:15,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206038371] [2022-11-23 16:08:15,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:08:15,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:15,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:15,103 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:15,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 16:08:15,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 16:08:15,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:08:15,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 16:08:15,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:15,827 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:15,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:08:16,176 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 7 treesize of output 5 [2022-11-23 16:08:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:16,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206038371] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:08:16,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1192300675] [2022-11-23 16:08:16,287 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:08:16,288 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:08:16,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:08:16,288 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:08:16,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:08:16,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:16,318 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:08:16,360 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 7 [2022-11-23 16:08:16,396 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 14 treesize of output 10 [2022-11-23 16:08:16,422 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 14 treesize of output 10 [2022-11-23 16:08:16,474 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 7 [2022-11-23 16:08:16,522 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:08:16,523 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 90 treesize of output 89 [2022-11-23 16:08:16,568 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 14 treesize of output 10 [2022-11-23 16:08:16,591 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 14 treesize of output 10 [2022-11-23 16:08:16,687 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:08:16,687 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 177 treesize of output 181 [2022-11-23 16:08:16,843 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:08:16,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:08:17,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:08:23,434 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13642#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:08:23,435 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:08:23,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:08:23,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 42 [2022-11-23 16:08:23,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022581998] [2022-11-23 16:08:23,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:08:23,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-23 16:08:23,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:08:23,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-23 16:08:23,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=2836, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 16:08:23,437 INFO L87 Difference]: Start difference. First operand 589 states and 680 transitions. Second operand has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:24,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:24,649 INFO L93 Difference]: Finished difference Result 778 states and 874 transitions. [2022-11-23 16:08:24,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 16:08:24,650 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 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 47 [2022-11-23 16:08:24,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:24,653 INFO L225 Difference]: With dead ends: 778 [2022-11-23 16:08:24,654 INFO L226 Difference]: Without dead ends: 778 [2022-11-23 16:08:24,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1763 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=747, Invalid=4365, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:08:24,655 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 583 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 1288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:24,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 319 Invalid, 1288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1266 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 16:08:24,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2022-11-23 16:08:24,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 613. [2022-11-23 16:08:24,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 613 states, 611 states have (on average 1.160392798690671) internal successors, (709), 612 states have internal predecessors, (709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:24,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 709 transitions. [2022-11-23 16:08:24,673 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 709 transitions. Word has length 47 [2022-11-23 16:08:24,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:24,674 INFO L495 AbstractCegarLoop]: Abstraction has 613 states and 709 transitions. [2022-11-23 16:08:24,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:24,674 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 709 transitions. [2022-11-23 16:08:24,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-23 16:08:24,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:24,676 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:08:24,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:24,882 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-23 16:08:24,882 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:08:24,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:24,883 INFO L85 PathProgramCache]: Analyzing trace with hash -928527393, now seen corresponding path program 6 times [2022-11-23 16:08:24,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:24,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438802319] [2022-11-23 16:08:24,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:24,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:24,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:25,753 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:25,753 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:25,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438802319] [2022-11-23 16:08:25,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438802319] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:25,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162544981] [2022-11-23 16:08:25,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:08:25,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:25,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:25,761 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:25,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 16:08:25,930 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:08:25,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:08:25,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-23 16:08:25,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:26,155 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 14 treesize of output 10 [2022-11-23 16:08:26,231 INFO L321 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-11-23 16:08:26,232 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 24 treesize of output 23 [2022-11-23 16:08:28,361 INFO L321 Elim1Store]: treesize reduction 102, result has 27.7 percent of original size [2022-11-23 16:08:28,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 70 treesize of output 61 [2022-11-23 16:08:28,425 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:28,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:08:29,566 INFO L321 Elim1Store]: treesize reduction 55, result has 42.1 percent of original size [2022-11-23 16:08:29,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 512 treesize of output 399 [2022-11-23 16:08:29,595 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:08:29,595 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 357 treesize of output 331 [2022-11-23 16:08:29,639 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 370 treesize of output 346 [2022-11-23 16:08:29,841 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:29,910 INFO L321 Elim1Store]: treesize reduction 10, result has 82.5 percent of original size [2022-11-23 16:08:29,911 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 143 treesize of output 142 [2022-11-23 16:08:30,825 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:30,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162544981] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:08:30,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1209080021] [2022-11-23 16:08:30,827 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:08:30,827 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:08:30,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:08:30,828 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:08:30,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:08:30,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:30,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:08:30,897 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 7 [2022-11-23 16:08:30,956 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 14 treesize of output 10 [2022-11-23 16:08:31,000 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 14 treesize of output 10 [2022-11-23 16:08:31,053 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 7 [2022-11-23 16:08:31,113 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:08:31,114 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 90 treesize of output 89 [2022-11-23 16:08:31,171 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 14 treesize of output 10 [2022-11-23 16:08:31,199 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 14 treesize of output 10 [2022-11-23 16:08:31,311 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:08:31,312 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 177 treesize of output 181 [2022-11-23 16:08:31,492 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:08:31,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:08:33,056 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:08:38,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15430#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:08:38,551 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:08:38,551 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:08:38,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 23, 23] total 58 [2022-11-23 16:08:38,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440652788] [2022-11-23 16:08:38,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:08:38,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-23 16:08:38,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:08:38,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-23 16:08:38,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=5065, Unknown=0, NotChecked=0, Total=5402 [2022-11-23 16:08:38,553 INFO L87 Difference]: Start difference. First operand 613 states and 709 transitions. Second operand has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:45,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:45,668 INFO L93 Difference]: Finished difference Result 1765 states and 2014 transitions. [2022-11-23 16:08:45,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-23 16:08:45,668 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 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 50 [2022-11-23 16:08:45,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:45,675 INFO L225 Difference]: With dead ends: 1765 [2022-11-23 16:08:45,675 INFO L226 Difference]: Without dead ends: 1707 [2022-11-23 16:08:45,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2834 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1146, Invalid=11064, Unknown=0, NotChecked=0, Total=12210 [2022-11-23 16:08:45,677 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 966 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 2161 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 966 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 2202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 2161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:45,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [966 Valid, 747 Invalid, 2202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 2161 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-23 16:08:45,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1707 states. [2022-11-23 16:08:45,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1707 to 1048. [2022-11-23 16:08:45,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1048 states, 1046 states have (on average 1.155831739961759) internal successors, (1209), 1047 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:45,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1048 states to 1048 states and 1209 transitions. [2022-11-23 16:08:45,709 INFO L78 Accepts]: Start accepts. Automaton has 1048 states and 1209 transitions. Word has length 50 [2022-11-23 16:08:45,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:45,709 INFO L495 AbstractCegarLoop]: Abstraction has 1048 states and 1209 transitions. [2022-11-23 16:08:45,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:08:45,710 INFO L276 IsEmpty]: Start isEmpty. Operand 1048 states and 1209 transitions. [2022-11-23 16:08:45,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 16:08:45,712 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:45,712 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:08:45,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:45,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-23 16:08:45,920 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:08:45,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:45,920 INFO L85 PathProgramCache]: Analyzing trace with hash 1416363073, now seen corresponding path program 12 times [2022-11-23 16:08:45,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:45,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996129924] [2022-11-23 16:08:45,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:45,921 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:45,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:46,694 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:08:46,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:46,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996129924] [2022-11-23 16:08:46,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996129924] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:46,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315353356] [2022-11-23 16:08:46,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:08:46,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:46,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:46,696 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:46,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 16:08:46,881 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:08:46,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:08:46,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-23 16:08:46,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:47,120 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 14 treesize of output 10 [2022-11-23 16:09:22,825 INFO L321 Elim1Store]: treesize reduction 25, result has 49.0 percent of original size [2022-11-23 16:09:22,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 82 treesize of output 60 [2022-11-23 16:09:22,832 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 33 proven. 50 refuted. 44 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:09:22,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:09:36,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 79 [2022-11-23 16:09:36,768 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:36,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 91 treesize of output 67 [2022-11-23 16:09:37,393 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 79 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:09:37,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315353356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:09:37,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1920723664] [2022-11-23 16:09:37,395 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:09:37,395 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:09:37,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:09:37,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:09:37,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:09:37,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:37,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:09:37,474 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 7 [2022-11-23 16:09:37,527 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 14 treesize of output 10 [2022-11-23 16:09:37,563 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 14 treesize of output 10 [2022-11-23 16:09:37,606 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 14 treesize of output 10 [2022-11-23 16:09:37,653 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 91 treesize of output 83 [2022-11-23 16:09:37,703 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 14 treesize of output 10 [2022-11-23 16:09:37,740 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 14 treesize of output 10 [2022-11-23 16:09:37,783 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 14 treesize of output 10 [2022-11-23 16:09:37,831 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:09:37,831 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 25 treesize of output 24 [2022-11-23 16:09:37,996 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:09:42,637 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18703#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:09:42,637 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:09:42,638 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:09:42,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 30, 30] total 71 [2022-11-23 16:09:42,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734923094] [2022-11-23 16:09:42,638 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:09:42,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-11-23 16:09:42,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:42,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-11-23 16:09:42,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=6496, Unknown=67, NotChecked=0, Total=7140 [2022-11-23 16:09:42,640 INFO L87 Difference]: Start difference. First operand 1048 states and 1209 transitions. Second operand has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:11:29,609 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:11:31,636 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:12:09,780 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.16s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:12:59,330 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:13:32,709 WARN L233 SmtUtils]: Spent 5.14s on a formula simplification. DAG size of input: 65 DAG size of output: 60 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:13:53,762 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:13:55,772 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:13:55,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:13:55,773 INFO L93 Difference]: Finished difference Result 1790 states and 1990 transitions. [2022-11-23 16:13:55,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-23 16:13:55,773 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 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 51 [2022-11-23 16:13:55,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:13:55,777 INFO L225 Difference]: With dead ends: 1790 [2022-11-23 16:13:55,777 INFO L226 Difference]: Without dead ends: 1690 [2022-11-23 16:13:55,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8004 ImplicationChecksByTransitivity, 214.0s TimeCoverageRelationStatistics Valid=3221, Invalid=26698, Unknown=183, NotChecked=0, Total=30102 [2022-11-23 16:13:55,780 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 1645 mSDsluCounter, 936 mSDsCounter, 0 mSdLazyCounter, 4190 mSolverCounterSat, 66 mSolverCounterUnsat, 142 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 93.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1645 SdHoareTripleChecker+Valid, 992 SdHoareTripleChecker+Invalid, 4398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 4190 IncrementalHoareTripleChecker+Invalid, 142 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 93.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:13:55,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1645 Valid, 992 Invalid, 4398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 4190 Invalid, 142 Unknown, 0 Unchecked, 93.4s Time] [2022-11-23 16:13:55,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2022-11-23 16:13:55,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1280. [2022-11-23 16:13:55,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1278 states have (on average 1.158059467918623) internal successors, (1480), 1279 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:13:55,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 1480 transitions. [2022-11-23 16:13:55,805 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 1480 transitions. Word has length 51 [2022-11-23 16:13:55,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:13:55,805 INFO L495 AbstractCegarLoop]: Abstraction has 1280 states and 1480 transitions. [2022-11-23 16:13:55,806 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:13:55,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 1480 transitions. [2022-11-23 16:13:55,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-23 16:13:55,808 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:13:55,808 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:13:55,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 16:13:56,015 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:56,015 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:13:56,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:13:56,016 INFO L85 PathProgramCache]: Analyzing trace with hash 527726549, now seen corresponding path program 7 times [2022-11-23 16:13:56,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:13:56,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591370575] [2022-11-23 16:13:56,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:56,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:13:56,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:56,463 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 70 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:13:56,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:13:56,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591370575] [2022-11-23 16:13:56,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591370575] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:13:56,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160763396] [2022-11-23 16:13:56,464 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:13:56,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:56,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:13:56,475 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:13:56,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 16:13:56,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:56,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-23 16:13:56,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:13:56,919 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:13:56,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:13:57,206 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 5 treesize of output 3 [2022-11-23 16:13:57,278 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:13:57,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160763396] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:13:57,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268260204] [2022-11-23 16:13:57,280 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:13:57,280 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:13:57,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:13:57,281 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:13:57,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:13:57,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:57,317 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:13:57,348 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 7 [2022-11-23 16:13:57,394 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 14 treesize of output 10 [2022-11-23 16:13:57,424 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 14 treesize of output 10 [2022-11-23 16:13:57,464 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 7 [2022-11-23 16:13:57,514 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:13:57,514 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 90 treesize of output 89 [2022-11-23 16:13:57,564 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 14 treesize of output 10 [2022-11-23 16:13:57,584 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 14 treesize of output 10 [2022-11-23 16:13:57,694 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:13:57,694 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 177 treesize of output 181 [2022-11-23 16:13:57,849 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:13:57,850 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:13:59,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:03,295 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22299#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:03,295 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:03,295 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:14:03,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 26 [2022-11-23 16:14:03,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087567373] [2022-11-23 16:14:03,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:03,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-23 16:14:03,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:03,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-23 16:14:03,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1613, Unknown=0, NotChecked=0, Total=1806 [2022-11-23 16:14:03,297 INFO L87 Difference]: Start difference. First operand 1280 states and 1480 transitions. Second operand has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:03,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:03,940 INFO L93 Difference]: Finished difference Result 1991 states and 2298 transitions. [2022-11-23 16:14:03,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-23 16:14:03,940 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 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 52 [2022-11-23 16:14:03,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:03,946 INFO L225 Difference]: With dead ends: 1991 [2022-11-23 16:14:03,946 INFO L226 Difference]: Without dead ends: 1991 [2022-11-23 16:14:03,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 119 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=389, Invalid=2473, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 16:14:03,947 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 511 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 511 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:03,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [511 Valid, 260 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 16:14:03,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1991 states. [2022-11-23 16:14:03,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1991 to 1428. [2022-11-23 16:14:03,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1428 states, 1426 states have (on average 1.1577840112201963) internal successors, (1651), 1427 states have internal predecessors, (1651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:03,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1428 states to 1428 states and 1651 transitions. [2022-11-23 16:14:03,978 INFO L78 Accepts]: Start accepts. Automaton has 1428 states and 1651 transitions. Word has length 52 [2022-11-23 16:14:03,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:03,978 INFO L495 AbstractCegarLoop]: Abstraction has 1428 states and 1651 transitions. [2022-11-23 16:14:03,979 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:03,979 INFO L276 IsEmpty]: Start isEmpty. Operand 1428 states and 1651 transitions. [2022-11-23 16:14:03,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-23 16:14:03,981 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:03,981 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:14:03,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 16:14:04,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:04,188 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:14:04,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:14:04,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1797067441, now seen corresponding path program 13 times [2022-11-23 16:14:04,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:14:04,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713964223] [2022-11-23 16:14:04,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:04,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:14:04,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:04,876 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 25 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:04,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:14:04,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713964223] [2022-11-23 16:14:04,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713964223] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:14:04,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807344436] [2022-11-23 16:14:04,877 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:14:04,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:04,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:14:04,878 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:14:04,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 16:14:05,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:05,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-23 16:14:05,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:14:05,347 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:05,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:14:05,716 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 5 treesize of output 3 [2022-11-23 16:14:05,855 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:05,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807344436] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:14:05,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [402563291] [2022-11-23 16:14:05,857 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:14:05,857 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:14:05,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:14:05,858 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:14:05,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:14:05,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:14:05,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:14:05,915 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 11 treesize of output 7 [2022-11-23 16:14:05,951 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 14 treesize of output 10 [2022-11-23 16:14:05,988 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 14 treesize of output 10 [2022-11-23 16:14:06,029 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 11 treesize of output 7 [2022-11-23 16:14:06,091 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:14:06,091 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 90 treesize of output 89 [2022-11-23 16:14:06,147 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 14 treesize of output 10 [2022-11-23 16:14:06,171 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 14 treesize of output 10 [2022-11-23 16:14:06,250 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:14:06,251 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 177 treesize of output 181 [2022-11-23 16:14:06,396 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:14:06,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:14:07,448 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:12,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26108#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:12,925 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:12,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:14:12,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 40 [2022-11-23 16:14:12,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695868702] [2022-11-23 16:14:12,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:12,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-23 16:14:12,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:12,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-23 16:14:12,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=2672, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 16:14:12,927 INFO L87 Difference]: Start difference. First operand 1428 states and 1651 transitions. Second operand has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:14,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:14,673 INFO L93 Difference]: Finished difference Result 1790 states and 2025 transitions. [2022-11-23 16:14:14,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-23 16:14:14,674 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 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 53 [2022-11-23 16:14:14,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:14,677 INFO L225 Difference]: With dead ends: 1790 [2022-11-23 16:14:14,677 INFO L226 Difference]: Without dead ends: 1790 [2022-11-23 16:14:14,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 114 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=742, Invalid=4370, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:14:14,677 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 509 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 2482 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 509 SdHoareTripleChecker+Valid, 516 SdHoareTripleChecker+Invalid, 2488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 2482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:14,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [509 Valid, 516 Invalid, 2488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 2482 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-23 16:14:14,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1790 states. [2022-11-23 16:14:14,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1790 to 1468. [2022-11-23 16:14:14,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1468 states, 1466 states have (on average 1.159618008185539) internal successors, (1700), 1467 states have internal predecessors, (1700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:14,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1468 states to 1468 states and 1700 transitions. [2022-11-23 16:14:14,703 INFO L78 Accepts]: Start accepts. Automaton has 1468 states and 1700 transitions. Word has length 53 [2022-11-23 16:14:14,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:14,704 INFO L495 AbstractCegarLoop]: Abstraction has 1468 states and 1700 transitions. [2022-11-23 16:14:14,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:14,704 INFO L276 IsEmpty]: Start isEmpty. Operand 1468 states and 1700 transitions. [2022-11-23 16:14:14,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 16:14:14,706 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:14,706 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:14:14,717 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-23 16:14:14,912 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-23 16:14:14,912 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:14:14,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:14:14,913 INFO L85 PathProgramCache]: Analyzing trace with hash -2063977640, now seen corresponding path program 1 times [2022-11-23 16:14:14,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:14:14,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915287018] [2022-11-23 16:14:14,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:14,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:14:14,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:16,488 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 16:14:16,488 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:14:16,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915287018] [2022-11-23 16:14:16,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915287018] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:14:16,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306340281] [2022-11-23 16:14:16,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:16,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:16,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:14:16,490 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:14:16,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 16:14:16,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:16,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 95 conjunts are in the unsatisfiable core [2022-11-23 16:14:16,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:14:17,000 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 14 treesize of output 10 [2022-11-23 16:14:17,082 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:14:17,082 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 16 treesize of output 22 [2022-11-23 16:14:17,089 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 7 treesize of output 3 [2022-11-23 16:14:18,866 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 73 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 16:14:18,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:14:22,274 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:14:22,275 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 161 treesize of output 106 [2022-11-23 16:14:22,296 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:14:22,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 210 treesize of output 183 [2022-11-23 16:14:22,330 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:14:22,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 155 treesize of output 145 [2022-11-23 16:14:22,769 INFO L321 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2022-11-23 16:14:22,769 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 141 treesize of output 1 [2022-11-23 16:14:23,423 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 6 proven. 77 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 16:14:23,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306340281] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:14:23,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323967115] [2022-11-23 16:14:23,425 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:14:23,425 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:14:23,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:14:23,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:14:23,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:14:23,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:14:23,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:14:23,494 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 7 [2022-11-23 16:14:23,554 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 14 treesize of output 10 [2022-11-23 16:14:23,598 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 14 treesize of output 10 [2022-11-23 16:14:23,640 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 7 [2022-11-23 16:14:23,699 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:14:23,700 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 90 treesize of output 89 [2022-11-23 16:14:23,756 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 14 treesize of output 10 [2022-11-23 16:14:23,782 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 14 treesize of output 10 [2022-11-23 16:14:23,894 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:14:23,894 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 177 treesize of output 181 [2022-11-23 16:14:24,074 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:14:24,074 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:14:25,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:29,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29804#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:29,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:29,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:14:29,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 23] total 59 [2022-11-23 16:14:29,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254330029] [2022-11-23 16:14:29,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:29,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-23 16:14:29,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:29,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-23 16:14:29,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=5306, Unknown=1, NotChecked=0, Total=5550 [2022-11-23 16:14:29,947 INFO L87 Difference]: Start difference. First operand 1468 states and 1700 transitions. Second operand has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:42,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:42,963 INFO L93 Difference]: Finished difference Result 1904 states and 2179 transitions. [2022-11-23 16:14:42,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-11-23 16:14:42,964 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 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 56 [2022-11-23 16:14:42,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:42,967 INFO L225 Difference]: With dead ends: 1904 [2022-11-23 16:14:42,967 INFO L226 Difference]: Without dead ends: 1202 [2022-11-23 16:14:42,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3199 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=1259, Invalid=14742, Unknown=1, NotChecked=0, Total=16002 [2022-11-23 16:14:42,968 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1009 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 2226 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1009 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 2254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 2226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:42,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1009 Valid, 423 Invalid, 2254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 2226 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-23 16:14:42,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1202 states. [2022-11-23 16:14:42,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1202 to 971. [2022-11-23 16:14:42,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 971 states, 969 states have (on average 1.1651186790505677) internal successors, (1129), 970 states have internal predecessors, (1129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:42,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 971 states to 971 states and 1129 transitions. [2022-11-23 16:14:42,986 INFO L78 Accepts]: Start accepts. Automaton has 971 states and 1129 transitions. Word has length 56 [2022-11-23 16:14:42,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:42,986 INFO L495 AbstractCegarLoop]: Abstraction has 971 states and 1129 transitions. [2022-11-23 16:14:42,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:42,987 INFO L276 IsEmpty]: Start isEmpty. Operand 971 states and 1129 transitions. [2022-11-23 16:14:42,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-23 16:14:42,988 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:42,989 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:14:43,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 16:14:43,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:43,194 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:14:43,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:14:43,195 INFO L85 PathProgramCache]: Analyzing trace with hash 1719878614, now seen corresponding path program 14 times [2022-11-23 16:14:43,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:14:43,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038475399] [2022-11-23 16:14:43,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:43,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:14:43,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:44,006 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:44,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:14:44,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038475399] [2022-11-23 16:14:44,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038475399] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:14:44,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494424581] [2022-11-23 16:14:44,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:14:44,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:44,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:14:44,008 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:14:44,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 16:14:44,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-23 16:14:44,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:14:44,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-23 16:14:44,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:14:44,667 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 14 treesize of output 10 [2022-11-23 16:14:44,852 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:44,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:14:44,983 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:14:44,985 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 16 treesize of output 12 [2022-11-23 16:14:45,147 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:45,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494424581] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:14:45,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1717006668] [2022-11-23 16:14:45,148 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:14:45,148 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:14:45,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:14:45,149 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:14:45,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:14:45,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:14:45,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:14:45,220 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 14 treesize of output 10 [2022-11-23 16:14:45,259 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 14 treesize of output 10 [2022-11-23 16:14:45,281 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 14 treesize of output 10 [2022-11-23 16:14:45,328 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 14 treesize of output 10 [2022-11-23 16:14:45,378 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 14 treesize of output 10 [2022-11-23 16:14:45,409 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 14 treesize of output 10 [2022-11-23 16:14:45,432 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 14 treesize of output 10 [2022-11-23 16:14:45,471 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 14 treesize of output 10 [2022-11-23 16:14:45,518 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:14:45,518 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 25 treesize of output 24 [2022-11-23 16:14:45,667 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:48,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33173#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:48,887 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:48,887 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:14:48,887 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2022-11-23 16:14:48,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346138717] [2022-11-23 16:14:48,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:48,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-23 16:14:48,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:48,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-23 16:14:48,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=2558, Unknown=0, NotChecked=0, Total=2756 [2022-11-23 16:14:48,889 INFO L87 Difference]: Start difference. First operand 971 states and 1129 transitions. Second operand has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:50,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:50,869 INFO L93 Difference]: Finished difference Result 1449 states and 1646 transitions. [2022-11-23 16:14:50,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 16:14:50,870 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 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 57 [2022-11-23 16:14:50,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:50,872 INFO L225 Difference]: With dead ends: 1449 [2022-11-23 16:14:50,872 INFO L226 Difference]: Without dead ends: 1278 [2022-11-23 16:14:50,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=431, Invalid=4681, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:14:50,873 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 518 mSDsluCounter, 1146 mSDsCounter, 0 mSdLazyCounter, 2653 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 518 SdHoareTripleChecker+Valid, 1217 SdHoareTripleChecker+Invalid, 2662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:50,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [518 Valid, 1217 Invalid, 2662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2653 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-23 16:14:50,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1278 states. [2022-11-23 16:14:50,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1278 to 1147. [2022-11-23 16:14:50,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1145 states have (on average 1.1676855895196507) internal successors, (1337), 1146 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:50,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1337 transitions. [2022-11-23 16:14:50,891 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1337 transitions. Word has length 57 [2022-11-23 16:14:50,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:50,891 INFO L495 AbstractCegarLoop]: Abstraction has 1147 states and 1337 transitions. [2022-11-23 16:14:50,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:50,892 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1337 transitions. [2022-11-23 16:14:50,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-23 16:14:50,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:50,894 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:14:50,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 16:14:51,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-23 16:14:51,100 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:14:51,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:14:51,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1730629020, now seen corresponding path program 15 times [2022-11-23 16:14:51,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:14:51,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330813893] [2022-11-23 16:14:51,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:51,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:14:51,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:51,846 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 36 proven. 148 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:51,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:14:51,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330813893] [2022-11-23 16:14:51,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330813893] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:14:51,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360054304] [2022-11-23 16:14:51,847 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:14:51,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:51,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:14:51,848 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:14:51,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 16:14:52,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:14:52,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:14:52,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-23 16:14:52,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:14:52,055 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:14:52,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:14:52,396 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:52,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:14:53,172 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:14:53,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360054304] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:14:53,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1352257156] [2022-11-23 16:14:53,173 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:14:53,173 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:14:53,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:14:53,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:14:53,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:14:53,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:14:53,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:14:53,233 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 14 treesize of output 10 [2022-11-23 16:14:53,273 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 14 treesize of output 10 [2022-11-23 16:14:53,295 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 14 treesize of output 10 [2022-11-23 16:14:53,339 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 14 treesize of output 10 [2022-11-23 16:14:53,378 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 14 treesize of output 10 [2022-11-23 16:14:53,416 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 14 treesize of output 10 [2022-11-23 16:14:53,439 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 14 treesize of output 10 [2022-11-23 16:14:53,473 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 14 treesize of output 10 [2022-11-23 16:14:53,516 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:14:53,517 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 25 treesize of output 24 [2022-11-23 16:14:53,727 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:57,747 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36223#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:57,747 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:57,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:14:57,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 53 [2022-11-23 16:14:57,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336744392] [2022-11-23 16:14:57,748 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:57,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-23 16:14:57,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:57,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-23 16:14:57,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=4080, Unknown=0, NotChecked=0, Total=4556 [2022-11-23 16:14:57,749 INFO L87 Difference]: Start difference. First operand 1147 states and 1337 transitions. Second operand has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:59,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:59,818 INFO L93 Difference]: Finished difference Result 1466 states and 1663 transitions. [2022-11-23 16:14:59,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 16:14:59,818 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 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 59 [2022-11-23 16:14:59,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:59,823 INFO L225 Difference]: With dead ends: 1466 [2022-11-23 16:14:59,823 INFO L226 Difference]: Without dead ends: 1466 [2022-11-23 16:14:59,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2131 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1162, Invalid=6320, Unknown=0, NotChecked=0, Total=7482 [2022-11-23 16:14:59,824 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 763 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 2869 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 763 SdHoareTripleChecker+Valid, 695 SdHoareTripleChecker+Invalid, 2879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 2869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:59,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [763 Valid, 695 Invalid, 2879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 2869 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-23 16:14:59,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1466 states. [2022-11-23 16:14:59,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1466 to 1179. [2022-11-23 16:14:59,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1179 states, 1177 states have (on average 1.1690739167374682) internal successors, (1376), 1178 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:59,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1179 states to 1179 states and 1376 transitions. [2022-11-23 16:14:59,847 INFO L78 Accepts]: Start accepts. Automaton has 1179 states and 1376 transitions. Word has length 59 [2022-11-23 16:14:59,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:59,848 INFO L495 AbstractCegarLoop]: Abstraction has 1179 states and 1376 transitions. [2022-11-23 16:14:59,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:14:59,848 INFO L276 IsEmpty]: Start isEmpty. Operand 1179 states and 1376 transitions. [2022-11-23 16:14:59,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-23 16:14:59,850 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:59,850 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:14:59,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-23 16:15:00,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-23 16:15:00,057 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:15:00,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:15:00,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1567102280, now seen corresponding path program 8 times [2022-11-23 16:15:00,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:15:00,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475483210] [2022-11-23 16:15:00,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:15:00,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:15:00,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:01,041 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:01,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:15:01,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475483210] [2022-11-23 16:15:01,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475483210] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:15:01,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879414490] [2022-11-23 16:15:01,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:15:01,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:01,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:15:01,043 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:15:01,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-23 16:15:01,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 16:15:01,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:15:01,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-23 16:15:01,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:15:01,284 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 [2022-11-23 16:15:01,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-23 16:15:01,815 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 17 treesize of output 19 [2022-11-23 16:15:03,392 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:03,396 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 16:15:03,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 17 [2022-11-23 16:15:03,447 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:15:03,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:04,460 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1074 (Array Int Int)) (|v_ULTIMATE.start_cstrspn_~s~0#1.offset_256| Int)) (or (not (<= |v_ULTIMATE.start_cstrspn_~s~0#1.offset_256| |c_ULTIMATE.start_main_~nondetString2~0#1.offset|)) (= (select v_ArrVal_1074 |v_ULTIMATE.start_cstrspn_~s~0#1.offset_256|) 0) (not (<= 0 |v_ULTIMATE.start_cstrspn_~s~0#1.offset_256|)) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1074) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 4 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) (select v_ArrVal_1074 |c_ULTIMATE.start_main_~nondetString2~0#1.offset|))))) is different from false [2022-11-23 16:15:04,468 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:04,468 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2022-11-23 16:15:04,475 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:04,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 39 [2022-11-23 16:15:04,493 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:04,493 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 50 [2022-11-23 16:15:05,401 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:15:05,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879414490] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:05,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1234527430] [2022-11-23 16:15:05,402 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:15:05,402 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:05,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:05,403 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:05,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:05,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:05,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:15:05,463 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 7 [2022-11-23 16:15:05,496 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 14 treesize of output 10 [2022-11-23 16:15:05,531 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 14 treesize of output 10 [2022-11-23 16:15:05,576 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 7 [2022-11-23 16:15:05,628 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:15:05,628 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 90 treesize of output 89 [2022-11-23 16:15:05,686 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 14 treesize of output 10 [2022-11-23 16:15:05,708 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 14 treesize of output 10 [2022-11-23 16:15:05,790 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:15:05,790 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 177 treesize of output 181 [2022-11-23 16:15:05,931 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:15:05,932 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:15:07,399 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:15:12,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39344#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:15:12,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:15:12,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:15:12,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 25, 24] total 63 [2022-11-23 16:15:12,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540525130] [2022-11-23 16:15:12,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:15:12,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-23 16:15:12,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:15:12,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-23 16:15:12,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=5733, Unknown=1, NotChecked=152, Total=6162 [2022-11-23 16:15:12,678 INFO L87 Difference]: Start difference. First operand 1179 states and 1376 transitions. Second operand has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:26,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:15:26,228 INFO L93 Difference]: Finished difference Result 2960 states and 3413 transitions. [2022-11-23 16:15:26,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-23 16:15:26,229 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 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 61 [2022-11-23 16:15:26,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:15:26,233 INFO L225 Difference]: With dead ends: 2960 [2022-11-23 16:15:26,233 INFO L226 Difference]: Without dead ends: 2899 [2022-11-23 16:15:26,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 132 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3943 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=1370, Invalid=16189, Unknown=1, NotChecked=262, Total=17822 [2022-11-23 16:15:26,235 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 1695 mSDsluCounter, 1018 mSDsCounter, 0 mSdLazyCounter, 3114 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1695 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 3246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 3114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-23 16:15:26,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1695 Valid, 1057 Invalid, 3246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 3114 Invalid, 0 Unknown, 96 Unchecked, 2.5s Time] [2022-11-23 16:15:26,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2899 states. [2022-11-23 16:15:26,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2899 to 1981. [2022-11-23 16:15:26,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1981 states, 1979 states have (on average 1.167256189994947) internal successors, (2310), 1980 states have internal predecessors, (2310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:26,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2310 transitions. [2022-11-23 16:15:26,269 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2310 transitions. Word has length 61 [2022-11-23 16:15:26,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:15:26,270 INFO L495 AbstractCegarLoop]: Abstraction has 1981 states and 2310 transitions. [2022-11-23 16:15:26,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:26,270 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2310 transitions. [2022-11-23 16:15:26,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-23 16:15:26,273 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:15:26,273 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:15:26,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-23 16:15:26,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:26,482 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:15:26,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:15:26,483 INFO L85 PathProgramCache]: Analyzing trace with hash 1094088299, now seen corresponding path program 16 times [2022-11-23 16:15:26,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:15:26,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503718183] [2022-11-23 16:15:26,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:15:26,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:15:26,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:27,534 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:27,534 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:15:27,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503718183] [2022-11-23 16:15:27,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503718183] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:15:27,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343086974] [2022-11-23 16:15:27,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:15:27,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:27,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:15:27,536 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:15:27,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-23 16:15:27,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:27,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-23 16:15:27,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:15:27,990 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 14 treesize of output 10 [2022-11-23 16:15:28,200 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:28,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:28,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:15:28,324 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 16 treesize of output 12 [2022-11-23 16:15:28,483 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:28,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343086974] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:28,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944463238] [2022-11-23 16:15:28,484 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:15:28,484 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:28,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:28,485 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:28,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:28,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:28,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:15:28,542 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 7 [2022-11-23 16:15:28,580 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 14 treesize of output 10 [2022-11-23 16:15:28,608 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 14 treesize of output 10 [2022-11-23 16:15:28,644 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 7 [2022-11-23 16:15:28,696 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:15:28,696 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 90 treesize of output 89 [2022-11-23 16:15:28,741 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 14 treesize of output 10 [2022-11-23 16:15:28,764 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 14 treesize of output 10 [2022-11-23 16:15:28,855 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:15:28,856 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 177 treesize of output 181 [2022-11-23 16:15:29,025 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:15:29,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:15:29,921 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:15:35,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44825#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:15:35,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:15:35,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:15:35,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2022-11-23 16:15:35,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344521678] [2022-11-23 16:15:35,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:15:35,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-23 16:15:35,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:15:35,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-23 16:15:35,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2880, Unknown=0, NotChecked=0, Total=3080 [2022-11-23 16:15:35,276 INFO L87 Difference]: Start difference. First operand 1981 states and 2310 transitions. Second operand has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:38,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:15:38,309 INFO L93 Difference]: Finished difference Result 2800 states and 3203 transitions. [2022-11-23 16:15:38,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 16:15:38,310 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 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 63 [2022-11-23 16:15:38,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:15:38,317 INFO L225 Difference]: With dead ends: 2800 [2022-11-23 16:15:38,317 INFO L226 Difference]: Without dead ends: 2601 [2022-11-23 16:15:38,317 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 154 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=456, Invalid=5396, Unknown=0, NotChecked=0, Total=5852 [2022-11-23 16:15:38,318 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 537 mSDsluCounter, 1732 mSDsCounter, 0 mSdLazyCounter, 3719 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 1814 SdHoareTripleChecker+Invalid, 3729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 3719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:15:38,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [537 Valid, 1814 Invalid, 3729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 3719 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-23 16:15:38,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2601 states. [2022-11-23 16:15:38,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2601 to 2336. [2022-11-23 16:15:38,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 2334 states have (on average 1.1700942587832048) internal successors, (2731), 2335 states have internal predecessors, (2731), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:38,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 2731 transitions. [2022-11-23 16:15:38,359 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 2731 transitions. Word has length 63 [2022-11-23 16:15:38,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:15:38,360 INFO L495 AbstractCegarLoop]: Abstraction has 2336 states and 2731 transitions. [2022-11-23 16:15:38,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:38,360 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 2731 transitions. [2022-11-23 16:15:38,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-23 16:15:38,363 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:15:38,363 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:15:38,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-23 16:15:38,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:38,570 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:15:38,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:15:38,571 INFO L85 PathProgramCache]: Analyzing trace with hash 491221906, now seen corresponding path program 9 times [2022-11-23 16:15:38,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:15:38,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622108540] [2022-11-23 16:15:38,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:15:38,571 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:15:38,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:38,986 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 9 proven. 111 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:38,986 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:15:38,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622108540] [2022-11-23 16:15:38,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622108540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:15:38,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896698202] [2022-11-23 16:15:38,986 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:15:38,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:38,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:15:38,988 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:15:39,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-23 16:15:39,231 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:15:39,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:15:39,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 16:15:39,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:15:39,625 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 16 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:39,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:39,986 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 5 treesize of output 3 [2022-11-23 16:15:40,086 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 16 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:40,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896698202] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:40,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514369285] [2022-11-23 16:15:40,087 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:15:40,087 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:40,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:40,087 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:40,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:40,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:40,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:15:40,179 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 14 treesize of output 10 [2022-11-23 16:15:40,213 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 14 treesize of output 10 [2022-11-23 16:15:40,234 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 14 treesize of output 10 [2022-11-23 16:15:40,287 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 14 treesize of output 10 [2022-11-23 16:15:40,333 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 14 treesize of output 10 [2022-11-23 16:15:40,364 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 14 treesize of output 10 [2022-11-23 16:15:40,387 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 14 treesize of output 10 [2022-11-23 16:15:40,424 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 14 treesize of output 10 [2022-11-23 16:15:40,481 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:15:40,482 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 25 treesize of output 24 [2022-11-23 16:15:40,832 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:15:44,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50421#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:15:44,448 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:15:44,448 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:15:44,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 30 [2022-11-23 16:15:44,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494765423] [2022-11-23 16:15:44,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:15:44,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 16:15:44,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:15:44,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 16:15:44,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1932, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 16:15:44,450 INFO L87 Difference]: Start difference. First operand 2336 states and 2731 transitions. Second operand has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:45,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:15:45,446 INFO L93 Difference]: Finished difference Result 3129 states and 3647 transitions. [2022-11-23 16:15:45,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-23 16:15:45,446 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 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 63 [2022-11-23 16:15:45,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:15:45,451 INFO L225 Difference]: With dead ends: 3129 [2022-11-23 16:15:45,451 INFO L226 Difference]: Without dead ends: 3129 [2022-11-23 16:15:45,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 149 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=493, Invalid=3047, Unknown=0, NotChecked=0, Total=3540 [2022-11-23 16:15:45,452 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 437 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 948 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 437 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 959 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 948 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:15:45,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [437 Valid, 358 Invalid, 959 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 948 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 16:15:45,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3129 states. [2022-11-23 16:15:45,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3129 to 2562. [2022-11-23 16:15:45,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2562 states, 2560 states have (on average 1.169921875) internal successors, (2995), 2561 states have internal predecessors, (2995), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:45,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2562 states to 2562 states and 2995 transitions. [2022-11-23 16:15:45,481 INFO L78 Accepts]: Start accepts. Automaton has 2562 states and 2995 transitions. Word has length 63 [2022-11-23 16:15:45,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:15:45,482 INFO L495 AbstractCegarLoop]: Abstraction has 2562 states and 2995 transitions. [2022-11-23 16:15:45,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:45,482 INFO L276 IsEmpty]: Start isEmpty. Operand 2562 states and 2995 transitions. [2022-11-23 16:15:45,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-23 16:15:45,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:15:45,486 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:15:45,492 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-11-23 16:15:45,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-23 16:15:45,692 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:15:45,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:15:45,693 INFO L85 PathProgramCache]: Analyzing trace with hash -453623175, now seen corresponding path program 17 times [2022-11-23 16:15:45,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:15:45,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343067356] [2022-11-23 16:15:45,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:15:45,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:15:45,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:46,771 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 49 proven. 185 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:46,771 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:15:46,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343067356] [2022-11-23 16:15:46,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343067356] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:15:46,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163648773] [2022-11-23 16:15:46,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:15:46,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:46,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:15:46,773 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:15:46,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-23 16:15:47,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-23 16:15:47,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:15:47,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-23 16:15:47,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:15:47,802 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:47,802 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:48,469 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 7 treesize of output 5 [2022-11-23 16:15:48,723 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:15:48,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163648773] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:48,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910722676] [2022-11-23 16:15:48,725 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:15:48,725 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:48,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:48,725 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:48,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:48,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:48,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:15:48,787 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 14 treesize of output 10 [2022-11-23 16:15:48,822 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 14 treesize of output 10 [2022-11-23 16:15:48,844 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 14 treesize of output 10 [2022-11-23 16:15:48,881 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 14 treesize of output 10 [2022-11-23 16:15:48,921 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 14 treesize of output 10 [2022-11-23 16:15:48,953 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 14 treesize of output 10 [2022-11-23 16:15:48,973 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 14 treesize of output 10 [2022-11-23 16:15:49,014 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 14 treesize of output 10 [2022-11-23 16:15:49,050 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:15:49,050 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 25 treesize of output 24 [2022-11-23 16:15:49,192 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:15:52,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56595#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:15:52,684 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:15:52,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:15:52,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 57 [2022-11-23 16:15:52,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940281853] [2022-11-23 16:15:52,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:15:52,685 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-23 16:15:52,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:15:52,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-23 16:15:52,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=4542, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:15:52,685 INFO L87 Difference]: Start difference. First operand 2562 states and 2995 transitions. Second operand has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:55,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:15:55,463 INFO L93 Difference]: Finished difference Result 3145 states and 3594 transitions. [2022-11-23 16:15:55,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 16:15:55,463 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 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 65 [2022-11-23 16:15:55,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:15:55,471 INFO L225 Difference]: With dead ends: 3145 [2022-11-23 16:15:55,472 INFO L226 Difference]: Without dead ends: 3145 [2022-11-23 16:15:55,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 135 SyntacticMatches, 10 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3101 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=1291, Invalid=7265, Unknown=0, NotChecked=0, Total=8556 [2022-11-23 16:15:55,474 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 885 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 2829 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 885 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 2854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2829 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-23 16:15:55,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [885 Valid, 541 Invalid, 2854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2829 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-23 16:15:55,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3145 states. [2022-11-23 16:15:55,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3145 to 2614. [2022-11-23 16:15:55,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2614 states, 2612 states have (on average 1.1711332312404288) internal successors, (3059), 2613 states have internal predecessors, (3059), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:55,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2614 states to 2614 states and 3059 transitions. [2022-11-23 16:15:55,504 INFO L78 Accepts]: Start accepts. Automaton has 2614 states and 3059 transitions. Word has length 65 [2022-11-23 16:15:55,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:15:55,505 INFO L495 AbstractCegarLoop]: Abstraction has 2614 states and 3059 transitions. [2022-11-23 16:15:55,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:15:55,505 INFO L276 IsEmpty]: Start isEmpty. Operand 2614 states and 3059 transitions. [2022-11-23 16:15:55,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 16:15:55,509 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:15:55,509 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:15:55,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-23 16:15:55,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-11-23 16:15:55,718 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:15:55,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:15:55,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1667864989, now seen corresponding path program 2 times [2022-11-23 16:15:55,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:15:55,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092951095] [2022-11-23 16:15:55,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:15:55,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:15:55,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:15:56,579 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 5 proven. 125 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 16:15:56,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:15:56,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092951095] [2022-11-23 16:15:56,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092951095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:15:56,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744254030] [2022-11-23 16:15:56,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:15:56,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:15:56,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:15:56,581 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:15:56,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-23 16:15:57,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-23 16:15:57,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:15:57,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-23 16:15:57,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:15:57,090 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 [2022-11-23 16:15:57,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-23 16:15:57,448 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 17 treesize of output 19 [2022-11-23 16:15:57,949 INFO L321 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2022-11-23 16:15:57,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2022-11-23 16:15:57,998 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 8 proven. 122 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 16:15:57,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:58,379 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:58,379 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-11-23 16:15:58,387 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:58,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-11-23 16:15:58,643 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 5 proven. 125 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 16:15:58,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744254030] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:58,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [352028387] [2022-11-23 16:15:58,644 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:15:58,644 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:58,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:58,645 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:58,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:58,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:58,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:15:58,729 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 7 [2022-11-23 16:15:58,773 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 14 treesize of output 10 [2022-11-23 16:15:58,815 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 14 treesize of output 10 [2022-11-23 16:15:58,857 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 7 [2022-11-23 16:15:58,914 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:15:58,914 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 90 treesize of output 89 [2022-11-23 16:15:58,965 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 14 treesize of output 10 [2022-11-23 16:15:58,992 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 14 treesize of output 10 [2022-11-23 16:15:59,102 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:15:59,102 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 177 treesize of output 181 [2022-11-23 16:15:59,268 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:15:59,269 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:16:00,684 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:16:04,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62843#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:16:04,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:16:04,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:16:04,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-11-23 16:16:04,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29704656] [2022-11-23 16:16:04,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:16:04,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 16:16:04,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:16:04,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 16:16:04,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=2465, Unknown=9, NotChecked=0, Total=2652 [2022-11-23 16:16:04,859 INFO L87 Difference]: Start difference. First operand 2614 states and 3059 transitions. Second operand has 37 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:06,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:16:06,687 INFO L93 Difference]: Finished difference Result 2906 states and 3350 transitions. [2022-11-23 16:16:06,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 16:16:06,688 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 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 67 [2022-11-23 16:16:06,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:16:06,692 INFO L225 Difference]: With dead ends: 2906 [2022-11-23 16:16:06,692 INFO L226 Difference]: Without dead ends: 2031 [2022-11-23 16:16:06,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 163 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=358, Invalid=3923, Unknown=9, NotChecked=0, Total=4290 [2022-11-23 16:16:06,694 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 366 mSDsluCounter, 775 mSDsCounter, 0 mSdLazyCounter, 1563 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 1575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:16:06,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [366 Valid, 821 Invalid, 1575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1563 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 16:16:06,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2031 states. [2022-11-23 16:16:06,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2031 to 1752. [2022-11-23 16:16:06,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1752 states, 1750 states have (on average 1.1748571428571428) internal successors, (2056), 1751 states have internal predecessors, (2056), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:06,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1752 states to 1752 states and 2056 transitions. [2022-11-23 16:16:06,721 INFO L78 Accepts]: Start accepts. Automaton has 1752 states and 2056 transitions. Word has length 67 [2022-11-23 16:16:06,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:16:06,721 INFO L495 AbstractCegarLoop]: Abstraction has 1752 states and 2056 transitions. [2022-11-23 16:16:06,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:06,722 INFO L276 IsEmpty]: Start isEmpty. Operand 1752 states and 2056 transitions. [2022-11-23 16:16:06,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-23 16:16:06,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:16:06,724 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:16:06,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-23 16:16:06,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-23 16:16:06,932 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:16:06,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:16:06,932 INFO L85 PathProgramCache]: Analyzing trace with hash 624161792, now seen corresponding path program 18 times [2022-11-23 16:16:06,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:16:06,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390715140] [2022-11-23 16:16:06,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:16:06,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:16:06,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:08,098 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:08,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:16:08,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390715140] [2022-11-23 16:16:08,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390715140] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:16:08,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667336851] [2022-11-23 16:16:08,099 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:16:08,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:08,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:16:08,100 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:16:08,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-23 16:16:08,413 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:16:08,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:16:08,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-23 16:16:08,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:16:08,848 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 14 treesize of output 10 [2022-11-23 16:16:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:09,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:16:09,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:16:09,321 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 16 treesize of output 12 [2022-11-23 16:16:09,544 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:09,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667336851] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:16:09,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [385304446] [2022-11-23 16:16:09,545 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:16:09,546 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:16:09,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:16:09,546 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:16:09,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:16:09,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:16:09,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:16:09,609 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 7 [2022-11-23 16:16:09,648 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 14 treesize of output 10 [2022-11-23 16:16:09,680 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 14 treesize of output 10 [2022-11-23 16:16:09,722 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 14 treesize of output 10 [2022-11-23 16:16:09,759 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 91 treesize of output 83 [2022-11-23 16:16:09,816 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 14 treesize of output 10 [2022-11-23 16:16:09,849 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 14 treesize of output 10 [2022-11-23 16:16:09,887 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 14 treesize of output 10 [2022-11-23 16:16:09,943 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:16:09,943 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 25 treesize of output 24 [2022-11-23 16:16:10,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:16:14,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67997#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:16:14,143 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:16:14,143 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:16:14,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2022-11-23 16:16:14,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940226554] [2022-11-23 16:16:14,144 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:16:14,144 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-23 16:16:14,144 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:16:14,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-23 16:16:14,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=3208, Unknown=0, NotChecked=0, Total=3422 [2022-11-23 16:16:14,145 INFO L87 Difference]: Start difference. First operand 1752 states and 2056 transitions. Second operand has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:18,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:16:18,021 INFO L93 Difference]: Finished difference Result 2584 states and 2964 transitions. [2022-11-23 16:16:18,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 16:16:18,021 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 states have internal predecessors, (112), 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 69 [2022-11-23 16:16:18,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:16:18,024 INFO L225 Difference]: With dead ends: 2584 [2022-11-23 16:16:18,024 INFO L226 Difference]: Without dead ends: 2217 [2022-11-23 16:16:18,025 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 171 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=493, Invalid=6149, Unknown=0, NotChecked=0, Total=6642 [2022-11-23 16:16:18,026 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 600 mSDsluCounter, 2183 mSDsCounter, 0 mSdLazyCounter, 4726 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 600 SdHoareTripleChecker+Valid, 2276 SdHoareTripleChecker+Invalid, 4738 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 4726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-23 16:16:18,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [600 Valid, 2276 Invalid, 4738 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 4726 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-23 16:16:18,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2217 states. [2022-11-23 16:16:18,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2217 to 2011. [2022-11-23 16:16:18,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2011 states, 2009 states have (on average 1.1772025883524142) internal successors, (2365), 2010 states have internal predecessors, (2365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:18,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2011 states to 2011 states and 2365 transitions. [2022-11-23 16:16:18,052 INFO L78 Accepts]: Start accepts. Automaton has 2011 states and 2365 transitions. Word has length 69 [2022-11-23 16:16:18,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:16:18,053 INFO L495 AbstractCegarLoop]: Abstraction has 2011 states and 2365 transitions. [2022-11-23 16:16:18,053 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:18,053 INFO L276 IsEmpty]: Start isEmpty. Operand 2011 states and 2365 transitions. [2022-11-23 16:16:18,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-23 16:16:18,055 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:16:18,056 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:16:18,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-23 16:16:18,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:18,263 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:16:18,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:16:18,263 INFO L85 PathProgramCache]: Analyzing trace with hash 427949454, now seen corresponding path program 19 times [2022-11-23 16:16:18,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:16:18,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719172780] [2022-11-23 16:16:18,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:16:18,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:16:18,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:19,399 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 64 proven. 226 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:19,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:16:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719172780] [2022-11-23 16:16:19,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719172780] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:16:19,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141305604] [2022-11-23 16:16:19,400 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:16:19,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:19,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:16:19,401 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:16:19,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-23 16:16:19,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:19,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-23 16:16:19,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:16:20,257 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:20,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:16:21,038 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 5 treesize of output 3 [2022-11-23 16:16:21,371 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:21,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141305604] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:16:21,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218797476] [2022-11-23 16:16:21,373 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:16:21,373 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:16:21,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:16:21,374 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:16:21,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:16:21,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:16:21,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:16:21,444 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 7 [2022-11-23 16:16:21,483 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 14 treesize of output 10 [2022-11-23 16:16:21,517 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 14 treesize of output 10 [2022-11-23 16:16:21,568 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 7 [2022-11-23 16:16:21,625 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:16:21,626 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 90 treesize of output 89 [2022-11-23 16:16:21,688 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 14 treesize of output 10 [2022-11-23 16:16:21,719 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 14 treesize of output 10 [2022-11-23 16:16:21,819 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:16:21,819 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 177 treesize of output 181 [2022-11-23 16:16:22,022 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:16:22,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:16:22,962 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:16:29,835 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73125#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:16:29,835 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:16:29,835 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:16:29,836 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 52 [2022-11-23 16:16:29,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445227070] [2022-11-23 16:16:29,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:16:29,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-23 16:16:29,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:16:29,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-23 16:16:29,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=4006, Unknown=0, NotChecked=0, Total=4422 [2022-11-23 16:16:29,837 INFO L87 Difference]: Start difference. First operand 2011 states and 2365 transitions. Second operand has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:33,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:16:33,836 INFO L93 Difference]: Finished difference Result 2543 states and 2908 transitions. [2022-11-23 16:16:33,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-23 16:16:33,837 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 states have internal predecessors, (150), 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 71 [2022-11-23 16:16:33,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:16:33,840 INFO L225 Difference]: With dead ends: 2543 [2022-11-23 16:16:33,840 INFO L226 Difference]: Without dead ends: 2543 [2022-11-23 16:16:33,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 159 SyntacticMatches, 11 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2612 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=1187, Invalid=6823, Unknown=0, NotChecked=0, Total=8010 [2022-11-23 16:16:33,841 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 699 mSDsluCounter, 746 mSDsCounter, 0 mSdLazyCounter, 4025 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 699 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 4040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 4025 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-23 16:16:33,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [699 Valid, 791 Invalid, 4040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 4025 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-23 16:16:33,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2543 states. [2022-11-23 16:16:33,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2543 to 2055. [2022-11-23 16:16:33,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2055 states, 2053 states have (on average 1.178275694106186) internal successors, (2419), 2054 states have internal predecessors, (2419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:33,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2055 states to 2055 states and 2419 transitions. [2022-11-23 16:16:33,872 INFO L78 Accepts]: Start accepts. Automaton has 2055 states and 2419 transitions. Word has length 71 [2022-11-23 16:16:33,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:16:33,873 INFO L495 AbstractCegarLoop]: Abstraction has 2055 states and 2419 transitions. [2022-11-23 16:16:33,873 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:33,873 INFO L276 IsEmpty]: Start isEmpty. Operand 2055 states and 2419 transitions. [2022-11-23 16:16:33,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-23 16:16:33,875 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:16:33,875 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:16:33,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-23 16:16:34,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:34,082 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:16:34,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:16:34,083 INFO L85 PathProgramCache]: Analyzing trace with hash 670563883, now seen corresponding path program 10 times [2022-11-23 16:16:34,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:16:34,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993743797] [2022-11-23 16:16:34,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:16:34,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:16:34,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:35,312 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 6 proven. 160 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:35,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:16:35,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993743797] [2022-11-23 16:16:35,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993743797] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:16:35,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109993017] [2022-11-23 16:16:35,313 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:16:35,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:35,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:16:35,317 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:16:35,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-23 16:16:35,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:35,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-23 16:16:35,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:16:35,787 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 14 treesize of output 10 [2022-11-23 16:16:35,865 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:16:35,866 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 25 treesize of output 24 [2022-11-23 16:16:36,675 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 16:16:36,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 10 [2022-11-23 16:16:36,722 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 41 proven. 125 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:36,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:16:37,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 38 [2022-11-23 16:16:37,576 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 41 proven. 125 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:37,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109993017] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:16:37,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755501044] [2022-11-23 16:16:37,578 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:16:37,578 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:16:37,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:16:37,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:16:37,579 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:16:37,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:16:37,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:16:37,641 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 14 treesize of output 10 [2022-11-23 16:16:37,679 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 14 treesize of output 10 [2022-11-23 16:16:37,701 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 14 treesize of output 10 [2022-11-23 16:16:37,749 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 7 [2022-11-23 16:16:37,779 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 14 treesize of output 10 [2022-11-23 16:16:37,803 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 14 treesize of output 10 [2022-11-23 16:16:37,844 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 14 treesize of output 10 [2022-11-23 16:16:37,897 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:16:37,897 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 25 treesize of output 24 [2022-11-23 16:16:38,240 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:16:45,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '78258#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:16:45,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:16:45,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:16:45,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 17, 17] total 48 [2022-11-23 16:16:45,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734886348] [2022-11-23 16:16:45,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:16:45,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-23 16:16:45,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:16:45,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-23 16:16:45,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=3816, Unknown=0, NotChecked=0, Total=4032 [2022-11-23 16:16:45,354 INFO L87 Difference]: Start difference. First operand 2055 states and 2419 transitions. Second operand has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:49,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:16:49,364 INFO L93 Difference]: Finished difference Result 4901 states and 5715 transitions. [2022-11-23 16:16:49,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-23 16:16:49,364 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 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 72 [2022-11-23 16:16:49,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:16:49,368 INFO L225 Difference]: With dead ends: 4901 [2022-11-23 16:16:49,368 INFO L226 Difference]: Without dead ends: 2836 [2022-11-23 16:16:49,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 167 SyntacticMatches, 8 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 7 DeprecatedPredicates, 1773 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=557, Invalid=7099, Unknown=0, NotChecked=0, Total=7656 [2022-11-23 16:16:49,369 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 710 mSDsluCounter, 1211 mSDsCounter, 0 mSdLazyCounter, 2892 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 710 SdHoareTripleChecker+Valid, 1262 SdHoareTripleChecker+Invalid, 2901 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:16:49,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [710 Valid, 1262 Invalid, 2901 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2892 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-23 16:16:49,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2836 states. [2022-11-23 16:16:49,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2836 to 2057. [2022-11-23 16:16:49,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2057 states, 2055 states have (on average 1.1785888077858881) internal successors, (2422), 2056 states have internal predecessors, (2422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:49,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2057 states to 2057 states and 2422 transitions. [2022-11-23 16:16:49,408 INFO L78 Accepts]: Start accepts. Automaton has 2057 states and 2422 transitions. Word has length 72 [2022-11-23 16:16:49,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:16:49,409 INFO L495 AbstractCegarLoop]: Abstraction has 2057 states and 2422 transitions. [2022-11-23 16:16:49,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:16:49,409 INFO L276 IsEmpty]: Start isEmpty. Operand 2057 states and 2422 transitions. [2022-11-23 16:16:49,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-23 16:16:49,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:16:49,412 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:16:49,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-23 16:16:49,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-23 16:16:49,621 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:16:49,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:16:49,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1966363231, now seen corresponding path program 11 times [2022-11-23 16:16:49,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:16:49,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903920379] [2022-11-23 16:16:49,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:16:49,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:16:49,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:16:50,426 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 16 proven. 161 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:50,426 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:16:50,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903920379] [2022-11-23 16:16:50,427 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903920379] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:16:50,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607878849] [2022-11-23 16:16:50,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:16:50,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:16:50,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:16:50,431 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:16:50,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-23 16:16:50,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-23 16:16:50,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:16:50,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-23 16:16:50,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:16:51,513 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 25 proven. 152 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:51,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:16:52,178 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 7 treesize of output 5 [2022-11-23 16:16:52,361 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 25 proven. 152 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:16:52,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607878849] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:16:52,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696486158] [2022-11-23 16:16:52,363 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:16:52,363 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:16:52,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:16:52,364 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:16:52,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:16:52,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:16:52,410 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:16:52,452 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 7 [2022-11-23 16:16:52,495 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 14 treesize of output 10 [2022-11-23 16:16:52,537 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 14 treesize of output 10 [2022-11-23 16:16:52,574 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 7 [2022-11-23 16:16:52,641 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:16:52,641 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 90 treesize of output 89 [2022-11-23 16:16:52,714 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 14 treesize of output 10 [2022-11-23 16:16:52,739 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 14 treesize of output 10 [2022-11-23 16:16:52,854 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:16:52,855 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 177 treesize of output 181 [2022-11-23 16:16:53,044 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:16:53,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:16:54,650 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:16:59,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85759#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:16:59,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:16:59,319 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:16:59,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 40 [2022-11-23 16:16:59,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861390439] [2022-11-23 16:16:59,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:16:59,320 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-23 16:16:59,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:16:59,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-23 16:16:59,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=2847, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 16:16:59,320 INFO L87 Difference]: Start difference. First operand 2057 states and 2422 transitions. Second operand has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:00,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:17:00,549 INFO L93 Difference]: Finished difference Result 3174 states and 3712 transitions. [2022-11-23 16:17:00,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-23 16:17:00,549 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 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 74 [2022-11-23 16:17:00,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:17:00,553 INFO L225 Difference]: With dead ends: 3174 [2022-11-23 16:17:00,553 INFO L226 Difference]: Without dead ends: 3174 [2022-11-23 16:17:00,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1703 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=721, Invalid=4391, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:17:00,554 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 793 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 1066 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 793 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 1078 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1066 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 16:17:00,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [793 Valid, 441 Invalid, 1078 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1066 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 16:17:00,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3174 states. [2022-11-23 16:17:00,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3174 to 2332. [2022-11-23 16:17:00,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2332 states, 2330 states have (on average 1.1781115879828326) internal successors, (2745), 2331 states have internal predecessors, (2745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:00,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2332 states to 2332 states and 2745 transitions. [2022-11-23 16:17:00,595 INFO L78 Accepts]: Start accepts. Automaton has 2332 states and 2745 transitions. Word has length 74 [2022-11-23 16:17:00,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:17:00,595 INFO L495 AbstractCegarLoop]: Abstraction has 2332 states and 2745 transitions. [2022-11-23 16:17:00,596 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:00,596 INFO L276 IsEmpty]: Start isEmpty. Operand 2332 states and 2745 transitions. [2022-11-23 16:17:00,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-23 16:17:00,598 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:17:00,598 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:17:00,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-23 16:17:00,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:00,806 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:17:00,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:17:00,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1754406037, now seen corresponding path program 20 times [2022-11-23 16:17:00,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:17:00,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801014778] [2022-11-23 16:17:00,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:17:00,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:17:00,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:01,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:17:01,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801014778] [2022-11-23 16:17:01,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [801014778] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:17:01,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660603180] [2022-11-23 16:17:01,946 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:17:01,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:01,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:17:01,948 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:17:01,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-23 16:17:02,704 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-23 16:17:02,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:17:02,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-23 16:17:02,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:17:02,914 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 13 treesize of output 9 [2022-11-23 16:17:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:03,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:17:03,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:17:03,594 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 16 treesize of output 12 [2022-11-23 16:17:04,127 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:04,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660603180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:17:04,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [334514851] [2022-11-23 16:17:04,128 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:17:04,128 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:17:04,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:17:04,129 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:17:04,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:17:04,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:17:04,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:17:04,184 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 7 [2022-11-23 16:17:04,219 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 14 treesize of output 10 [2022-11-23 16:17:04,259 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 14 treesize of output 10 [2022-11-23 16:17:04,307 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 14 treesize of output 10 [2022-11-23 16:17:04,344 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 91 treesize of output 83 [2022-11-23 16:17:04,389 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 14 treesize of output 10 [2022-11-23 16:17:04,422 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 14 treesize of output 10 [2022-11-23 16:17:04,460 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 14 treesize of output 10 [2022-11-23 16:17:04,501 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:17:04,501 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 25 treesize of output 24 [2022-11-23 16:17:04,661 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:17:08,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91809#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:17:08,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:17:08,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:17:08,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-11-23 16:17:08,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56318470] [2022-11-23 16:17:08,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:17:08,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-23 16:17:08,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:17:08,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-23 16:17:08,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=4452, Unknown=0, NotChecked=0, Total=4692 [2022-11-23 16:17:08,967 INFO L87 Difference]: Start difference. First operand 2332 states and 2745 transitions. Second operand has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:13,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:17:13,847 INFO L93 Difference]: Finished difference Result 3332 states and 3839 transitions. [2022-11-23 16:17:13,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 16:17:13,847 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 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 [2022-11-23 16:17:13,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:17:13,851 INFO L225 Difference]: With dead ends: 3332 [2022-11-23 16:17:13,851 INFO L226 Difference]: Without dead ends: 2927 [2022-11-23 16:17:13,852 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2097 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=514, Invalid=8042, Unknown=0, NotChecked=0, Total=8556 [2022-11-23 16:17:13,852 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 713 mSDsluCounter, 2919 mSDsCounter, 0 mSdLazyCounter, 6299 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 713 SdHoareTripleChecker+Valid, 3023 SdHoareTripleChecker+Invalid, 6311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 6299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:17:13,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [713 Valid, 3023 Invalid, 6311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 6299 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-23 16:17:13,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2927 states. [2022-11-23 16:17:13,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2927 to 2660. [2022-11-23 16:17:13,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2660 states, 2658 states have (on average 1.18058690744921) internal successors, (3138), 2659 states have internal predecessors, (3138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:13,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2660 states to 2660 states and 3138 transitions. [2022-11-23 16:17:13,878 INFO L78 Accepts]: Start accepts. Automaton has 2660 states and 3138 transitions. Word has length 75 [2022-11-23 16:17:13,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:17:13,878 INFO L495 AbstractCegarLoop]: Abstraction has 2660 states and 3138 transitions. [2022-11-23 16:17:13,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:13,878 INFO L276 IsEmpty]: Start isEmpty. Operand 2660 states and 3138 transitions. [2022-11-23 16:17:13,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-23 16:17:13,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:17:13,880 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:17:13,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-23 16:17:14,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-23 16:17:14,081 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:17:14,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:17:14,081 INFO L85 PathProgramCache]: Analyzing trace with hash -634764381, now seen corresponding path program 21 times [2022-11-23 16:17:14,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:17:14,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13092270] [2022-11-23 16:17:14,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:17:14,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:17:14,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:15,102 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 81 proven. 271 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:15,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:17:15,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13092270] [2022-11-23 16:17:15,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13092270] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:17:15,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059194381] [2022-11-23 16:17:15,103 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:17:15,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:15,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:17:15,104 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:17:15,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-23 16:17:15,415 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:17:15,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:17:15,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-23 16:17:15,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:17:15,438 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:17:15,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:17:16,105 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:16,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:17:17,701 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:17,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059194381] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:17:17,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459059060] [2022-11-23 16:17:17,702 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:17:17,702 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:17:17,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:17:17,703 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:17:17,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:17:17,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:17:17,724 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:17:17,757 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 14 treesize of output 10 [2022-11-23 16:17:17,795 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 14 treesize of output 10 [2022-11-23 16:17:17,820 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 14 treesize of output 10 [2022-11-23 16:17:17,863 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 7 [2022-11-23 16:17:17,904 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 14 treesize of output 10 [2022-11-23 16:17:17,928 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 14 treesize of output 10 [2022-11-23 16:17:17,965 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 14 treesize of output 10 [2022-11-23 16:17:18,013 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:17:18,014 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 25 treesize of output 24 [2022-11-23 16:17:18,325 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:17:23,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98388#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:17:23,441 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:17:23,441 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:17:23,441 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 68 [2022-11-23 16:17:23,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393069790] [2022-11-23 16:17:23,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:17:23,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-23 16:17:23,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:17:23,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-23 16:17:23,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=6093, Unknown=0, NotChecked=0, Total=6806 [2022-11-23 16:17:23,442 INFO L87 Difference]: Start difference. First operand 2660 states and 3138 transitions. Second operand has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:27,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:17:27,557 INFO L93 Difference]: Finished difference Result 3288 states and 3778 transitions. [2022-11-23 16:17:27,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-23 16:17:27,558 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 states have internal predecessors, (187), 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 77 [2022-11-23 16:17:27,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:17:27,563 INFO L225 Difference]: With dead ends: 3288 [2022-11-23 16:17:27,563 INFO L226 Difference]: Without dead ends: 3288 [2022-11-23 16:17:27,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3267 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1858, Invalid=9698, Unknown=0, NotChecked=0, Total=11556 [2022-11-23 16:17:27,565 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 787 mSDsluCounter, 1104 mSDsCounter, 0 mSdLazyCounter, 5226 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 787 SdHoareTripleChecker+Valid, 1162 SdHoareTripleChecker+Invalid, 5235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 5226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-11-23 16:17:27,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [787 Valid, 1162 Invalid, 5235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 5226 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-11-23 16:17:27,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3288 states. [2022-11-23 16:17:27,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3288 to 2708. [2022-11-23 16:17:27,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2708 states, 2706 states have (on average 1.1814486326681448) internal successors, (3197), 2707 states have internal predecessors, (3197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:27,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2708 states to 2708 states and 3197 transitions. [2022-11-23 16:17:27,602 INFO L78 Accepts]: Start accepts. Automaton has 2708 states and 3197 transitions. Word has length 77 [2022-11-23 16:17:27,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:17:27,603 INFO L495 AbstractCegarLoop]: Abstraction has 2708 states and 3197 transitions. [2022-11-23 16:17:27,603 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:27,603 INFO L276 IsEmpty]: Start isEmpty. Operand 2708 states and 3197 transitions. [2022-11-23 16:17:27,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-23 16:17:27,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:17:27,606 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:17:27,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-23 16:17:27,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:27,813 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:17:27,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:17:27,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1892634666, now seen corresponding path program 22 times [2022-11-23 16:17:27,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:17:27,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827967526] [2022-11-23 16:17:27,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:17:27,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:17:27,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:29,053 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:29,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:17:29,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827967526] [2022-11-23 16:17:29,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827967526] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:17:29,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553650563] [2022-11-23 16:17:29,053 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:17:29,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:29,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:17:29,055 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:17:29,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-23 16:17:29,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:29,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-23 16:17:29,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:17:29,714 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 14 treesize of output 10 [2022-11-23 16:17:29,992 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:29,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:17:30,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-23 16:17:30,162 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 16 treesize of output 12 [2022-11-23 16:17:30,371 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:30,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553650563] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:17:30,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [343944539] [2022-11-23 16:17:30,372 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:17:30,372 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:17:30,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:17:30,373 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:17:30,373 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:17:30,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:17:30,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:17:30,427 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 14 treesize of output 10 [2022-11-23 16:17:30,461 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 14 treesize of output 10 [2022-11-23 16:17:30,484 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 14 treesize of output 10 [2022-11-23 16:17:30,545 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 14 treesize of output 10 [2022-11-23 16:17:30,583 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 14 treesize of output 10 [2022-11-23 16:17:30,615 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 14 treesize of output 10 [2022-11-23 16:17:30,634 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 14 treesize of output 10 [2022-11-23 16:17:30,672 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 14 treesize of output 10 [2022-11-23 16:17:30,724 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:17:30,724 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 25 treesize of output 24 [2022-11-23 16:17:30,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:17:35,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104979#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:17:35,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:17:35,143 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:17:35,143 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2022-11-23 16:17:35,143 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706790560] [2022-11-23 16:17:35,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:17:35,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-23 16:17:35,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:17:35,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-23 16:17:35,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=3930, Unknown=0, NotChecked=0, Total=4160 [2022-11-23 16:17:35,144 INFO L87 Difference]: Start difference. First operand 2708 states and 3197 transitions. Second operand has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:40,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:17:40,311 INFO L93 Difference]: Finished difference Result 3801 states and 4394 transitions. [2022-11-23 16:17:40,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-23 16:17:40,312 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 states have internal predecessors, (128), 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 81 [2022-11-23 16:17:40,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:17:40,317 INFO L225 Difference]: With dead ends: 3801 [2022-11-23 16:17:40,317 INFO L226 Difference]: Without dead ends: 3360 [2022-11-23 16:17:40,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 205 SyntacticMatches, 3 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=555, Invalid=7817, Unknown=0, NotChecked=0, Total=8372 [2022-11-23 16:17:40,318 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 817 mSDsluCounter, 2838 mSDsCounter, 0 mSdLazyCounter, 6009 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 817 SdHoareTripleChecker+Valid, 2953 SdHoareTripleChecker+Invalid, 6022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 6009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:17:40,319 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [817 Valid, 2953 Invalid, 6022 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 6009 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-11-23 16:17:40,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3360 states. [2022-11-23 16:17:40,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3360 to 3064. [2022-11-23 16:17:40,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3064 states, 3062 states have (on average 1.1838667537557153) internal successors, (3625), 3063 states have internal predecessors, (3625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:40,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3064 states to 3064 states and 3625 transitions. [2022-11-23 16:17:40,384 INFO L78 Accepts]: Start accepts. Automaton has 3064 states and 3625 transitions. Word has length 81 [2022-11-23 16:17:40,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:17:40,384 INFO L495 AbstractCegarLoop]: Abstraction has 3064 states and 3625 transitions. [2022-11-23 16:17:40,384 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:40,385 INFO L276 IsEmpty]: Start isEmpty. Operand 3064 states and 3625 transitions. [2022-11-23 16:17:40,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-23 16:17:40,387 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:17:40,388 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:17:40,395 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-23 16:17:40,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:40,595 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:17:40,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:17:40,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1208317112, now seen corresponding path program 23 times [2022-11-23 16:17:40,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:17:40,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119294527] [2022-11-23 16:17:40,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:17:40,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:17:40,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:41,891 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 100 proven. 320 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:41,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:17:41,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119294527] [2022-11-23 16:17:41,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119294527] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:17:41,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939953268] [2022-11-23 16:17:41,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:17:41,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:41,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:17:41,893 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:17:41,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-23 16:17:42,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-23 16:17:42,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:17:42,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-23 16:17:42,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:17:42,429 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:17:42,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:17:43,526 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:43,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:17:45,284 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:45,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939953268] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:17:45,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825545430] [2022-11-23 16:17:45,286 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-23 16:17:45,286 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:17:45,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:17:45,286 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:17:45,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:17:45,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:17:45,309 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:17:45,345 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 7 [2022-11-23 16:17:45,391 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 14 treesize of output 10 [2022-11-23 16:17:45,421 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 14 treesize of output 10 [2022-11-23 16:17:45,458 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 14 treesize of output 10 [2022-11-23 16:17:45,496 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 91 treesize of output 83 [2022-11-23 16:17:45,539 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 14 treesize of output 10 [2022-11-23 16:17:45,573 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 14 treesize of output 10 [2022-11-23 16:17:45,612 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 14 treesize of output 10 [2022-11-23 16:17:45,655 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:17:45,656 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 25 treesize of output 24 [2022-11-23 16:17:45,818 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:17:49,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112490#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:17:49,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:17:49,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:17:49,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 85 [2022-11-23 16:17:49,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630086280] [2022-11-23 16:17:49,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:17:49,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-11-23 16:17:49,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:17:49,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-11-23 16:17:49,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1126, Invalid=8774, Unknown=0, NotChecked=0, Total=9900 [2022-11-23 16:17:49,956 INFO L87 Difference]: Start difference. First operand 3064 states and 3625 transitions. Second operand has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:54,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:17:54,767 INFO L93 Difference]: Finished difference Result 3737 states and 4309 transitions. [2022-11-23 16:17:54,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-23 16:17:54,767 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 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 83 [2022-11-23 16:17:54,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:17:54,771 INFO L225 Difference]: With dead ends: 3737 [2022-11-23 16:17:54,771 INFO L226 Difference]: Without dead ends: 3737 [2022-11-23 16:17:54,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5182 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=2561, Invalid=13441, Unknown=0, NotChecked=0, Total=16002 [2022-11-23 16:17:54,773 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 1035 mSDsluCounter, 896 mSDsCounter, 0 mSdLazyCounter, 4994 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1035 SdHoareTripleChecker+Valid, 949 SdHoareTripleChecker+Invalid, 5016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 4994 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:17:54,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1035 Valid, 949 Invalid, 5016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 4994 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-11-23 16:17:54,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3737 states. [2022-11-23 16:17:54,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3737 to 3112. [2022-11-23 16:17:54,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3112 states, 3110 states have (on average 1.184565916398714) internal successors, (3684), 3111 states have internal predecessors, (3684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:54,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3112 states to 3112 states and 3684 transitions. [2022-11-23 16:17:54,823 INFO L78 Accepts]: Start accepts. Automaton has 3112 states and 3684 transitions. Word has length 83 [2022-11-23 16:17:54,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:17:54,823 INFO L495 AbstractCegarLoop]: Abstraction has 3112 states and 3684 transitions. [2022-11-23 16:17:54,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:17:54,824 INFO L276 IsEmpty]: Start isEmpty. Operand 3112 states and 3684 transitions. [2022-11-23 16:17:54,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-11-23 16:17:54,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:17:54,827 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:17:54,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-11-23 16:17:55,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:55,056 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:17:55,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:17:55,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1562204932, now seen corresponding path program 12 times [2022-11-23 16:17:55,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:17:55,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081999295] [2022-11-23 16:17:55,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:17:55,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:17:55,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:17:56,202 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 7 proven. 225 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:17:56,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:17:56,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081999295] [2022-11-23 16:17:56,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081999295] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:17:56,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678934216] [2022-11-23 16:17:56,203 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:17:56,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:17:56,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:17:56,204 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:17:56,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-23 16:17:56,501 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:17:56,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:17:56,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-23 16:17:56,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:17:56,923 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 14 treesize of output 10 [2022-11-23 16:17:57,018 INFO L321 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-11-23 16:17:57,018 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 24 treesize of output 23 [2022-11-23 16:18:00,622 INFO L321 Elim1Store]: treesize reduction 102, result has 27.7 percent of original size [2022-11-23 16:18:00,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 70 treesize of output 61 [2022-11-23 16:18:00,691 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 7 proven. 225 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:00,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:18:01,991 INFO L321 Elim1Store]: treesize reduction 55, result has 42.1 percent of original size [2022-11-23 16:18:01,991 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 512 treesize of output 399 [2022-11-23 16:18:02,011 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:18:02,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 357 treesize of output 331 [2022-11-23 16:18:02,034 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 370 treesize of output 346 [2022-11-23 16:18:02,232 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:18:02,328 INFO L321 Elim1Store]: treesize reduction 10, result has 82.5 percent of original size [2022-11-23 16:18:02,328 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 143 treesize of output 142 [2022-11-23 16:18:03,611 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 34 proven. 198 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:03,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678934216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:18:03,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027354327] [2022-11-23 16:18:03,612 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:18:03,612 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:18:03,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:18:03,613 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:18:03,613 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:18:03,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:18:03,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:18:03,674 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 7 [2022-11-23 16:18:03,706 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 14 treesize of output 10 [2022-11-23 16:18:03,735 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 14 treesize of output 10 [2022-11-23 16:18:03,774 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 7 [2022-11-23 16:18:03,825 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-23 16:18:03,825 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 90 treesize of output 89 [2022-11-23 16:18:03,872 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 14 treesize of output 10 [2022-11-23 16:18:03,892 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 14 treesize of output 10 [2022-11-23 16:18:04,005 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-23 16:18:04,006 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 177 treesize of output 181 [2022-11-23 16:18:04,161 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-23 16:18:04,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-23 16:18:05,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:18:11,674 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119973#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:18:11,674 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:18:11,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:18:11,675 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 73 [2022-11-23 16:18:11,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355520504] [2022-11-23 16:18:11,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:18:11,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-23 16:18:11,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:18:11,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-23 16:18:11,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=7458, Unknown=0, NotChecked=0, Total=7832 [2022-11-23 16:18:11,676 INFO L87 Difference]: Start difference. First operand 3112 states and 3684 transitions. Second operand has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:24,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:18:24,132 INFO L93 Difference]: Finished difference Result 10649 states and 12547 transitions. [2022-11-23 16:18:24,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-23 16:18:24,133 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 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 83 [2022-11-23 16:18:24,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:18:24,138 INFO L225 Difference]: With dead ends: 10649 [2022-11-23 16:18:24,139 INFO L226 Difference]: Without dead ends: 10540 [2022-11-23 16:18:24,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4332 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=1350, Invalid=18110, Unknown=0, NotChecked=0, Total=19460 [2022-11-23 16:18:24,140 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 1434 mSDsluCounter, 1955 mSDsCounter, 0 mSdLazyCounter, 4991 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1434 SdHoareTripleChecker+Valid, 2018 SdHoareTripleChecker+Invalid, 5036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 4991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:18:24,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1434 Valid, 2018 Invalid, 5036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 4991 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-23 16:18:24,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10540 states. [2022-11-23 16:18:24,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10540 to 5545. [2022-11-23 16:18:24,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5545 states, 5543 states have (on average 1.1823922063864334) internal successors, (6554), 5544 states have internal predecessors, (6554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:24,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5545 states to 5545 states and 6554 transitions. [2022-11-23 16:18:24,215 INFO L78 Accepts]: Start accepts. Automaton has 5545 states and 6554 transitions. Word has length 83 [2022-11-23 16:18:24,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:18:24,215 INFO L495 AbstractCegarLoop]: Abstraction has 5545 states and 6554 transitions. [2022-11-23 16:18:24,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:24,215 INFO L276 IsEmpty]: Start isEmpty. Operand 5545 states and 6554 transitions. [2022-11-23 16:18:24,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-23 16:18:24,220 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:18:24,220 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:18:24,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-23 16:18:24,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:18:24,428 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:18:24,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:18:24,428 INFO L85 PathProgramCache]: Analyzing trace with hash 1243467718, now seen corresponding path program 13 times [2022-11-23 16:18:24,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:18:24,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547454797] [2022-11-23 16:18:24,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:18:24,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:18:24,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:18:25,069 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 25 proven. 220 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:25,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:18:25,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547454797] [2022-11-23 16:18:25,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547454797] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:18:25,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665553804] [2022-11-23 16:18:25,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-23 16:18:25,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:18:25,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:18:25,072 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:18:25,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-23 16:18:25,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:18:25,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-23 16:18:25,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:18:25,939 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 36 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:25,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:18:26,519 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 5 treesize of output 3 [2022-11-23 16:18:26,686 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 36 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:26,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665553804] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:18:26,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [737230837] [2022-11-23 16:18:26,687 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-23 16:18:26,687 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:18:26,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:18:26,688 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:18:26,688 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:18:26,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:18:26,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:18:26,743 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 7 [2022-11-23 16:18:26,774 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 14 treesize of output 10 [2022-11-23 16:18:26,805 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 14 treesize of output 10 [2022-11-23 16:18:26,845 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 14 treesize of output 10 [2022-11-23 16:18:26,887 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 91 treesize of output 83 [2022-11-23 16:18:26,927 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 14 treesize of output 10 [2022-11-23 16:18:26,986 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 14 treesize of output 10 [2022-11-23 16:18:27,031 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 14 treesize of output 10 [2022-11-23 16:18:27,089 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-23 16:18:27,090 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 25 treesize of output 24 [2022-11-23 16:18:27,360 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:18:31,212 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '136828#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-23 16:18:31,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:18:31,213 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:18:31,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 38 [2022-11-23 16:18:31,213 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943356566] [2022-11-23 16:18:31,213 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:18:31,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-23 16:18:31,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:18:31,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-23 16:18:31,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=2674, Unknown=0, NotChecked=0, Total=2970 [2022-11-23 16:18:31,214 INFO L87 Difference]: Start difference. First operand 5545 states and 6554 transitions. Second operand has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:32,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:18:32,718 INFO L93 Difference]: Finished difference Result 9101 states and 10750 transitions. [2022-11-23 16:18:32,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-23 16:18:32,719 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 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 85 [2022-11-23 16:18:32,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:18:32,726 INFO L225 Difference]: With dead ends: 9101 [2022-11-23 16:18:32,726 INFO L226 Difference]: Without dead ends: 9101 [2022-11-23 16:18:32,726 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 209 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1599 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=723, Invalid=4389, Unknown=0, NotChecked=0, Total=5112 [2022-11-23 16:18:32,727 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 441 mSDsluCounter, 606 mSDsCounter, 0 mSdLazyCounter, 1688 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 1697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:18:32,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 651 Invalid, 1697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1688 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 16:18:32,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9101 states. [2022-11-23 16:18:32,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9101 to 5922. [2022-11-23 16:18:32,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5922 states, 5920 states have (on average 1.1824324324324325) internal successors, (7000), 5921 states have internal predecessors, (7000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:32,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5922 states to 5922 states and 7000 transitions. [2022-11-23 16:18:32,826 INFO L78 Accepts]: Start accepts. Automaton has 5922 states and 7000 transitions. Word has length 85 [2022-11-23 16:18:32,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:18:32,826 INFO L495 AbstractCegarLoop]: Abstraction has 5922 states and 7000 transitions. [2022-11-23 16:18:32,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 16:18:32,827 INFO L276 IsEmpty]: Start isEmpty. Operand 5922 states and 7000 transitions. [2022-11-23 16:18:32,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-23 16:18:32,831 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:18:32,832 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:18:32,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-23 16:18:33,038 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-11-23 16:18:33,038 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-23 16:18:33,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:18:33,039 INFO L85 PathProgramCache]: Analyzing trace with hash 751955647, now seen corresponding path program 24 times [2022-11-23 16:18:33,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:18:33,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078870361] [2022-11-23 16:18:33,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:18:33,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:18:33,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:18:34,298 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 16:18:34,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:18:34,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078870361] [2022-11-23 16:18:34,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078870361] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:18:34,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353180824] [2022-11-23 16:18:34,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-23 16:18:34,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:18:34,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:18:34,303 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:18:34,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c0a258fd-37de-49dc-8705-0767f8da6de4/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-23 16:18:34,745 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-23 16:18:34,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:18:34,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 128 conjunts are in the unsatisfiable core [2022-11-23 16:18:34,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:18:35,378 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 14 treesize of output 10