./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrcmp-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrcmp-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI --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 382beab9cdcef42f6594628efe520684fdbc8c72ada26cb53ddf4918b8957d49 --- 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-5e519f3 [2022-11-03 03:33:07,812 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:33:07,814 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:33:07,845 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:33:07,846 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:33:07,847 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:33:07,848 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:33:07,850 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:33:07,852 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:33:07,853 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:33:07,854 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:33:07,855 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:33:07,856 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:33:07,857 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:33:07,858 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:33:07,860 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:33:07,861 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:33:07,862 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:33:07,865 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:33:07,867 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:33:07,869 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:33:07,870 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:33:07,872 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:33:07,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:33:07,877 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:33:07,878 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:33:07,878 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:33:07,879 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:33:07,880 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:33:07,881 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:33:07,881 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:33:07,882 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:33:07,883 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:33:07,884 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:33:07,885 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:33:07,886 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:33:07,887 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:33:07,887 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:33:07,887 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:33:07,888 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:33:07,889 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:33:07,895 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-03 03:33:07,935 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:33:07,935 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:33:07,936 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:33:07,936 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:33:07,937 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:33:07,937 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:33:07,937 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:33:07,937 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:33:07,938 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:33:07,938 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:33:07,939 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:33:07,939 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:33:07,939 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:33:07,940 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:33:07,940 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:33:07,940 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:33:07,940 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:33:07,940 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:33:07,941 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-03 03:33:07,941 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-03 03:33:07,942 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:33:07,942 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:33:07,942 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-03 03:33:07,942 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:33:07,942 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:33:07,943 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:33:07,943 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-03 03:33:07,943 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-03 03:33:07,943 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-03 03:33:07,944 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:33:07,944 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-03 03:33:07,944 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:33:07,944 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:33:07,945 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:33:07,945 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:33:07,946 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:33:07,947 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:33:07,947 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:33:07,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:33:07,951 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:33:07,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:33:07,952 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:33:07,952 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_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 382beab9cdcef42f6594628efe520684fdbc8c72ada26cb53ddf4918b8957d49 [2022-11-03 03:33:08,250 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:33:08,272 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:33:08,275 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:33:08,276 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:33:08,277 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:33:08,279 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/array-memsafety/cstrcmp-alloca-2.i [2022-11-03 03:33:08,364 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/data/cf25a35fd/942bf77b5ef54516b44a9ee682be2f95/FLAG17e570046 [2022-11-03 03:33:08,921 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:33:08,922 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/sv-benchmarks/c/array-memsafety/cstrcmp-alloca-2.i [2022-11-03 03:33:08,934 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/data/cf25a35fd/942bf77b5ef54516b44a9ee682be2f95/FLAG17e570046 [2022-11-03 03:33:09,185 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/data/cf25a35fd/942bf77b5ef54516b44a9ee682be2f95 [2022-11-03 03:33:09,188 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:33:09,190 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:33:09,191 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:33:09,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:33:09,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:33:09,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,198 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ad6edae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09, skipping insertion in model container [2022-11-03 03:33:09,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:33:09,239 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:33:09,696 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:33:09,709 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:33:09,769 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:33:09,804 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:33:09,805 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09 WrapperNode [2022-11-03 03:33:09,806 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:33:09,807 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:33:09,807 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:33:09,807 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:33:09,816 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,852 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,891 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2022-11-03 03:33:09,892 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:33:09,893 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:33:09,894 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:33:09,894 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:33:09,904 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,914 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,915 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,928 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,938 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,942 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,948 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,950 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:33:09,956 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:33:09,956 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:33:09,956 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:33:09,957 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (1/1) ... [2022-11-03 03:33:09,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:33:09,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:10,001 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:33:10,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:33:10,056 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-03 03:33:10,056 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-03 03:33:10,057 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-03 03:33:10,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-03 03:33:10,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:33:10,057 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:33:10,188 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:33:10,190 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:33:10,481 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:33:10,573 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:33:10,574 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 03:33:10,576 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:33:10 BoogieIcfgContainer [2022-11-03 03:33:10,576 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:33:10,578 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:33:10,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:33:10,594 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:33:10,595 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:33:09" (1/3) ... [2022-11-03 03:33:10,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@222be1d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:33:10, skipping insertion in model container [2022-11-03 03:33:10,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:33:09" (2/3) ... [2022-11-03 03:33:10,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@222be1d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:33:10, skipping insertion in model container [2022-11-03 03:33:10,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:33:10" (3/3) ... [2022-11-03 03:33:10,598 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrcmp-alloca-2.i [2022-11-03 03:33:10,638 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:33:10,638 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2022-11-03 03:33:10,704 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:33:10,711 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;@29b5bd22, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:33:10,711 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2022-11-03 03:33:10,716 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:10,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 03:33:10,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:10,723 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 03:33:10,724 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)] === [2022-11-03 03:33:10,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:10,730 INFO L85 PathProgramCache]: Analyzing trace with hash 155459, now seen corresponding path program 1 times [2022-11-03 03:33:10,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:10,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050116039] [2022-11-03 03:33:10,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:10,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:10,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:11,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:11,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:11,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050116039] [2022-11-03 03:33:11,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2050116039] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:11,226 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:11,226 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-03 03:33:11,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120529978] [2022-11-03 03:33:11,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:11,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:33:11,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:11,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:33:11,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:33:11,266 INFO L87 Difference]: Start difference. First operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2022-11-03 03:33:11,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:11,332 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-11-03 03:33:11,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:11,335 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 [2022-11-03 03:33:11,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:11,343 INFO L225 Difference]: With dead ends: 33 [2022-11-03 03:33:11,343 INFO L226 Difference]: Without dead ends: 32 [2022-11-03 03:33:11,345 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 [2022-11-03 03:33:11,349 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:11,350 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 14 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:11,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-03 03:33:11,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-03 03:33:11,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 31 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) [2022-11-03 03:33:11,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-11-03 03:33:11,383 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 3 [2022-11-03 03:33:11,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:11,383 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-11-03 03:33:11,384 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) [2022-11-03 03:33:11,384 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-11-03 03:33:11,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-03 03:33:11,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:11,385 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-03 03:33:11,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 03:33:11,385 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)] === [2022-11-03 03:33:11,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:11,386 INFO L85 PathProgramCache]: Analyzing trace with hash 155460, now seen corresponding path program 1 times [2022-11-03 03:33:11,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:11,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937732319] [2022-11-03 03:33:11,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:11,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:11,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:11,722 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:11,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:11,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937732319] [2022-11-03 03:33:11,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937732319] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:11,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:11,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:33:11,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227614023] [2022-11-03 03:33:11,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:11,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:33:11,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:11,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:33:11,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:11,727 INFO L87 Difference]: Start difference. First operand 32 states and 35 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) [2022-11-03 03:33:11,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:11,864 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-11-03 03:33:11,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:33:11,865 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 [2022-11-03 03:33:11,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:11,866 INFO L225 Difference]: With dead ends: 62 [2022-11-03 03:33:11,866 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 03:33:11,866 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 [2022-11-03 03:33:11,868 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:11,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 40 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:11,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 03:33:11,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 34. [2022-11-03 03:33:11,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 17 states have (on average 2.235294117647059) internal successors, (38), 33 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) [2022-11-03 03:33:11,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2022-11-03 03:33:11,882 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 3 [2022-11-03 03:33:11,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:11,883 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2022-11-03 03:33:11,884 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) [2022-11-03 03:33:11,884 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2022-11-03 03:33:11,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 03:33:11,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:11,885 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 03:33:11,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 03:33:11,891 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:11,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:11,893 INFO L85 PathProgramCache]: Analyzing trace with hash 4919712, now seen corresponding path program 1 times [2022-11-03 03:33:11,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:11,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016160805] [2022-11-03 03:33:11,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:11,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:11,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:11,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:11,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:11,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016160805] [2022-11-03 03:33:11,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016160805] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:11,945 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:11,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-03 03:33:11,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015685676] [2022-11-03 03:33:11,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:11,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:33:11,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:11,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:33:11,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:33:11,947 INFO L87 Difference]: Start difference. First operand 34 states and 38 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) [2022-11-03 03:33:11,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:11,986 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-03 03:33:11,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:11,987 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 [2022-11-03 03:33:11,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:11,988 INFO L225 Difference]: With dead ends: 32 [2022-11-03 03:33:11,988 INFO L226 Difference]: Without dead ends: 32 [2022-11-03 03:33:11,988 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 [2022-11-03 03:33:11,990 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:11,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 14 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:11,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-03 03:33:11,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-03 03:33:11,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:11,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2022-11-03 03:33:11,995 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 4 [2022-11-03 03:33:11,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:11,995 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2022-11-03 03:33:11,995 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) [2022-11-03 03:33:11,996 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2022-11-03 03:33:11,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 03:33:11,996 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:11,996 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 03:33:11,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-03 03:33:11,997 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:11,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:11,998 INFO L85 PathProgramCache]: Analyzing trace with hash 4919713, now seen corresponding path program 1 times [2022-11-03 03:33:11,998 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:11,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610995855] [2022-11-03 03:33:11,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:11,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:12,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:12,212 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:12,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:12,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610995855] [2022-11-03 03:33:12,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610995855] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:12,213 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:12,213 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:33:12,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611765774] [2022-11-03 03:33:12,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:12,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:33:12,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:12,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:33:12,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:33:12,216 INFO L87 Difference]: Start difference. First operand 32 states and 36 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) [2022-11-03 03:33:12,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:12,366 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-11-03 03:33:12,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:33:12,366 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 [2022-11-03 03:33:12,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:12,369 INFO L225 Difference]: With dead ends: 57 [2022-11-03 03:33:12,370 INFO L226 Difference]: Without dead ends: 57 [2022-11-03 03:33:12,372 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 [2022-11-03 03:33:12,382 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 58 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:12,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 33 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:12,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-03 03:33:12,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2022-11-03 03:33:12,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:12,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2022-11-03 03:33:12,395 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 4 [2022-11-03 03:33:12,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:12,396 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2022-11-03 03:33:12,396 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) [2022-11-03 03:33:12,396 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2022-11-03 03:33:12,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 03:33:12,397 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:12,397 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 03:33:12,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 03:33:12,398 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:12,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:12,400 INFO L85 PathProgramCache]: Analyzing trace with hash 4922326, now seen corresponding path program 1 times [2022-11-03 03:33:12,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:12,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779090456] [2022-11-03 03:33:12,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:12,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:12,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:12,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:12,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:12,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779090456] [2022-11-03 03:33:12,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779090456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:12,753 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:12,753 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:33:12,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589272745] [2022-11-03 03:33:12,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:12,754 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:33:12,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:12,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:33:12,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:12,755 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:12,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:12,812 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2022-11-03 03:33:12,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:12,812 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-03 03:33:12,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:12,813 INFO L225 Difference]: With dead ends: 33 [2022-11-03 03:33:12,813 INFO L226 Difference]: Without dead ends: 33 [2022-11-03 03:33:12,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:12,815 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:12,815 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 11 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:12,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-03 03:33:12,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-11-03 03:33:12,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 2.0) 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) [2022-11-03 03:33:12,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2022-11-03 03:33:12,819 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 4 [2022-11-03 03:33:12,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:12,820 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2022-11-03 03:33:12,820 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:12,820 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2022-11-03 03:33:12,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 03:33:12,821 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:12,821 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-03 03:33:12,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-03 03:33:12,822 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:12,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:12,822 INFO L85 PathProgramCache]: Analyzing trace with hash 149478523, now seen corresponding path program 1 times [2022-11-03 03:33:12,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:12,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255676852] [2022-11-03 03:33:12,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:12,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:12,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:13,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:13,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:13,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255676852] [2022-11-03 03:33:13,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255676852] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:13,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1609431299] [2022-11-03 03:33:13,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:13,157 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:13,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:13,159 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:13,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 03:33:13,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:13,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:33:13,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:13,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:13,361 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:13,383 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:13,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:13,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:13,788 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:13,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1609431299] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:13,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1505991574] [2022-11-03 03:33:13,812 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-03 03:33:13,812 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:13,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:13,824 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:13,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:13,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:13,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:13,991 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:14,138 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:14,173 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:14,710 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '478#(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|))) (< (+ |ULTIMATE.start_main_~i~0#1| 1) |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet16#1|)) (<= |ULTIMATE.start_main_#t~nondet16#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:14,710 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:14,710 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:14,710 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-03 03:33:14,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727565941] [2022-11-03 03:33:14,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:14,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 03:33:14,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:14,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 03:33:14,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-11-03 03:33:14,714 INFO L87 Difference]: Start difference. First operand 33 states and 38 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) [2022-11-03 03:33:15,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:15,172 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2022-11-03 03:33:15,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 03:33:15,173 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 [2022-11-03 03:33:15,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:15,174 INFO L225 Difference]: With dead ends: 87 [2022-11-03 03:33:15,174 INFO L226 Difference]: Without dead ends: 87 [2022-11-03 03:33:15,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2022-11-03 03:33:15,175 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 170 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:15,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 132 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:33:15,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-03 03:33:15,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 30. [2022-11-03 03:33:15,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 2.0) internal successors, (34), 29 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) [2022-11-03 03:33:15,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-11-03 03:33:15,180 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 5 [2022-11-03 03:33:15,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:15,180 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-11-03 03:33:15,180 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) [2022-11-03 03:33:15,181 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-11-03 03:33:15,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-03 03:33:15,181 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:15,181 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-03 03:33:15,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:15,382 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 03:33:15,382 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:15,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:15,383 INFO L85 PathProgramCache]: Analyzing trace with hash 152592100, now seen corresponding path program 1 times [2022-11-03 03:33:15,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:15,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398413625] [2022-11-03 03:33:15,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:15,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:15,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:15,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:15,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:15,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398413625] [2022-11-03 03:33:15,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398413625] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:15,588 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:15,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:33:15,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944381954] [2022-11-03 03:33:15,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:15,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:33:15,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:15,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:33:15,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:33:15,590 INFO L87 Difference]: Start difference. First operand 30 states and 34 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) [2022-11-03 03:33:15,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:15,634 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2022-11-03 03:33:15,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:15,634 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 [2022-11-03 03:33:15,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:15,635 INFO L225 Difference]: With dead ends: 29 [2022-11-03 03:33:15,635 INFO L226 Difference]: Without dead ends: 29 [2022-11-03 03:33:15,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:33:15,636 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:15,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 11 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:15,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-03 03:33:15,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-03 03:33:15,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.9411764705882353) 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) [2022-11-03 03:33:15,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-11-03 03:33:15,640 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 5 [2022-11-03 03:33:15,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:15,640 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-11-03 03:33:15,640 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) [2022-11-03 03:33:15,640 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-11-03 03:33:15,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:33:15,641 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:15,641 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-11-03 03:33:15,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-03 03:33:15,641 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:15,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:15,642 INFO L85 PathProgramCache]: Analyzing trace with hash 432950287, now seen corresponding path program 1 times [2022-11-03 03:33:15,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:15,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633990561] [2022-11-03 03:33:15,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:15,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:15,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:15,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:15,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:15,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633990561] [2022-11-03 03:33:15,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633990561] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:15,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451972574] [2022-11-03 03:33:15,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:15,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:15,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:15,868 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:15,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 03:33:15,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:15,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:33:15,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:15,963 INFO L356 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-03 03:33:15,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:16,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:16,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:16,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:16,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451972574] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:16,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440046915] [2022-11-03 03:33:16,330 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-03 03:33:16,330 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:16,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:16,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:16,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:16,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:16,363 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:16,437 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:16,495 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:16,539 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:16,564 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:17,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '711#(and (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|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 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_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet18#1|)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_main_#t~nondet18#1| 127) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:17,148 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:17,148 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:17,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-11-03 03:33:17,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770011227] [2022-11-03 03:33:17,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:17,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 03:33:17,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:17,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 03:33:17,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2022-11-03 03:33:17,150 INFO L87 Difference]: Start difference. First operand 29 states and 33 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) [2022-11-03 03:33:17,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:17,545 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2022-11-03 03:33:17,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:33:17,546 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 [2022-11-03 03:33:17,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:17,547 INFO L225 Difference]: With dead ends: 71 [2022-11-03 03:33:17,547 INFO L226 Difference]: Without dead ends: 71 [2022-11-03 03:33:17,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=314, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:33:17,548 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 148 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:17,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 135 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:33:17,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-03 03:33:17,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 26. [2022-11-03 03:33:17,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:17,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-03 03:33:17,551 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2022-11-03 03:33:17,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:17,552 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-03 03:33:17,552 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) [2022-11-03 03:33:17,552 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-03 03:33:17,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:33:17,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:17,552 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:33:17,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:17,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 03:33:17,768 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)] === [2022-11-03 03:33:17,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:17,769 INFO L85 PathProgramCache]: Analyzing trace with hash 435389511, now seen corresponding path program 1 times [2022-11-03 03:33:17,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:17,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144787883] [2022-11-03 03:33:17,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:17,769 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:17,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:17,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:17,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144787883] [2022-11-03 03:33:17,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144787883] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:17,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:17,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:33:17,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97960189] [2022-11-03 03:33:17,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:17,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:33:17,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:17,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:33:17,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:33:17,899 INFO L87 Difference]: Start difference. First operand 26 states and 29 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) [2022-11-03 03:33:17,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:17,971 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-11-03 03:33:17,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:33:17,972 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 [2022-11-03 03:33:17,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:17,973 INFO L225 Difference]: With dead ends: 42 [2022-11-03 03:33:17,973 INFO L226 Difference]: Without dead ends: 42 [2022-11-03 03:33:17,973 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 [2022-11-03 03:33:17,974 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 101 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:17,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 16 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:17,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-03 03:33:17,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 32. [2022-11-03 03:33:17,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 2.0) internal successors, (42), 31 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) [2022-11-03 03:33:17,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-11-03 03:33:17,978 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 6 [2022-11-03 03:33:17,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:17,979 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-11-03 03:33:17,979 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) [2022-11-03 03:33:17,979 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-11-03 03:33:17,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:33:17,979 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:17,980 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:33:17,980 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-03 03:33:17,980 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:17,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:17,981 INFO L85 PathProgramCache]: Analyzing trace with hash 435389510, now seen corresponding path program 1 times [2022-11-03 03:33:17,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:17,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589348853] [2022-11-03 03:33:17,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:17,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:17,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:18,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:18,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589348853] [2022-11-03 03:33:18,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589348853] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:18,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:18,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:33:18,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66377662] [2022-11-03 03:33:18,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:18,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:33:18,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:18,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:33:18,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:18,024 INFO L87 Difference]: Start difference. First operand 32 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) [2022-11-03 03:33:18,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:18,074 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2022-11-03 03:33:18,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:33:18,075 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 [2022-11-03 03:33:18,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:18,075 INFO L225 Difference]: With dead ends: 29 [2022-11-03 03:33:18,075 INFO L226 Difference]: Without dead ends: 29 [2022-11-03 03:33:18,076 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 [2022-11-03 03:33:18,077 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 35 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:18,077 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 10 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:18,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-03 03:33:18,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-03 03:33:18,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.7142857142857142) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:18,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-11-03 03:33:18,086 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 6 [2022-11-03 03:33:18,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:18,087 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-11-03 03:33:18,087 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) [2022-11-03 03:33:18,087 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-11-03 03:33:18,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 03:33:18,087 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:18,088 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:18,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-03 03:33:18,088 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)] === [2022-11-03 03:33:18,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:18,089 INFO L85 PathProgramCache]: Analyzing trace with hash -110814191, now seen corresponding path program 1 times [2022-11-03 03:33:18,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:18,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108371380] [2022-11-03 03:33:18,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:18,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:18,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:18,143 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:18,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:18,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108371380] [2022-11-03 03:33:18,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108371380] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:18,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:18,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:33:18,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723196433] [2022-11-03 03:33:18,145 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:18,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:33:18,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:18,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:33:18,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:33:18,146 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2022-11-03 03:33:18,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:18,178 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2022-11-03 03:33:18,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:18,179 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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 [2022-11-03 03:33:18,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:18,180 INFO L225 Difference]: With dead ends: 27 [2022-11-03 03:33:18,180 INFO L226 Difference]: Without dead ends: 27 [2022-11-03 03:33:18,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:33:18,182 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:18,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 12 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:18,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-03 03:33:18,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-03 03:33:18,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 26 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) [2022-11-03 03:33:18,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-11-03 03:33:18,185 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 9 [2022-11-03 03:33:18,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:18,186 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-11-03 03:33:18,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 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) [2022-11-03 03:33:18,186 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-11-03 03:33:18,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 03:33:18,187 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:18,187 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:18,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-03 03:33:18,188 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)] === [2022-11-03 03:33:18,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:18,188 INFO L85 PathProgramCache]: Analyzing trace with hash -110814190, now seen corresponding path program 1 times [2022-11-03 03:33:18,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:18,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106808656] [2022-11-03 03:33:18,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:18,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:18,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:18,318 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:18,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:18,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106808656] [2022-11-03 03:33:18,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106808656] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:18,319 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:18,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:33:18,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960448643] [2022-11-03 03:33:18,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:18,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:33:18,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:18,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:33:18,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:18,321 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2022-11-03 03:33:18,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:18,383 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-11-03 03:33:18,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:33:18,384 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 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 [2022-11-03 03:33:18,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:18,384 INFO L225 Difference]: With dead ends: 30 [2022-11-03 03:33:18,385 INFO L226 Difference]: Without dead ends: 30 [2022-11-03 03:33:18,385 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 [2022-11-03 03:33:18,386 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 35 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:18,386 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 10 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:18,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-03 03:33:18,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-03 03:33:18,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5) internal successors, (33), 27 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) [2022-11-03 03:33:18,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-03 03:33:18,389 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 9 [2022-11-03 03:33:18,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:18,389 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-03 03:33:18,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2022-11-03 03:33:18,390 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-03 03:33:18,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 03:33:18,396 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:18,396 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:18,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-03 03:33:18,397 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:18,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:18,397 INFO L85 PathProgramCache]: Analyzing trace with hash -110805117, now seen corresponding path program 1 times [2022-11-03 03:33:18,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:18,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136938818] [2022-11-03 03:33:18,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:18,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:18,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:18,420 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:18,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136938818] [2022-11-03 03:33:18,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136938818] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:18,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:18,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:33:18,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201461138] [2022-11-03 03:33:18,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:18,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:33:18,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:18,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:33:18,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:33:18,423 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2022-11-03 03:33:18,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:18,446 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2022-11-03 03:33:18,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:33:18,447 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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 [2022-11-03 03:33:18,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:18,448 INFO L225 Difference]: With dead ends: 30 [2022-11-03 03:33:18,448 INFO L226 Difference]: Without dead ends: 30 [2022-11-03 03:33:18,448 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 [2022-11-03 03:33:18,449 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 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 [2022-11-03 03:33:18,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:18,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-03 03:33:18,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-11-03 03:33:18,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 29 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) [2022-11-03 03:33:18,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2022-11-03 03:33:18,452 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 9 [2022-11-03 03:33:18,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:18,452 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2022-11-03 03:33:18,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 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) [2022-11-03 03:33:18,453 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2022-11-03 03:33:18,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 03:33:18,453 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:18,453 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:18,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-03 03:33:18,454 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:18,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:18,454 INFO L85 PathProgramCache]: Analyzing trace with hash 881788809, now seen corresponding path program 1 times [2022-11-03 03:33:18,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:18,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65731513] [2022-11-03 03:33:18,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:18,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:18,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:18,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:18,700 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:18,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65731513] [2022-11-03 03:33:18,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65731513] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:18,700 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:18,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 03:33:18,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569922975] [2022-11-03 03:33:18,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:18,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:33:18,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:18,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:33:18,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:33:18,702 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:18,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:18,884 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2022-11-03 03:33:18,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:33:18,885 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 03:33:18,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:18,885 INFO L225 Difference]: With dead ends: 43 [2022-11-03 03:33:18,885 INFO L226 Difference]: Without dead ends: 43 [2022-11-03 03:33:18,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:33:18,886 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 30 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:18,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 56 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:18,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-03 03:33:18,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 37. [2022-11-03 03:33:18,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.4193548387096775) 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) [2022-11-03 03:33:18,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-11-03 03:33:18,889 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 11 [2022-11-03 03:33:18,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:18,890 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-11-03 03:33:18,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:18,890 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-11-03 03:33:18,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-03 03:33:18,891 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:18,891 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:18,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-03 03:33:18,891 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:18,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:18,892 INFO L85 PathProgramCache]: Analyzing trace with hash 890460263, now seen corresponding path program 1 times [2022-11-03 03:33:18,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:18,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251964847] [2022-11-03 03:33:18,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:18,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:18,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:19,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:19,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:19,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251964847] [2022-11-03 03:33:19,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251964847] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:19,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:33:19,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:33:19,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129016756] [2022-11-03 03:33:19,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:19,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:33:19,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:19,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:33:19,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:19,040 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:19,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:19,067 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2022-11-03 03:33:19,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:33:19,068 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-03 03:33:19,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:19,068 INFO L225 Difference]: With dead ends: 36 [2022-11-03 03:33:19,069 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 03:33:19,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:33:19,069 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 22 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 [2022-11-03 03:33:19,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 22 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:33:19,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 03:33:19,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-03 03:33:19,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:19,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-03 03:33:19,072 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2022-11-03 03:33:19,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:19,073 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-03 03:33:19,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:19,073 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-03 03:33:19,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 03:33:19,074 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:19,074 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:19,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-03 03:33:19,074 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:19,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:19,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1012686272, now seen corresponding path program 1 times [2022-11-03 03:33:19,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:19,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1488572702] [2022-11-03 03:33:19,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:19,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:19,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:19,254 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:19,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:19,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1488572702] [2022-11-03 03:33:19,255 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1488572702] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:19,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415620773] [2022-11-03 03:33:19,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:19,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:19,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:19,257 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:19,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 03:33:19,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:19,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:33:19,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:19,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:19,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:19,545 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:19,570 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:33:19,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415620773] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:19,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [143143874] [2022-11-03 03:33:19,575 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:33:19,576 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:19,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:19,576 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:19,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:19,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:19,629 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:19,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:19,727 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:19,758 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:19,807 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:19,808 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:20,008 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:22,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [143143874] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:33:22,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:22,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [6, 6, 6] total 25 [2022-11-03 03:33:22,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215774459] [2022-11-03 03:33:22,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:33:22,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:33:22,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:22,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:33:22,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=548, Unknown=0, NotChecked=0, Total=702 [2022-11-03 03:33:22,167 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2022-11-03 03:33:22,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:22,351 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2022-11-03 03:33:22,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:33:22,352 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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 [2022-11-03 03:33:22,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:22,352 INFO L225 Difference]: With dead ends: 35 [2022-11-03 03:33:22,352 INFO L226 Difference]: Without dead ends: 28 [2022-11-03 03:33:22,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=154, Invalid=548, Unknown=0, NotChecked=0, Total=702 [2022-11-03 03:33:22,354 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 31 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:22,357 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 40 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:33:22,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-03 03:33:22,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-11-03 03:33:22,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:22,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-11-03 03:33:22,369 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 13 [2022-11-03 03:33:22,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:22,370 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-11-03 03:33:22,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2022-11-03 03:33:22,370 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-11-03 03:33:22,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 03:33:22,371 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:22,371 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:22,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:22,586 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 03:33:22,586 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)] === [2022-11-03 03:33:22,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:22,587 INFO L85 PathProgramCache]: Analyzing trace with hash -496469550, now seen corresponding path program 1 times [2022-11-03 03:33:22,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:22,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297972315] [2022-11-03 03:33:22,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:22,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:22,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:22,796 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:22,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:22,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297972315] [2022-11-03 03:33:22,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297972315] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:22,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687065782] [2022-11-03 03:33:22,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:22,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:22,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:22,800 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:22,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 03:33:22,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:22,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:33:22,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:22,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:22,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:23,128 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:23,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:23,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687065782] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:23,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583121162] [2022-11-03 03:33:23,156 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:23,157 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:23,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:23,157 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:23,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:23,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:23,186 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:23,229 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:23,291 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:23,344 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:23,390 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:23,415 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:23,461 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:23,462 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:24,061 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:27,306 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1570#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s2#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s1#1.offset|))) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_cstrcmp_~s2#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (not (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|))) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.offset|) (<= 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_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrcmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s2#1.base|) 1))' at error location [2022-11-03 03:33:27,307 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:27,307 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:27,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2022-11-03 03:33:27,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189573019] [2022-11-03 03:33:27,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:27,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 03:33:27,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:27,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 03:33:27,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=689, Unknown=0, NotChecked=0, Total=812 [2022-11-03 03:33:27,310 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 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) [2022-11-03 03:33:27,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:27,541 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-11-03 03:33:27,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:33:27,542 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 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) Word has length 15 [2022-11-03 03:33:27,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:27,543 INFO L225 Difference]: With dead ends: 36 [2022-11-03 03:33:27,544 INFO L226 Difference]: Without dead ends: 36 [2022-11-03 03:33:27,545 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=180, Invalid=942, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 03:33:27,550 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 192 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:27,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 24 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:27,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-03 03:33:27,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2022-11-03 03:33:27,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:27,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-03 03:33:27,559 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 15 [2022-11-03 03:33:27,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:27,559 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-03 03:33:27,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.3125) internal successors, (37), 16 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) [2022-11-03 03:33:27,560 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-03 03:33:27,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-03 03:33:27,560 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:27,561 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:27,584 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-03 03:33:27,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 03:33:27,764 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)] === [2022-11-03 03:33:27,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:27,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1544500903, now seen corresponding path program 1 times [2022-11-03 03:33:27,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:27,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744448767] [2022-11-03 03:33:27,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:27,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:27,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:28,036 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:28,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:28,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744448767] [2022-11-03 03:33:28,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744448767] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:28,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330624484] [2022-11-03 03:33:28,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:28,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:28,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:28,039 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:28,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 03:33:28,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:28,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 03:33:28,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:28,220 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:28,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:28,318 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:28,343 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:28,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330624484] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:28,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845260224] [2022-11-03 03:33:28,353 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:28,354 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:28,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:28,354 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:28,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:28,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:28,401 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:28,444 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:28,522 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:28,568 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:28,622 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:28,656 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:28,712 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:28,713 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:29,010 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:30,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1771#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:30,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:30,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:30,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2022-11-03 03:33:30,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368920655] [2022-11-03 03:33:30,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:30,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 03:33:30,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:30,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 03:33:30,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2022-11-03 03:33:30,699 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 15 states, 14 states have (on average 3.0) internal successors, (42), 15 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) [2022-11-03 03:33:30,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:30,891 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2022-11-03 03:33:30,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:33:30,892 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 15 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 18 [2022-11-03 03:33:30,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:30,893 INFO L225 Difference]: With dead ends: 36 [2022-11-03 03:33:30,893 INFO L226 Difference]: Without dead ends: 31 [2022-11-03 03:33:30,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=159, Invalid=711, Unknown=0, NotChecked=0, Total=870 [2022-11-03 03:33:30,894 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 116 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:30,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 34 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:30,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-11-03 03:33:30,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2022-11-03 03:33:30,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:30,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-03 03:33:30,897 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 18 [2022-11-03 03:33:30,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:30,897 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-03 03:33:30,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 15 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) [2022-11-03 03:33:30,898 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-03 03:33:30,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 03:33:30,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:30,898 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:30,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:31,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:31,099 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)] === [2022-11-03 03:33:31,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:31,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1793273634, now seen corresponding path program 2 times [2022-11-03 03:33:31,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:31,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855833272] [2022-11-03 03:33:31,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:31,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:31,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:31,697 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:31,698 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:31,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855833272] [2022-11-03 03:33:31,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855833272] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:31,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333065703] [2022-11-03 03:33:31,699 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:33:31,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:31,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:31,701 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:31,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 03:33:31,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:33:31,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:33:31,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 03:33:31,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:31,981 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:32,404 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-03 03:33:32,423 INFO L356 Elim1Store]: treesize reduction 17, result has 43.3 percent of original size [2022-11-03 03:33:32,424 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 47 treesize of output 33 [2022-11-03 03:33:32,450 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:32,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:32,713 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:33:32,714 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 95 [2022-11-03 03:33:32,766 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 34 treesize of output 30 [2022-11-03 03:33:32,784 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:33:32,785 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 51 [2022-11-03 03:33:33,113 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:33,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333065703] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:33,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1116126555] [2022-11-03 03:33:33,115 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:33,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:33,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:33,115 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:33,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:33,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:33,149 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:33,179 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:33,233 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:33,283 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:33,327 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:33,367 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:33,429 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:33,429 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:33,713 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:36,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2002#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:36,048 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:36,048 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:36,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13] total 32 [2022-11-03 03:33:36,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482098461] [2022-11-03 03:33:36,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:36,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-03 03:33:36,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:36,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-03 03:33:36,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1711, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 03:33:36,051 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:36,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:36,965 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2022-11-03 03:33:36,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-03 03:33:36,966 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-03 03:33:36,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:36,966 INFO L225 Difference]: With dead ends: 71 [2022-11-03 03:33:36,966 INFO L226 Difference]: Without dead ends: 35 [2022-11-03 03:33:36,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1090 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=449, Invalid=3711, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 03:33:36,968 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 63 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 181 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:36,969 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 75 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 181 Invalid, 0 Unknown, 61 Unchecked, 0.2s Time] [2022-11-03 03:33:36,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-03 03:33:36,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2022-11-03 03:33:36,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 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) [2022-11-03 03:33:36,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-11-03 03:33:36,971 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 20 [2022-11-03 03:33:36,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:36,971 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-11-03 03:33:36,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7272727272727273) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:36,971 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-11-03 03:33:36,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-03 03:33:36,971 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:36,972 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:37,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:37,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:37,172 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:37,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:37,173 INFO L85 PathProgramCache]: Analyzing trace with hash -1827025419, now seen corresponding path program 3 times [2022-11-03 03:33:37,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:37,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389926074] [2022-11-03 03:33:37,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:37,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:37,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:37,415 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:37,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:37,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389926074] [2022-11-03 03:33:37,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389926074] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:37,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636105912] [2022-11-03 03:33:37,416 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:33:37,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:37,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:37,420 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:37,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 03:33:37,537 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:33:37,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:33:37,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:33:37,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:37,659 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:37,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:37,804 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:37,850 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:37,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636105912] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:37,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829675079] [2022-11-03 03:33:37,852 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:37,852 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:37,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:37,852 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:37,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:37,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:37,879 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:37,911 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:37,950 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:37,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:38,051 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 03:33:38,052 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 84 treesize of output 83 [2022-11-03 03:33:38,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:38,126 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:38,163 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:38,164 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:38,630 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:41,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2317#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s2#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s1#1.offset|))) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_cstrcmp_~s2#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (not (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|))) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.offset|) (<= 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_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrcmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s2#1.base|) 1))' at error location [2022-11-03 03:33:41,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:41,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:41,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 18 [2022-11-03 03:33:41,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019907890] [2022-11-03 03:33:41,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:41,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 03:33:41,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:41,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 03:33:41,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2022-11-03 03:33:41,662 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 19 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:41,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:41,947 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2022-11-03 03:33:41,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 03:33:41,948 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 19 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-03 03:33:41,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:41,949 INFO L225 Difference]: With dead ends: 44 [2022-11-03 03:33:41,949 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 03:33:41,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=212, Invalid=1194, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 03:33:41,950 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 215 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:41,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 44 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:33:41,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 03:33:41,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2022-11-03 03:33:41,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 32 states have (on average 1.15625) internal successors, (37), 34 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) [2022-11-03 03:33:41,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-03 03:33:41,952 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 24 [2022-11-03 03:33:41,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:41,952 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-03 03:33:41,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 19 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:41,952 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-03 03:33:41,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-11-03 03:33:41,953 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:41,953 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:41,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:42,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:42,154 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)] === [2022-11-03 03:33:42,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:42,154 INFO L85 PathProgramCache]: Analyzing trace with hash 1207782308, now seen corresponding path program 2 times [2022-11-03 03:33:42,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:42,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588612257] [2022-11-03 03:33:42,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:42,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:42,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:42,478 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:42,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:42,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588612257] [2022-11-03 03:33:42,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588612257] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:42,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611728344] [2022-11-03 03:33:42,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:33:42,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:42,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:42,480 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:42,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:33:42,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:33:42,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:33:42,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:33:42,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:42,677 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 03:33:42,678 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:42,806 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:42,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:43,014 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:43,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611728344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:43,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33983974] [2022-11-03 03:33:43,016 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:43,016 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:43,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:43,016 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:43,017 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:43,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:43,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:43,089 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:43,139 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:43,178 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:43,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:43,252 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:43,298 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:43,298 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:43,593 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:45,538 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2599#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:45,538 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:45,538 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:45,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 22 [2022-11-03 03:33:45,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009720284] [2022-11-03 03:33:45,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:45,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 03:33:45,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:45,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 03:33:45,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=969, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 03:33:45,541 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 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) [2022-11-03 03:33:45,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:45,792 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2022-11-03 03:33:45,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 03:33:45,792 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 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 27 [2022-11-03 03:33:45,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:45,793 INFO L225 Difference]: With dead ends: 42 [2022-11-03 03:33:45,793 INFO L226 Difference]: Without dead ends: 39 [2022-11-03 03:33:45,794 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 466 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=234, Invalid=1248, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 03:33:45,794 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 108 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:45,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 41 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:33:45,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-03 03:33:45,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-11-03 03:33:45,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:45,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-11-03 03:33:45,797 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 27 [2022-11-03 03:33:45,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:45,797 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-11-03 03:33:45,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 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) [2022-11-03 03:33:45,798 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-11-03 03:33:45,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 03:33:45,798 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:45,798 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:45,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-03 03:33:46,011 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:46,012 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:33:46,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:46,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1037671067, now seen corresponding path program 4 times [2022-11-03 03:33:46,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:46,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224620980] [2022-11-03 03:33:46,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:46,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:46,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:46,523 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:46,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:46,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224620980] [2022-11-03 03:33:46,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224620980] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:46,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117809450] [2022-11-03 03:33:46,524 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:33:46,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:46,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:46,525 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:46,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 03:33:46,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:46,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-03 03:33:46,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:46,742 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,142 INFO L356 Elim1Store]: treesize reduction 20, result has 45.9 percent of original size [2022-11-03 03:33:47,143 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 37 [2022-11-03 03:33:47,149 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:47,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:47,465 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:33:47,465 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 95 [2022-11-03 03:33:47,493 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 22 [2022-11-03 03:33:47,507 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:33:47,507 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 39 [2022-11-03 03:33:47,639 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:33:47,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117809450] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:47,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [664072059] [2022-11-03 03:33:47,641 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:47,642 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:47,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:47,642 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:47,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:47,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:47,687 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:47,723 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,770 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,842 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,866 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:47,902 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:47,902 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:48,281 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:51,731 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2899#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s2#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s1#1.offset|))) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_cstrcmp_~s2#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (not (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|))) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.offset|) (<= 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_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrcmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s2#1.base|) 1))' at error location [2022-11-03 03:33:51,731 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:51,732 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:51,732 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14] total 31 [2022-11-03 03:33:51,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844992607] [2022-11-03 03:33:51,732 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:51,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-03 03:33:51,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:51,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-03 03:33:51,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1666, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 03:33:51,734 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 31 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 31 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) [2022-11-03 03:33:52,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:52,779 INFO L93 Difference]: Finished difference Result 97 states and 100 transitions. [2022-11-03 03:33:52,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 03:33:52,779 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 31 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 29 [2022-11-03 03:33:52,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:52,780 INFO L225 Difference]: With dead ends: 97 [2022-11-03 03:33:52,780 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 03:33:52,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=312, Invalid=3720, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 03:33:52,781 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 146 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:52,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 117 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 240 Invalid, 0 Unknown, 146 Unchecked, 0.2s Time] [2022-11-03 03:33:52,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 03:33:52,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-03 03:33:52,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 39 states have (on average 1.1282051282051282) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:52,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-11-03 03:33:52,784 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 29 [2022-11-03 03:33:52,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:52,784 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-11-03 03:33:52,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 31 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) [2022-11-03 03:33:52,784 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-11-03 03:33:52,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-03 03:33:52,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:52,785 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:52,824 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:52,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:52,986 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)] === [2022-11-03 03:33:52,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:52,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1363930588, now seen corresponding path program 5 times [2022-11-03 03:33:52,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:52,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622847542] [2022-11-03 03:33:52,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:52,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:53,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:33:53,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:53,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622847542] [2022-11-03 03:33:53,301 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622847542] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:53,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241171522] [2022-11-03 03:33:53,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:33:53,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:53,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:53,303 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:53,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:33:53,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 03:33:53,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:33:53,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-03 03:33:53,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:53,754 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:33:53,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:53,954 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:54,076 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:33:54,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241171522] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:54,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338632088] [2022-11-03 03:33:54,078 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:54,078 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:54,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:54,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:54,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:54,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:54,115 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:54,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:54,190 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:54,224 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:54,265 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:54,289 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:54,331 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:54,332 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:54,543 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:33:56,358 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3317#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:33:56,359 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:33:56,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:33:56,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 10] total 28 [2022-11-03 03:33:56,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667475591] [2022-11-03 03:33:56,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:33:56,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-03 03:33:56,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:33:56,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-03 03:33:56,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1464, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 03:33:56,361 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 30 states, 29 states have (on average 2.896551724137931) internal successors, (84), 29 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:56,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:33:56,908 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2022-11-03 03:33:56,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 03:33:56,909 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.896551724137931) internal successors, (84), 29 states have internal predecessors, (84), 0 states have call successors, (0), 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 [2022-11-03 03:33:56,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:33:56,909 INFO L225 Difference]: With dead ends: 54 [2022-11-03 03:33:56,909 INFO L226 Difference]: Without dead ends: 54 [2022-11-03 03:33:56,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=329, Invalid=2221, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 03:33:56,911 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 268 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:33:56,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [268 Valid, 74 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:33:56,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-03 03:33:56,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 44. [2022-11-03 03:33:56,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:56,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2022-11-03 03:33:56,913 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 33 [2022-11-03 03:33:56,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:33:56,914 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2022-11-03 03:33:56,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.896551724137931) internal successors, (84), 29 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:33:56,914 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2022-11-03 03:33:56,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 03:33:56,915 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:33:56,915 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-03 03:33:56,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:33:57,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-03 03:33:57,144 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)] === [2022-11-03 03:33:57,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:33:57,144 INFO L85 PathProgramCache]: Analyzing trace with hash 1830937877, now seen corresponding path program 3 times [2022-11-03 03:33:57,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:33:57,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994523049] [2022-11-03 03:33:57,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:33:57,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:33:57,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:33:57,496 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:33:57,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:33:57,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994523049] [2022-11-03 03:33:57,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994523049] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:33:57,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367890795] [2022-11-03 03:33:57,497 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:33:57,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:33:57,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:33:57,498 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:33:57,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:33:57,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:33:57,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:33:57,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:33:57,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:33:57,665 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 03:33:57,666 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:57,812 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:33:57,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:33:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:33:58,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367890795] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:33:58,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1420722675] [2022-11-03 03:33:58,086 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:33:58,086 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:33:58,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:33:58,087 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:33:58,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:33:58,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:33:58,120 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:58,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:58,200 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:58,249 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:58,279 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:58,310 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:33:58,362 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:33:58,362 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:33:58,604 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:00,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3682#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:00,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:00,271 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:00,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2022-11-03 03:34:00,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082436555] [2022-11-03 03:34:00,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:00,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 03:34:00,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:00,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 03:34:00,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:34:00,274 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 26 states, 25 states have (on average 3.16) internal successors, (79), 26 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:00,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:00,548 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2022-11-03 03:34:00,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:34:00,548 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.16) internal successors, (79), 26 states have internal predecessors, (79), 0 states have call successors, (0), 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 36 [2022-11-03 03:34:00,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:00,549 INFO L225 Difference]: With dead ends: 51 [2022-11-03 03:34:00,549 INFO L226 Difference]: Without dead ends: 48 [2022-11-03 03:34:00,550 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 520 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=291, Invalid=1515, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 03:34:00,550 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 114 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:00,551 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 66 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:34:00,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-03 03:34:00,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-11-03 03:34:00,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 46 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) [2022-11-03 03:34:00,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-11-03 03:34:00,553 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 36 [2022-11-03 03:34:00,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:00,554 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-11-03 03:34:00,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.16) internal successors, (79), 26 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:00,554 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-11-03 03:34:00,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 03:34:00,555 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:00,555 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:00,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:00,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 03:34:00,760 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)] === [2022-11-03 03:34:00,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:00,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1405248564, now seen corresponding path program 6 times [2022-11-03 03:34:00,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:00,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100847594] [2022-11-03 03:34:00,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:00,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:00,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:01,335 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:01,335 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:01,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100847594] [2022-11-03 03:34:01,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100847594] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:01,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889474864] [2022-11-03 03:34:01,336 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:34:01,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:01,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:01,337 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:01,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 03:34:01,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:34:01,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:01,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-03 03:34:01,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:01,537 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:01,728 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:01,797 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:01,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:01,976 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_471 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_471) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 03:34:01,996 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:01,996 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable 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 [2022-11-03 03:34:02,010 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:02,010 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:02,224 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:02,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889474864] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:02,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102746232] [2022-11-03 03:34:02,226 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:02,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:02,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:02,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:02,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:02,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:02,275 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:02,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:02,342 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:02,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:02,424 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:02,461 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:02,517 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:02,517 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:02,798 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:05,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4051#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:05,034 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:05,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:05,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2022-11-03 03:34:05,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743388630] [2022-11-03 03:34:05,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:05,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 03:34:05,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:05,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 03:34:05,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1142, Unknown=1, NotChecked=68, Total=1332 [2022-11-03 03:34:05,036 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:05,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:05,435 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-11-03 03:34:05,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 03:34:05,436 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-11-03 03:34:05,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:05,437 INFO L225 Difference]: With dead ends: 76 [2022-11-03 03:34:05,437 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 03:34:05,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 87 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=164, Invalid=1561, Unknown=1, NotChecked=80, Total=1806 [2022-11-03 03:34:05,438 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 21 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:05,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 136 Invalid, 500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 387 Invalid, 0 Unknown, 106 Unchecked, 0.2s Time] [2022-11-03 03:34:05,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 03:34:05,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-11-03 03:34:05,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 46 states have (on average 1.108695652173913) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:05,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-11-03 03:34:05,441 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 38 [2022-11-03 03:34:05,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:05,441 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-11-03 03:34:05,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 25 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:05,442 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-11-03 03:34:05,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-03 03:34:05,442 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:05,443 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:05,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-03 03:34:05,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:05,648 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:05,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:05,648 INFO L85 PathProgramCache]: Analyzing trace with hash 565386037, now seen corresponding path program 7 times [2022-11-03 03:34:05,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:05,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553828402] [2022-11-03 03:34:05,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:05,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:05,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:06,044 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:06,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:06,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553828402] [2022-11-03 03:34:06,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553828402] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:06,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680484749] [2022-11-03 03:34:06,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:34:06,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:06,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:06,046 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:06,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 03:34:06,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:06,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 03:34:06,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:06,383 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:06,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:06,628 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:06,724 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 41 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-03 03:34:06,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680484749] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:06,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [879951446] [2022-11-03 03:34:06,726 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:06,726 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:06,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:06,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:06,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:06,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:06,749 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:06,782 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:06,814 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:06,837 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:06,879 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 85 treesize of output 77 [2022-11-03 03:34:06,932 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:06,963 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:07,005 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:07,006 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:07,236 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:08,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4461#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:08,751 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:08,751 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:08,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 26 [2022-11-03 03:34:08,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164690574] [2022-11-03 03:34:08,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:08,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-03 03:34:08,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:08,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-03 03:34:08,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1318, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 03:34:08,753 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 28 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:09,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:09,160 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2022-11-03 03:34:09,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 03:34:09,160 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 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 40 [2022-11-03 03:34:09,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:09,161 INFO L225 Difference]: With dead ends: 60 [2022-11-03 03:34:09,161 INFO L226 Difference]: Without dead ends: 60 [2022-11-03 03:34:09,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 87 SyntacticMatches, 5 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=315, Invalid=1847, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 03:34:09,162 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 197 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:09,162 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 63 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:34:09,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-03 03:34:09,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 51. [2022-11-03 03:34:09,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:09,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-11-03 03:34:09,164 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 40 [2022-11-03 03:34:09,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:09,165 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-11-03 03:34:09,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:09,165 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-11-03 03:34:09,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 03:34:09,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:09,172 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:09,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:09,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 03:34:09,372 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)] === [2022-11-03 03:34:09,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:09,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1444809116, now seen corresponding path program 4 times [2022-11-03 03:34:09,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:09,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006097348] [2022-11-03 03:34:09,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:09,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:09,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:10,959 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:34:10,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:10,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006097348] [2022-11-03 03:34:10,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006097348] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:10,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797753820] [2022-11-03 03:34:10,960 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:34:10,960 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:10,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:10,961 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:10,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 03:34:11,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:11,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-03 03:34:11,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:11,284 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:11,916 INFO L356 Elim1Store]: treesize reduction 24, result has 35.1 percent of original size [2022-11-03 03:34:11,916 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 33 [2022-11-03 03:34:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:11,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:12,480 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:12,480 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 95 [2022-11-03 03:34:12,494 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 22 [2022-11-03 03:34:12,528 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:12,528 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 39 [2022-11-03 03:34:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:12,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797753820] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:12,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729774169] [2022-11-03 03:34:12,728 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:12,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:12,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:12,729 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:12,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:12,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:12,763 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:12,800 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:12,839 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:12,893 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:12,920 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:12,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:12,975 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:12,976 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:13,267 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:16,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4894#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:16,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:16,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:16,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 16] total 43 [2022-11-03 03:34:16,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776476521] [2022-11-03 03:34:16,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:16,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-03 03:34:16,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:16,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-03 03:34:16,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=2799, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 03:34:16,753 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 43 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) [2022-11-03 03:34:19,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:19,876 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2022-11-03 03:34:19,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-03 03:34:19,877 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 43 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 43 [2022-11-03 03:34:19,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:19,878 INFO L225 Difference]: With dead ends: 138 [2022-11-03 03:34:19,878 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 03:34:19,880 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 90 SyntacticMatches, 6 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 1743 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=412, Invalid=6898, Unknown=0, NotChecked=0, Total=7310 [2022-11-03 03:34:19,880 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 40 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 146 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:19,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 104 Invalid, 839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 650 Invalid, 0 Unknown, 146 Unchecked, 0.5s Time] [2022-11-03 03:34:19,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 03:34:19,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2022-11-03 03:34:19,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 87 states have (on average 1.0919540229885059) internal successors, (95), 89 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:19,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2022-11-03 03:34:19,883 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 43 [2022-11-03 03:34:19,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:19,884 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2022-11-03 03:34:19,884 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.395348837209302) internal successors, (103), 43 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) [2022-11-03 03:34:19,884 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2022-11-03 03:34:19,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 03:34:19,885 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:19,885 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:19,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:20,107 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 03:34:20,108 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:20,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:20,108 INFO L85 PathProgramCache]: Analyzing trace with hash -1236833921, now seen corresponding path program 1 times [2022-11-03 03:34:20,108 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:20,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628482768] [2022-11-03 03:34:20,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:20,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:20,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:20,564 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:20,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:20,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628482768] [2022-11-03 03:34:20,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628482768] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:20,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671410547] [2022-11-03 03:34:20,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:20,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:20,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:20,568 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:20,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 03:34:20,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:20,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 03:34:20,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:20,890 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:20,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:21,074 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:21,147 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:21,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671410547] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:21,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322940376] [2022-11-03 03:34:21,149 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-03 03:34:21,150 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:21,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:21,150 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:21,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:21,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:21,185 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:21,210 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:21,244 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:21,269 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:21,320 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 03:34:21,321 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 84 treesize of output 83 [2022-11-03 03:34:21,372 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:21,390 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:21,430 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:21,431 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:21,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:24,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5496#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrcmp_~uc1~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:24,536 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:24,536 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:24,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 25 [2022-11-03 03:34:24,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124839561] [2022-11-03 03:34:24,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:24,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 03:34:24,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:24,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 03:34:24,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1230, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 03:34:24,538 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand has 26 states, 25 states have (on average 3.44) internal successors, (86), 26 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:24,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:24,900 INFO L93 Difference]: Finished difference Result 97 states and 102 transitions. [2022-11-03 03:34:24,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-03 03:34:24,901 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.44) internal successors, (86), 26 states have internal predecessors, (86), 0 states have call successors, (0), 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 46 [2022-11-03 03:34:24,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:24,901 INFO L225 Difference]: With dead ends: 97 [2022-11-03 03:34:24,901 INFO L226 Difference]: Without dead ends: 94 [2022-11-03 03:34:24,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 106 SyntacticMatches, 5 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=295, Invalid=1685, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 03:34:24,903 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 239 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 366 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:24,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 81 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 366 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:34:24,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-03 03:34:24,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 56. [2022-11-03 03:34:24,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 55 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:24,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2022-11-03 03:34:24,905 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 46 [2022-11-03 03:34:24,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:24,905 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2022-11-03 03:34:24,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.44) internal successors, (86), 26 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:24,906 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2022-11-03 03:34:24,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-03 03:34:24,906 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:24,906 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:24,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:25,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:25,116 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)] === [2022-11-03 03:34:25,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:25,116 INFO L85 PathProgramCache]: Analyzing trace with hash 304183725, now seen corresponding path program 8 times [2022-11-03 03:34:25,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:25,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503164799] [2022-11-03 03:34:25,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:25,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:25,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:25,906 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:25,906 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:25,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503164799] [2022-11-03 03:34:25,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503164799] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:25,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797371694] [2022-11-03 03:34:25,906 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:34:25,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:25,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:25,920 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:25,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 03:34:26,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:34:26,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:26,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-03 03:34:26,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:26,187 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:26,453 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:26,482 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 14 treesize of output 16 [2022-11-03 03:34:26,645 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 17 proven. 69 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 03:34:26,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:26,705 WARN L833 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_669 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_669) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 4 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2022-11-03 03:34:26,710 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:26,710 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable 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 [2022-11-03 03:34:26,716 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:26,716 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:26,720 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 17 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:26,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797371694] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:26,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804889503] [2022-11-03 03:34:26,989 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:26,989 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:26,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:26,990 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:26,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:27,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:27,014 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:27,051 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:27,079 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:27,106 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:27,141 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 85 treesize of output 77 [2022-11-03 03:34:27,199 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:27,232 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:27,276 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:27,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:27,436 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:29,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5984#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:29,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:29,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:29,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18, 15] total 32 [2022-11-03 03:34:29,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552350744] [2022-11-03 03:34:29,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:29,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-03 03:34:29,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:29,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-03 03:34:29,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1662, Unknown=1, NotChecked=82, Total=1892 [2022-11-03 03:34:29,055 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 33 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 32 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:29,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:29,739 INFO L93 Difference]: Finished difference Result 92 states and 95 transitions. [2022-11-03 03:34:29,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 03:34:29,740 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 32 states have internal predecessors, (87), 0 states have call successors, (0), 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 [2022-11-03 03:34:29,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:29,741 INFO L225 Difference]: With dead ends: 92 [2022-11-03 03:34:29,741 INFO L226 Difference]: Without dead ends: 59 [2022-11-03 03:34:29,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 557 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=210, Invalid=2445, Unknown=1, NotChecked=100, Total=2756 [2022-11-03 03:34:29,742 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 19 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:29,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 177 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 841 Invalid, 0 Unknown, 46 Unchecked, 0.4s Time] [2022-11-03 03:34:29,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-03 03:34:29,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2022-11-03 03:34:29,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 57 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:29,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2022-11-03 03:34:29,752 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 47 [2022-11-03 03:34:29,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:29,752 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2022-11-03 03:34:29,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 32 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:29,753 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2022-11-03 03:34:29,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-03 03:34:29,754 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:29,754 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:29,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:29,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-03 03:34:29,976 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:29,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:29,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1853210524, now seen corresponding path program 9 times [2022-11-03 03:34:29,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:29,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73852151] [2022-11-03 03:34:29,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:29,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:29,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:30,410 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 9 proven. 71 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-03 03:34:30,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:30,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73852151] [2022-11-03 03:34:30,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73852151] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:30,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473456725] [2022-11-03 03:34:30,411 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:34:30,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:30,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:30,416 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:30,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 03:34:30,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:34:30,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:30,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-03 03:34:30,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:30,767 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:31,389 INFO L356 Elim1Store]: treesize reduction 20, result has 45.9 percent of original size [2022-11-03 03:34:31,390 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 37 [2022-11-03 03:34:31,428 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 5 proven. 66 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:31,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:31,930 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:31,931 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 95 [2022-11-03 03:34:31,953 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 22 [2022-11-03 03:34:31,967 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:31,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 39 [2022-11-03 03:34:32,155 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 5 proven. 66 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:32,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473456725] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:32,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1290831860] [2022-11-03 03:34:32,157 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:32,157 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:32,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:32,157 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:32,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:32,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:32,180 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:32,215 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:32,250 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:32,272 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:32,327 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 85 treesize of output 77 [2022-11-03 03:34:32,378 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:32,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:32,457 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:32,457 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:32,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:35,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6492#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 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~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:35,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:35,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:35,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18, 18] total 41 [2022-11-03 03:34:35,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679852720] [2022-11-03 03:34:35,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:35,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-03 03:34:35,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:35,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-03 03:34:35,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2490, Unknown=0, NotChecked=0, Total=2652 [2022-11-03 03:34:35,247 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 41 states, 41 states have (on average 2.731707317073171) internal successors, (112), 41 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) [2022-11-03 03:34:36,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:36,503 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2022-11-03 03:34:36,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 03:34:36,503 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.731707317073171) internal successors, (112), 41 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 49 [2022-11-03 03:34:36,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:36,504 INFO L225 Difference]: With dead ends: 99 [2022-11-03 03:34:36,504 INFO L226 Difference]: Without dead ends: 72 [2022-11-03 03:34:36,506 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 102 SyntacticMatches, 7 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 5 DeprecatedPredicates, 1468 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=411, Invalid=5595, Unknown=0, NotChecked=0, Total=6006 [2022-11-03 03:34:36,507 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 49 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 888 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 202 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:36,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 171 Invalid, 888 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 662 Invalid, 0 Unknown, 202 Unchecked, 0.3s Time] [2022-11-03 03:34:36,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-03 03:34:36,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2022-11-03 03:34:36,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 61 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) [2022-11-03 03:34:36,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2022-11-03 03:34:36,509 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 49 [2022-11-03 03:34:36,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:36,510 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2022-11-03 03:34:36,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.731707317073171) internal successors, (112), 41 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) [2022-11-03 03:34:36,510 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2022-11-03 03:34:36,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-03 03:34:36,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:36,510 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:36,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:36,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:36,711 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:36,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:36,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1615345539, now seen corresponding path program 5 times [2022-11-03 03:34:36,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:36,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673232095] [2022-11-03 03:34:36,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:36,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:37,229 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 86 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:37,230 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:37,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673232095] [2022-11-03 03:34:37,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673232095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:37,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564645171] [2022-11-03 03:34:37,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:34:37,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:37,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:37,231 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:37,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 03:34:37,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:34:37,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:37,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 33 conjunts are in the unsatisfiable core [2022-11-03 03:34:37,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:37,815 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:37,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:38,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:38,203 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:38,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564645171] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:38,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1877769709] [2022-11-03 03:34:38,205 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:38,205 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:38,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:38,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:38,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:38,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:38,229 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:38,269 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:38,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:38,339 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:38,395 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 03:34:38,395 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 84 treesize of output 83 [2022-11-03 03:34:38,449 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:38,465 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:38,501 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:38,502 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:38,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:41,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7070#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:34:41,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:41,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:41,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 34 [2022-11-03 03:34:41,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141233284] [2022-11-03 03:34:41,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:41,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-03 03:34:41,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:41,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-03 03:34:41,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=1888, Unknown=0, NotChecked=0, Total=2162 [2022-11-03 03:34:41,628 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 35 states, 34 states have (on average 3.588235294117647) internal successors, (122), 35 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:42,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:42,064 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2022-11-03 03:34:42,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 03:34:42,065 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.588235294117647) internal successors, (122), 35 states have internal predecessors, (122), 0 states have call successors, (0), 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 54 [2022-11-03 03:34:42,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:42,067 INFO L225 Difference]: With dead ends: 69 [2022-11-03 03:34:42,067 INFO L226 Difference]: Without dead ends: 66 [2022-11-03 03:34:42,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 122 SyntacticMatches, 6 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1100 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=457, Invalid=2513, Unknown=0, NotChecked=0, Total=2970 [2022-11-03 03:34:42,068 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 279 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:42,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 101 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:34:42,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-11-03 03:34:42,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-11-03 03:34:42,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 62 states have (on average 1.0806451612903225) internal successors, (67), 64 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:42,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-11-03 03:34:42,070 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 54 [2022-11-03 03:34:42,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:42,071 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-11-03 03:34:42,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.588235294117647) internal successors, (122), 35 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:42,071 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-11-03 03:34:42,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-03 03:34:42,072 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:42,072 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:42,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:42,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:42,276 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:42,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:42,276 INFO L85 PathProgramCache]: Analyzing trace with hash 1863912122, now seen corresponding path program 10 times [2022-11-03 03:34:42,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:42,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420829379] [2022-11-03 03:34:42,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:42,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:42,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:43,040 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 85 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:43,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:43,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420829379] [2022-11-03 03:34:43,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420829379] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:43,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214933353] [2022-11-03 03:34:43,041 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:34:43,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:43,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:43,044 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:43,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 03:34:43,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:43,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 03:34:43,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:43,409 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:44,144 INFO L356 Elim1Store]: treesize reduction 24, result has 35.1 percent of original size [2022-11-03 03:34:44,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 48 treesize of output 33 [2022-11-03 03:34:44,149 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 6 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:44,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:44,857 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:44,857 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 95 treesize of output 95 [2022-11-03 03:34:44,886 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 26 treesize of output 22 [2022-11-03 03:34:44,920 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-03 03:34:44,921 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 39 [2022-11-03 03:34:45,113 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 6 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-03 03:34:45,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214933353] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:45,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1394100137] [2022-11-03 03:34:45,115 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:45,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:45,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:45,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:45,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:45,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:45,142 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:45,176 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:45,205 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:45,224 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:45,274 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 03:34:45,274 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 84 treesize of output 83 [2022-11-03 03:34:45,314 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:45,330 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:45,364 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:45,364 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:45,659 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:49,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7608#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s2#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s1#1.offset|))) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_cstrcmp_~s2#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (not (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|))) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.offset|) (<= 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_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrcmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s2#1.base|) 1))' at error location [2022-11-03 03:34:49,509 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:49,509 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:49,509 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20, 20] total 46 [2022-11-03 03:34:49,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385204074] [2022-11-03 03:34:49,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:49,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-03 03:34:49,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:49,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-03 03:34:49,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3130, Unknown=0, NotChecked=0, Total=3306 [2022-11-03 03:34:49,511 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 46 states, 46 states have (on average 2.782608695652174) internal successors, (128), 46 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) [2022-11-03 03:34:51,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:51,599 INFO L93 Difference]: Finished difference Result 175 states and 178 transitions. [2022-11-03 03:34:51,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-03 03:34:51,599 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.782608695652174) internal successors, (128), 46 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 56 [2022-11-03 03:34:51,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:51,600 INFO L225 Difference]: With dead ends: 175 [2022-11-03 03:34:51,600 INFO L226 Difference]: Without dead ends: 71 [2022-11-03 03:34:51,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 125 SyntacticMatches, 8 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 6 DeprecatedPredicates, 1906 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=423, Invalid=7767, Unknown=0, NotChecked=0, Total=8190 [2022-11-03 03:34:51,601 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 34 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 708 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 1026 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 284 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:51,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 250 Invalid, 1026 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 708 Invalid, 0 Unknown, 284 Unchecked, 0.4s Time] [2022-11-03 03:34:51,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-03 03:34:51,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2022-11-03 03:34:51,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 68 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) [2022-11-03 03:34:51,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-11-03 03:34:51,604 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 56 [2022-11-03 03:34:51,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:51,605 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-11-03 03:34:51,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.782608695652174) internal successors, (128), 46 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) [2022-11-03 03:34:51,605 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-11-03 03:34:51,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-03 03:34:51,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:51,605 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:51,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:51,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:51,806 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:51,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:51,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1334566225, now seen corresponding path program 11 times [2022-11-03 03:34:51,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:51,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466400129] [2022-11-03 03:34:51,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:51,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:51,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:52,332 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 16 proven. 101 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:34:52,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:52,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466400129] [2022-11-03 03:34:52,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466400129] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:52,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250166272] [2022-11-03 03:34:52,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:34:52,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:52,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:52,334 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:52,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 03:34:52,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-03 03:34:52,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:52,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-03 03:34:52,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:53,182 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 25 proven. 92 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:34:53,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:34:53,558 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:53,709 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 25 proven. 92 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:34:53,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250166272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:34:53,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [193318073] [2022-11-03 03:34:53,710 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:34:53,710 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:34:53,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:34:53,711 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:34:53,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:34:53,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:34:53,739 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:53,770 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:53,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:53,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:53,880 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:53,899 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:34:53,929 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:34:53,929 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:54,226 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:34:57,729 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8332#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s2#1.offset|)) (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrcmp_~s1#1.offset|))) (<= 0 |#NULL.base|) (<= |ULTIMATE.start_cstrcmp_~s2#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (not (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|))) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.offset|) (<= 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_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrcmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s2#1.base|) 1))' at error location [2022-11-03 03:34:57,729 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:34:57,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:34:57,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 40 [2022-11-03 03:34:57,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366419070] [2022-11-03 03:34:57,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:34:57,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-03 03:34:57,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:34:57,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-03 03:34:57,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=2538, Unknown=0, NotChecked=0, Total=2862 [2022-11-03 03:34:57,731 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 42 states, 41 states have (on average 3.2439024390243905) internal successors, (133), 41 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:58,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:34:58,202 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2022-11-03 03:34:58,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 03:34:58,202 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 3.2439024390243905) internal successors, (133), 41 states have internal predecessors, (133), 0 states have call successors, (0), 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 60 [2022-11-03 03:34:58,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:34:58,203 INFO L225 Difference]: With dead ends: 80 [2022-11-03 03:34:58,203 INFO L226 Difference]: Without dead ends: 80 [2022-11-03 03:34:58,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 134 SyntacticMatches, 7 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1411 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=600, Invalid=3432, Unknown=0, NotChecked=0, Total=4032 [2022-11-03 03:34:58,204 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 316 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 457 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:34:58,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 69 Invalid, 457 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:34:58,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-03 03:34:58,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2022-11-03 03:34:58,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 68 states have (on average 1.0735294117647058) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:58,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-11-03 03:34:58,207 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 60 [2022-11-03 03:34:58,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:34:58,208 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-11-03 03:34:58,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 3.2439024390243905) internal successors, (133), 41 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:34:58,208 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-11-03 03:34:58,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-11-03 03:34:58,209 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:34:58,209 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1] [2022-11-03 03:34:58,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 03:34:58,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:58,420 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:34:58,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:34:58,420 INFO L85 PathProgramCache]: Analyzing trace with hash -448352568, now seen corresponding path program 6 times [2022-11-03 03:34:58,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:34:58,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877154190] [2022-11-03 03:34:58,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:34:58,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:34:58,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:34:59,001 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 16 proven. 119 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:34:59,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:34:59,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877154190] [2022-11-03 03:34:59,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877154190] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:34:59,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515027953] [2022-11-03 03:34:59,001 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:34:59,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:34:59,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:34:59,002 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:34:59,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 03:34:59,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:34:59,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:34:59,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-03 03:34:59,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:34:59,298 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-03 03:34:59,298 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:34:59,559 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 25 proven. 110 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:34:59,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:35:00,052 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 25 proven. 110 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:35:00,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515027953] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:35:00,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952056901] [2022-11-03 03:35:00,054 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-03 03:35:00,054 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:35:00,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:35:00,054 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:35:00,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:35:00,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-03 03:35:00,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:35:00,105 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:35:00,144 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:35:00,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:35:00,211 INFO L356 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-03 03:35:00,211 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 84 treesize of output 83 [2022-11-03 03:35:00,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:35:00,272 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:35:00,305 INFO L356 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-03 03:35:00,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing 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 [2022-11-03 03:35:00,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:35:03,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8928#(and (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrcmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.offset|) (<= 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_cstrcmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrcmp_~s2#1.base|) (+ |ULTIMATE.start_cstrcmp_~s2#1.offset| 1)) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrcmp_#in~s1#1.base|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= (+ |ULTIMATE.start_cstrcmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcmp_~s1#1.base|)) (= (select |#valid| |ULTIMATE.start_cstrcmp_~s1#1.base|) 1) (= |#NULL.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s1#1.offset| 0) (<= |ULTIMATE.start_cstrcmp_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (= |ULTIMATE.start_cstrcmp_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_cstrcmp_~s1#1.base|) |ULTIMATE.start_cstrcmp_~s1#1.offset|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-03 03:35:03,597 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:35:03,597 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 03:35:03,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 40 [2022-11-03 03:35:03,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575383294] [2022-11-03 03:35:03,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 03:35:03,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-03 03:35:03,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:35:03,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-03 03:35:03,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=2435, Unknown=0, NotChecked=0, Total=2756 [2022-11-03 03:35:03,599 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 41 states, 40 states have (on average 3.175) internal successors, (127), 41 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:35:04,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:35:04,071 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2022-11-03 03:35:04,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 03:35:04,072 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 3.175) internal successors, (127), 41 states have internal predecessors, (127), 0 states have call successors, (0), 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 [2022-11-03 03:35:04,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:35:04,072 INFO L225 Difference]: With dead ends: 78 [2022-11-03 03:35:04,072 INFO L226 Difference]: Without dead ends: 75 [2022-11-03 03:35:04,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=582, Invalid=3200, Unknown=0, NotChecked=0, Total=3782 [2022-11-03 03:35:04,073 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 326 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 532 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:35:04,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 106 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 532 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:35:04,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-03 03:35:04,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2022-11-03 03:35:04,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 73 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:35:04,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2022-11-03 03:35:04,076 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 63 [2022-11-03 03:35:04,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:35:04,077 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2022-11-03 03:35:04,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 3.175) internal successors, (127), 41 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:35:04,077 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2022-11-03 03:35:04,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-03 03:35:04,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:35:04,078 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1] [2022-11-03 03:35:04,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 03:35:04,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-03 03:35:04,288 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-03 03:35:04,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:35:04,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1370045249, now seen corresponding path program 12 times [2022-11-03 03:35:04,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:35:04,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812100378] [2022-11-03 03:35:04,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:35:04,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:35:04,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:35:05,253 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 25 proven. 123 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:35:05,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:35:05,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812100378] [2022-11-03 03:35:05,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812100378] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:35:05,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653876492] [2022-11-03 03:35:05,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:35:05,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:35:05,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:35:05,256 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:35:05,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_65aa1da7-d688-4625-a100-674d6cfc9b4e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 03:35:05,599 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:35:05,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:35:05,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 106 conjunts are in the unsatisfiable core [2022-11-03 03:35:05,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:35:05,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-03 03:36:33,647 INFO L356 Elim1Store]: treesize reduction 201, result has 75.4 percent of original size [2022-11-03 03:36:33,647 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 153 treesize of output 671