./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-pthread/cs_stack-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0f8a17c6 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-pthread/cs_stack-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0a870e8a4a7dff1b238c9b19b47586f7abd44e3f0eb9969b7dad7bbd7f80e506 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-0f8a17c [2021-11-19 14:55:37,898 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-19 14:55:37,900 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-19 14:55:37,940 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-19 14:55:37,941 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-19 14:55:37,943 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-19 14:55:37,945 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-19 14:55:37,948 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-19 14:55:37,951 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-19 14:55:37,953 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-19 14:55:37,954 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-19 14:55:37,956 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-19 14:55:37,957 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-19 14:55:37,959 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-19 14:55:37,961 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-19 14:55:37,963 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-19 14:55:37,965 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-19 14:55:37,966 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-19 14:55:37,970 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-19 14:55:37,973 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-19 14:55:37,976 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-19 14:55:37,978 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-19 14:55:37,980 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-19 14:55:37,981 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-19 14:55:37,986 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-19 14:55:37,987 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-19 14:55:37,988 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-19 14:55:37,989 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-19 14:55:37,990 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-19 14:55:37,992 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-19 14:55:37,992 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-19 14:55:37,994 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-19 14:55:37,995 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-19 14:55:37,996 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-19 14:55:37,998 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-19 14:55:37,999 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-19 14:55:38,000 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-19 14:55:38,001 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-19 14:55:38,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-19 14:55:38,003 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-19 14:55:38,004 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-19 14:55:38,005 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-19 14:55:38,036 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-19 14:55:38,036 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-19 14:55:38,038 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-19 14:55:38,038 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-19 14:55:38,039 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-19 14:55:38,041 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-19 14:55:38,042 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-19 14:55:38,043 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-19 14:55:38,044 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-19 14:55:38,044 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-19 14:55:38,046 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-19 14:55:38,046 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-19 14:55:38,047 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-19 14:55:38,047 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-19 14:55:38,047 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-19 14:55:38,048 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-19 14:55:38,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-19 14:55:38,049 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-19 14:55:38,050 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-19 14:55:38,050 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-19 14:55:38,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-19 14:55:38,051 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-19 14:55:38,051 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-19 14:55:38,052 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-19 14:55:38,052 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-19 14:55:38,053 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-19 14:55:38,053 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-19 14:55:38,053 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-19 14:55:38,054 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-19 14:55:38,056 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-19 14:55:38,056 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-19 14:55:38,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:55:38,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-19 14:55:38,058 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-19 14:55:38,058 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-19 14:55:38,058 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-19 14:55:38,059 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-19 14:55:38,059 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-19 14:55:38,059 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-19 14:55:38,060 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-19 14:55:38,060 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0a870e8a4a7dff1b238c9b19b47586f7abd44e3f0eb9969b7dad7bbd7f80e506 [2021-11-19 14:55:38,380 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-19 14:55:38,412 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-19 14:55:38,416 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-19 14:55:38,418 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-19 14:55:38,419 INFO L275 PluginConnector]: CDTParser initialized [2021-11-19 14:55:38,420 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/../../sv-benchmarks/c/seq-pthread/cs_stack-2.i [2021-11-19 14:55:38,507 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/data/2d940a2f8/0233b52678714464828793afedb80e3a/FLAGd7ed53258 [2021-11-19 14:55:39,243 INFO L306 CDTParser]: Found 1 translation units. [2021-11-19 14:55:39,246 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/sv-benchmarks/c/seq-pthread/cs_stack-2.i [2021-11-19 14:55:39,284 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/data/2d940a2f8/0233b52678714464828793afedb80e3a/FLAGd7ed53258 [2021-11-19 14:55:39,450 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/data/2d940a2f8/0233b52678714464828793afedb80e3a [2021-11-19 14:55:39,456 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-19 14:55:39,460 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-19 14:55:39,466 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-19 14:55:39,467 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-19 14:55:39,471 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-19 14:55:39,472 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:55:39" (1/1) ... [2021-11-19 14:55:39,475 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d897622 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:39, skipping insertion in model container [2021-11-19 14:55:39,475 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 02:55:39" (1/1) ... [2021-11-19 14:55:39,484 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-19 14:55:39,576 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-19 14:55:40,200 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/sv-benchmarks/c/seq-pthread/cs_stack-2.i[34556,34569] [2021-11-19 14:55:40,357 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:55:40,376 INFO L203 MainTranslator]: Completed pre-run [2021-11-19 14:55:40,425 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/sv-benchmarks/c/seq-pthread/cs_stack-2.i[34556,34569] [2021-11-19 14:55:40,494 INFO L207 PostProcessor]: Analyzing one entry point: main [2021-11-19 14:55:40,577 INFO L208 MainTranslator]: Completed translation [2021-11-19 14:55:40,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40 WrapperNode [2021-11-19 14:55:40,578 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-19 14:55:40,579 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-19 14:55:40,579 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-19 14:55:40,580 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-19 14:55:40,589 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,651 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,751 INFO L137 Inliner]: procedures = 252, calls = 270, calls flagged for inlining = 11, calls inlined = 11, statements flattened = 593 [2021-11-19 14:55:40,752 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-19 14:55:40,752 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-19 14:55:40,753 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-19 14:55:40,753 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-19 14:55:40,774 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,775 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,791 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,792 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,847 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,875 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,879 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-19 14:55:40,899 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-19 14:55:40,900 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-19 14:55:40,900 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-19 14:55:40,901 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (1/1) ... [2021-11-19 14:55:40,911 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-19 14:55:40,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:55:40,938 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-19 14:55:40,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-19 14:55:40,991 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-19 14:55:40,991 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-19 14:55:40,991 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-19 14:55:40,992 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_mutex_lock [2021-11-19 14:55:40,992 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_mutex_lock [2021-11-19 14:55:40,992 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-19 14:55:40,992 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-19 14:55:40,992 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-19 14:55:40,993 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_mutex_unlock [2021-11-19 14:55:40,993 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_mutex_unlock [2021-11-19 14:55:40,993 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-19 14:55:40,993 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-19 14:55:40,993 INFO L130 BoogieDeclarations]: Found specification of procedure get_top [2021-11-19 14:55:40,994 INFO L138 BoogieDeclarations]: Found implementation of procedure get_top [2021-11-19 14:55:40,994 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-19 14:55:40,994 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-19 14:55:40,994 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_create [2021-11-19 14:55:40,995 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_create [2021-11-19 14:55:40,995 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_pthread_join [2021-11-19 14:55:40,995 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_pthread_join [2021-11-19 14:55:40,995 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~$Pointer$ [2021-11-19 14:55:40,995 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~$Pointer$ [2021-11-19 14:55:40,996 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-19 14:55:40,996 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-19 14:55:40,996 INFO L130 BoogieDeclarations]: Found specification of procedure __CS_cs [2021-11-19 14:55:40,996 INFO L138 BoogieDeclarations]: Found implementation of procedure __CS_cs [2021-11-19 14:55:40,996 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-19 14:55:40,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-19 14:55:40,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-19 14:55:41,274 INFO L236 CfgBuilder]: Building ICFG [2021-11-19 14:55:41,277 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-19 14:55:41,374 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##4: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,374 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##3: assume 0 != ~__CS_ret~0 % 256;#res := 0; [2021-11-19 14:55:41,397 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930-1: assume 0 != ~__CS_ret~0 % 256; [2021-11-19 14:55:41,398 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930-1: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,398 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##8: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,398 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##9: assume 0 != ~__CS_ret~0 % 256; [2021-11-19 14:55:41,399 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##7: assume 0 != ~__CS_ret~0 % 256; [2021-11-19 14:55:41,399 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##10: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,399 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##4: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,399 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##3: assume 0 != ~__CS_ret~0 % 256; [2021-11-19 14:55:41,399 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L930: SUMMARY for call __CS_cs(); srcloc: null [2021-11-19 14:55:41,887 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##97: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,887 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##96: assume 0 != ~__CS_ret~0 % 256;push_#res#1 := 0; [2021-11-19 14:55:41,887 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##54: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,887 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##53: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-19 14:55:41,888 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##58: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,888 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##57: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-19 14:55:41,888 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##43: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:41,888 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##42: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-19 14:55:41,889 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L1002: assume 0 != ~__CS_ret~0 % 256;pop_#res#1 := 0; [2021-11-19 14:55:41,889 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L1002: assume !(0 != ~__CS_ret~0 % 256);pop_#res#1 := 0; [2021-11-19 14:55:41,889 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint L986-4: SUMMARY for call __CS_cs(); srcloc: null [2021-11-19 14:55:41,889 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##111: assume 0 != ~__CS_ret~0 % 256;push_#res#1 := 0; [2021-11-19 14:55:41,890 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##112: assume !(0 != ~__CS_ret~0 % 256); [2021-11-19 14:55:44,545 INFO L277 CfgBuilder]: Performing block encoding [2021-11-19 14:55:44,696 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-19 14:55:44,696 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-19 14:55:44,700 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:55:44 BoogieIcfgContainer [2021-11-19 14:55:44,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-19 14:55:44,702 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-19 14:55:44,702 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-19 14:55:44,706 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-19 14:55:44,707 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 02:55:39" (1/3) ... [2021-11-19 14:55:44,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@689e32f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:55:44, skipping insertion in model container [2021-11-19 14:55:44,708 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 02:55:40" (2/3) ... [2021-11-19 14:55:44,708 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@689e32f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 02:55:44, skipping insertion in model container [2021-11-19 14:55:44,709 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 02:55:44" (3/3) ... [2021-11-19 14:55:44,710 INFO L111 eAbstractionObserver]: Analyzing ICFG cs_stack-2.i [2021-11-19 14:55:44,717 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-19 14:55:44,718 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-19 14:55:44,798 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-19 14:55:44,807 INFO L339 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-19 14:55:44,807 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-19 14:55:44,857 INFO L276 IsEmpty]: Start isEmpty. Operand has 196 states, 110 states have (on average 1.4454545454545455) internal successors, (159), 113 states have internal predecessors, (159), 75 states have call successors, (75), 9 states have call predecessors, (75), 9 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) [2021-11-19 14:55:44,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-19 14:55:44,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:44,899 INFO L514 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:55:44,899 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:44,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:44,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1915960179, now seen corresponding path program 1 times [2021-11-19 14:55:44,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:55:44,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444900762] [2021-11-19 14:55:44,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:44,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:55:45,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:45,689 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-19 14:55:45,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:55:45,691 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444900762] [2021-11-19 14:55:45,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444900762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:45,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:55:45,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:55:45,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814034959] [2021-11-19 14:55:45,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:45,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:45,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:55:45,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:45,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:55:45,757 INFO L87 Difference]: Start difference. First operand has 196 states, 110 states have (on average 1.4454545454545455) internal successors, (159), 113 states have internal predecessors, (159), 75 states have call successors, (75), 9 states have call predecessors, (75), 9 states have return successors, (75), 75 states have call predecessors, (75), 75 states have call successors, (75) Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-19 14:55:47,795 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:55:48,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:48,265 INFO L93 Difference]: Finished difference Result 383 states and 609 transitions. [2021-11-19 14:55:48,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:55:48,268 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) Word has length 65 [2021-11-19 14:55:48,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:48,304 INFO L225 Difference]: With dead ends: 383 [2021-11-19 14:55:48,307 INFO L226 Difference]: Without dead ends: 344 [2021-11-19 14:55:48,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:55:48,324 INFO L933 BasicCegarLoop]: 361 mSDtfsCounter, 257 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 1004 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:48,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [257 Valid, 1004 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-19 14:55:48,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-11-19 14:55:48,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 340. [2021-11-19 14:55:48,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 192 states have (on average 1.46875) internal successors, (282), 196 states have internal predecessors, (282), 131 states have call successors, (131), 17 states have call predecessors, (131), 16 states have return successors, (135), 128 states have call predecessors, (135), 131 states have call successors, (135) [2021-11-19 14:55:48,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 548 transitions. [2021-11-19 14:55:48,468 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 548 transitions. Word has length 65 [2021-11-19 14:55:48,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:48,468 INFO L470 AbstractCegarLoop]: Abstraction has 340 states and 548 transitions. [2021-11-19 14:55:48,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (14), 1 states have call predecessors, (14), 1 states have return successors, (14), 1 states have call predecessors, (14), 1 states have call successors, (14) [2021-11-19 14:55:48,469 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 548 transitions. [2021-11-19 14:55:48,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-19 14:55:48,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:48,488 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:55:48,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-19 14:55:48,488 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:48,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:48,490 INFO L85 PathProgramCache]: Analyzing trace with hash -69475204, now seen corresponding path program 1 times [2021-11-19 14:55:48,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:55:48,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882847268] [2021-11-19 14:55:48,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:48,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:55:48,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:48,939 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-19 14:55:48,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:55:48,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882847268] [2021-11-19 14:55:48,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882847268] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:48,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:55:48,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:55:48,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463318834] [2021-11-19 14:55:48,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:48,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:48,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:55:48,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:48,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:55:48,952 INFO L87 Difference]: Start difference. First operand 340 states and 548 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:50,988 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:55:51,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:51,492 INFO L93 Difference]: Finished difference Result 672 states and 1086 transitions. [2021-11-19 14:55:51,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:55:51,493 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-19 14:55:51,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:51,504 INFO L225 Difference]: With dead ends: 672 [2021-11-19 14:55:51,504 INFO L226 Difference]: Without dead ends: 637 [2021-11-19 14:55:51,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:55:51,510 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 328 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 44 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:51,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 893 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 112 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-19 14:55:51,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-11-19 14:55:51,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 627. [2021-11-19 14:55:51,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 627 states, 352 states have (on average 1.4744318181818181) internal successors, (519), 363 states have internal predecessors, (519), 243 states have call successors, (243), 30 states have call predecessors, (243), 31 states have return successors, (261), 237 states have call predecessors, (261), 243 states have call successors, (261) [2021-11-19 14:55:51,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 627 states to 627 states and 1023 transitions. [2021-11-19 14:55:51,642 INFO L78 Accepts]: Start accepts. Automaton has 627 states and 1023 transitions. Word has length 123 [2021-11-19 14:55:51,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:51,645 INFO L470 AbstractCegarLoop]: Abstraction has 627 states and 1023 transitions. [2021-11-19 14:55:51,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:51,646 INFO L276 IsEmpty]: Start isEmpty. Operand 627 states and 1023 transitions. [2021-11-19 14:55:51,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-19 14:55:51,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:51,659 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:55:51,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-19 14:55:51,659 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:51,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:51,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1085692156, now seen corresponding path program 1 times [2021-11-19 14:55:51,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:55:51,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253027316] [2021-11-19 14:55:51,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:51,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:55:51,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:51,943 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-19 14:55:51,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:55:51,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253027316] [2021-11-19 14:55:51,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253027316] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:51,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:55:51,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:55:51,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095319400] [2021-11-19 14:55:51,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:51,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:51,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:55:51,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:51,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:55:51,950 INFO L87 Difference]: Start difference. First operand 627 states and 1023 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:53,969 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:55:54,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:54,437 INFO L93 Difference]: Finished difference Result 1245 states and 2015 transitions. [2021-11-19 14:55:54,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:55:54,438 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-19 14:55:54,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:54,448 INFO L225 Difference]: With dead ends: 1245 [2021-11-19 14:55:54,448 INFO L226 Difference]: Without dead ends: 628 [2021-11-19 14:55:54,455 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:55:54,457 INFO L933 BasicCegarLoop]: 354 mSDtfsCounter, 330 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 44 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 893 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:54,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [354 Valid, 893 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 107 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-19 14:55:54,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-11-19 14:55:54,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 622. [2021-11-19 14:55:54,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 622 states, 349 states have (on average 1.4641833810888252) internal successors, (511), 361 states have internal predecessors, (511), 240 states have call successors, (240), 30 states have call predecessors, (240), 32 states have return successors, (254), 234 states have call predecessors, (254), 240 states have call successors, (254) [2021-11-19 14:55:54,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 622 states to 622 states and 1005 transitions. [2021-11-19 14:55:54,534 INFO L78 Accepts]: Start accepts. Automaton has 622 states and 1005 transitions. Word has length 123 [2021-11-19 14:55:54,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:54,535 INFO L470 AbstractCegarLoop]: Abstraction has 622 states and 1005 transitions. [2021-11-19 14:55:54,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:54,535 INFO L276 IsEmpty]: Start isEmpty. Operand 622 states and 1005 transitions. [2021-11-19 14:55:54,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-19 14:55:54,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:54,546 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:55:54,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-19 14:55:54,546 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:54,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:54,547 INFO L85 PathProgramCache]: Analyzing trace with hash 95612746, now seen corresponding path program 1 times [2021-11-19 14:55:54,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:55:54,548 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510421792] [2021-11-19 14:55:54,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:54,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:55:54,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:54,684 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-19 14:55:54,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:55:54,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510421792] [2021-11-19 14:55:54,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510421792] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-19 14:55:54,686 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-19 14:55:54,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-19 14:55:54,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396549667] [2021-11-19 14:55:54,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-19 14:55:54,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-19 14:55:54,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-19 14:55:54,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-19 14:55:54,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-19 14:55:54,689 INFO L87 Difference]: Start difference. First operand 622 states and 1005 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:56,704 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-19 14:55:57,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-19 14:55:57,283 INFO L93 Difference]: Finished difference Result 971 states and 1540 transitions. [2021-11-19 14:55:57,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-19 14:55:57,284 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) Word has length 123 [2021-11-19 14:55:57,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-19 14:55:57,292 INFO L225 Difference]: With dead ends: 971 [2021-11-19 14:55:57,292 INFO L226 Difference]: Without dead ends: 536 [2021-11-19 14:55:57,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-19 14:55:57,298 INFO L933 BasicCegarLoop]: 328 mSDtfsCounter, 378 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 83 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 804 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-19 14:55:57,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 804 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 130 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-19 14:55:57,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-11-19 14:55:57,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 526. [2021-11-19 14:55:57,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 294 states have (on average 1.435374149659864) internal successors, (422), 303 states have internal predecessors, (422), 200 states have call successors, (200), 30 states have call predecessors, (200), 31 states have return successors, (211), 195 states have call predecessors, (211), 200 states have call successors, (211) [2021-11-19 14:55:57,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 833 transitions. [2021-11-19 14:55:57,357 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 833 transitions. Word has length 123 [2021-11-19 14:55:57,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-19 14:55:57,358 INFO L470 AbstractCegarLoop]: Abstraction has 526 states and 833 transitions. [2021-11-19 14:55:57,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 4 states have call successors, (23), 1 states have call predecessors, (23), 2 states have return successors, (23), 3 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-19 14:55:57,358 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 833 transitions. [2021-11-19 14:55:57,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-19 14:55:57,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-19 14:55:57,365 INFO L514 BasicCegarLoop]: trace histogram [19, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-19 14:55:57,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-19 14:55:57,366 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-19 14:55:57,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-19 14:55:57,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1085315085, now seen corresponding path program 1 times [2021-11-19 14:55:57,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-19 14:55:57,367 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696935437] [2021-11-19 14:55:57,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:57,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-19 14:55:58,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:55:59,874 INFO L134 CoverageAnalysis]: Checked inductivity of 384 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 382 trivial. 0 not checked. [2021-11-19 14:55:59,874 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-19 14:55:59,874 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696935437] [2021-11-19 14:55:59,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696935437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-19 14:55:59,874 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35250646] [2021-11-19 14:55:59,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-19 14:55:59,875 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-19 14:55:59,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 [2021-11-19 14:55:59,880 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-19 14:55:59,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d01d0e79-b231-4a9d-8003-a6ebc07ca2f0/bin/utaipan-UbGMyvGFUs/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-19 14:56:00,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-19 14:56:00,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-19 14:56:00,304 INFO L286 TraceCheckSpWp]: Computing forward predicates...