./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan --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 44834c55142a76240cb3980fc2bb6f5aeaa27c83 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 09:17:22,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 09:17:22,293 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 09:17:22,324 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 09:17:22,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 09:17:22,326 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 09:17:22,327 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 09:17:22,329 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 09:17:22,330 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 09:17:22,331 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 09:17:22,332 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 09:17:22,333 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 09:17:22,333 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 09:17:22,334 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 09:17:22,335 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 09:17:22,336 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 09:17:22,336 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 09:17:22,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 09:17:22,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 09:17:22,340 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 09:17:22,342 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 09:17:22,343 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 09:17:22,344 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 09:17:22,344 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 09:17:22,347 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 09:17:22,347 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 09:17:22,347 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 09:17:22,348 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 09:17:22,349 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 09:17:22,350 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 09:17:22,350 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 09:17:22,351 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 09:17:22,351 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 09:17:22,352 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 09:17:22,353 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 09:17:22,353 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 09:17:22,354 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 09:17:22,354 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 09:17:22,354 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 09:17:22,355 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 09:17:22,355 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 09:17:22,356 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-09 09:17:22,379 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 09:17:22,380 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 09:17:22,380 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 09:17:22,380 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 09:17:22,381 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 09:17:22,381 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 09:17:22,381 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 09:17:22,381 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 09:17:22,381 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 09:17:22,381 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 09:17:22,382 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 09:17:22,382 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 09:17:22,382 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 09:17:22,382 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 09:17:22,382 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 09:17:22,383 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-09 09:17:22,383 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-09 09:17:22,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 09:17:22,383 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-09 09:17:22,384 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-09 09:17:22,385 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-09 09:17:22,385 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 09:17:22,385 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 09:17:22,385 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 09:17:22,385 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 09:17:22,385 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 09:17:22,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 09:17:22,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 09:17:22,386 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 09:17:22,386 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 09:17:22,386 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 09:17:22,386 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 09:17:22,387 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 09:17:22,387 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 09:17:22,387 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-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 44834c55142a76240cb3980fc2bb6f5aeaa27c83 [2020-12-09 09:17:22,570 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 09:17:22,585 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 09:17:22,587 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 09:17:22,588 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 09:17:22,589 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 09:17:22,589 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/../../sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c [2020-12-09 09:17:22,630 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/data/13d8664d2/5c5958eb5b1a47a3ba82d00d70abba48/FLAGc978f87eb [2020-12-09 09:17:22,995 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 09:17:22,995 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/sv-benchmarks/c/memsafety-ext3/derefAfterFree2.c [2020-12-09 09:17:22,999 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/data/13d8664d2/5c5958eb5b1a47a3ba82d00d70abba48/FLAGc978f87eb [2020-12-09 09:17:23,009 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/data/13d8664d2/5c5958eb5b1a47a3ba82d00d70abba48 [2020-12-09 09:17:23,011 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 09:17:23,012 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 09:17:23,013 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 09:17:23,013 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 09:17:23,015 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 09:17:23,016 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,017 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@788124d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23, skipping insertion in model container [2020-12-09 09:17:23,017 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,022 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 09:17:23,032 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 09:17:23,140 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 09:17:23,148 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 09:17:23,161 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 09:17:23,174 INFO L208 MainTranslator]: Completed translation [2020-12-09 09:17:23,175 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23 WrapperNode [2020-12-09 09:17:23,175 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 09:17:23,176 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 09:17:23,176 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 09:17:23,176 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 09:17:23,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,190 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,206 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 09:17:23,206 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 09:17:23,206 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 09:17:23,207 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 09:17:23,214 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,216 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,220 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,223 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,224 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... [2020-12-09 09:17:23,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 09:17:23,226 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 09:17:23,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 09:17:23,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 09:17:23,227 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 09:17:23,295 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 09:17:23,295 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-09 09:17:23,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 09:17:23,296 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 09:17:23,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 09:17:23,472 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 09:17:23,472 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2020-12-09 09:17:23,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:17:23 BoogieIcfgContainer [2020-12-09 09:17:23,475 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 09:17:23,476 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 09:17:23,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 09:17:23,480 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 09:17:23,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 09:17:23" (1/3) ... [2020-12-09 09:17:23,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c4df958 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 09:17:23, skipping insertion in model container [2020-12-09 09:17:23,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 09:17:23" (2/3) ... [2020-12-09 09:17:23,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c4df958 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 09:17:23, skipping insertion in model container [2020-12-09 09:17:23,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:17:23" (3/3) ... [2020-12-09 09:17:23,483 INFO L111 eAbstractionObserver]: Analyzing ICFG derefAfterFree2.c [2020-12-09 09:17:23,493 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 09:17:23,495 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 6 error locations. [2020-12-09 09:17:23,502 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2020-12-09 09:17:23,516 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 09:17:23,516 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-09 09:17:23,516 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 09:17:23,516 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 09:17:23,516 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 09:17:23,516 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 09:17:23,516 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 09:17:23,517 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 09:17:23,525 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-09 09:17:23,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 09:17:23,529 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:23,530 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 09:17:23,530 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:23,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:23,534 INFO L82 PathProgramCache]: Analyzing trace with hash 64636, now seen corresponding path program 1 times [2020-12-09 09:17:23,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:23,543 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543251998] [2020-12-09 09:17:23,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:23,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:23,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,654 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543251998] [2020-12-09 09:17:23,655 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:17:23,655 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 09:17:23,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940868082] [2020-12-09 09:17:23,658 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 09:17:23,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:23,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 09:17:23,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:17:23,670 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-12-09 09:17:23,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:23,700 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-12-09 09:17:23,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 09:17:23,701 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 09:17:23,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:23,706 INFO L225 Difference]: With dead ends: 22 [2020-12-09 09:17:23,706 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 09:17:23,708 INFO L677 BasicCegarLoop]: 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 [2020-12-09 09:17:23,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 09:17:23,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-12-09 09:17:23,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-09 09:17:23,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-12-09 09:17:23,729 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 3 [2020-12-09 09:17:23,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:23,729 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-12-09 09:17:23,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 09:17:23,729 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-12-09 09:17:23,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 09:17:23,730 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:23,730 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 09:17:23,730 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 09:17:23,730 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:23,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:23,731 INFO L82 PathProgramCache]: Analyzing trace with hash 63748, now seen corresponding path program 1 times [2020-12-09 09:17:23,731 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:23,731 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341885937] [2020-12-09 09:17:23,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:23,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341885937] [2020-12-09 09:17:23,752 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:17:23,752 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 09:17:23,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952341878] [2020-12-09 09:17:23,753 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 09:17:23,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:23,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 09:17:23,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:17:23,755 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 3 states. [2020-12-09 09:17:23,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:23,773 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-12-09 09:17:23,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 09:17:23,774 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 09:17:23,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:23,775 INFO L225 Difference]: With dead ends: 23 [2020-12-09 09:17:23,775 INFO L226 Difference]: Without dead ends: 23 [2020-12-09 09:17:23,776 INFO L677 BasicCegarLoop]: 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 [2020-12-09 09:17:23,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-09 09:17:23,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-12-09 09:17:23,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 09:17:23,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2020-12-09 09:17:23,780 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 3 [2020-12-09 09:17:23,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:23,780 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2020-12-09 09:17:23,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 09:17:23,780 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2020-12-09 09:17:23,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 09:17:23,781 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:23,781 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 09:17:23,781 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 09:17:23,781 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:23,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:23,782 INFO L82 PathProgramCache]: Analyzing trace with hash 63749, now seen corresponding path program 1 times [2020-12-09 09:17:23,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:23,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929065111] [2020-12-09 09:17:23,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:23,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:23,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929065111] [2020-12-09 09:17:23,829 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:17:23,829 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 09:17:23,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302263479] [2020-12-09 09:17:23,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 09:17:23,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:23,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 09:17:23,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:17:23,832 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2020-12-09 09:17:23,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:23,866 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2020-12-09 09:17:23,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 09:17:23,867 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 09:17:23,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:23,867 INFO L225 Difference]: With dead ends: 21 [2020-12-09 09:17:23,867 INFO L226 Difference]: Without dead ends: 21 [2020-12-09 09:17:23,868 INFO L677 BasicCegarLoop]: 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 [2020-12-09 09:17:23,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-12-09 09:17:23,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-12-09 09:17:23,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 09:17:23,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2020-12-09 09:17:23,872 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 3 [2020-12-09 09:17:23,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:23,872 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2020-12-09 09:17:23,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 09:17:23,872 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2020-12-09 09:17:23,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 09:17:23,873 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:23,873 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 09:17:23,873 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 09:17:23,873 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:23,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:23,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1257107777, now seen corresponding path program 1 times [2020-12-09 09:17:23,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:23,875 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956661324] [2020-12-09 09:17:23,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:23,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:23,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956661324] [2020-12-09 09:17:23,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308959178] [2020-12-09 09:17:23,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:23,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:23,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 09:17:23,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:23,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:23,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:23,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489359032] [2020-12-09 09:17:24,014 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 09:17:24,015 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:17:24,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:17:24,025 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:17:24,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:17:24,388 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:17:24,789 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:17:24,789 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:17:24,790 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-09 09:17:24,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759564309] [2020-12-09 09:17:24,790 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 09:17:24,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:24,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 09:17:24,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-12-09 09:17:24,792 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 7 states. [2020-12-09 09:17:24,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:24,825 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-12-09 09:17:24,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 09:17:24,825 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-12-09 09:17:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:24,826 INFO L225 Difference]: With dead ends: 32 [2020-12-09 09:17:24,826 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 09:17:24,826 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-12-09 09:17:24,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 09:17:24,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-12-09 09:17:24,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-09 09:17:24,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-12-09 09:17:24,830 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 7 [2020-12-09 09:17:24,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:24,830 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-12-09 09:17:24,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 09:17:24,830 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-12-09 09:17:24,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 09:17:24,830 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:24,830 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2020-12-09 09:17:25,031 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2020-12-09 09:17:25,032 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:25,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:25,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1257108664, now seen corresponding path program 1 times [2020-12-09 09:17:25,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:25,033 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220093722] [2020-12-09 09:17:25,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:25,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:25,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:25,100 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220093722] [2020-12-09 09:17:25,100 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209228953] [2020-12-09 09:17:25,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:25,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:25,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-09 09:17:25,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:25,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:25,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:25,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902302318] [2020-12-09 09:17:25,174 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 09:17:25,174 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:17:25,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:17:25,175 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:17:25,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:17:25,333 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:17:25,600 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:17:25,601 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:17:25,601 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2020-12-09 09:17:25,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565084641] [2020-12-09 09:17:25,601 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 09:17:25,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:25,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 09:17:25,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2020-12-09 09:17:25,602 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 7 states. [2020-12-09 09:17:25,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:25,669 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2020-12-09 09:17:25,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 09:17:25,670 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-12-09 09:17:25,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:25,671 INFO L225 Difference]: With dead ends: 40 [2020-12-09 09:17:25,671 INFO L226 Difference]: Without dead ends: 40 [2020-12-09 09:17:25,672 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2020-12-09 09:17:25,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-09 09:17:25,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2020-12-09 09:17:25,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-09 09:17:25,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2020-12-09 09:17:25,676 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 7 [2020-12-09 09:17:25,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:25,676 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2020-12-09 09:17:25,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 09:17:25,676 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2020-12-09 09:17:25,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-09 09:17:25,677 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:25,677 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1] [2020-12-09 09:17:25,877 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-09 09:17:25,879 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:25,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:25,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1518770230, now seen corresponding path program 1 times [2020-12-09 09:17:25,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:25,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842909587] [2020-12-09 09:17:25,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:25,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:26,005 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:26,006 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842909587] [2020-12-09 09:17:26,007 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699646923] [2020-12-09 09:17:26,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:26,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:26,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-09 09:17:26,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:26,100 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:26,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:26,125 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:26,126 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1721401338] [2020-12-09 09:17:26,127 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 09:17:26,127 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:17:26,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:17:26,127 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:17:26,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:17:26,321 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:17:26,432 WARN L197 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 60 [2020-12-09 09:17:26,598 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:17:26,598 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 4, 4] total 12 [2020-12-09 09:17:26,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416981716] [2020-12-09 09:17:26,599 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 09:17:26,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:26,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 09:17:26,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-12-09 09:17:26,600 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand 7 states. [2020-12-09 09:17:26,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:26,905 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-12-09 09:17:26,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-09 09:17:26,906 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-12-09 09:17:26,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:26,906 INFO L225 Difference]: With dead ends: 43 [2020-12-09 09:17:26,906 INFO L226 Difference]: Without dead ends: 43 [2020-12-09 09:17:26,907 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-12-09 09:17:26,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-12-09 09:17:26,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2020-12-09 09:17:26,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-09 09:17:26,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-12-09 09:17:26,910 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 13 [2020-12-09 09:17:26,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:26,910 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-12-09 09:17:26,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 09:17:26,910 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-12-09 09:17:26,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-09 09:17:26,910 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:26,911 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1] [2020-12-09 09:17:27,111 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-12-09 09:17:27,112 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:27,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:27,114 INFO L82 PathProgramCache]: Analyzing trace with hash 162763176, now seen corresponding path program 1 times [2020-12-09 09:17:27,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:27,115 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687107431] [2020-12-09 09:17:27,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:27,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:27,146 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:27,146 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687107431] [2020-12-09 09:17:27,147 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637965713] [2020-12-09 09:17:27,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:27,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:27,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-09 09:17:27,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:27,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:27,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:27,203 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:27,203 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1960508590] [2020-12-09 09:17:27,205 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-12-09 09:17:27,205 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:17:27,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:17:27,205 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:17:27,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:17:27,318 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:17:27,642 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:17:27,642 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:17:27,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-12-09 09:17:27,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369008354] [2020-12-09 09:17:27,643 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-09 09:17:27,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:27,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-09 09:17:27,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2020-12-09 09:17:27,644 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2020-12-09 09:17:27,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:27,673 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2020-12-09 09:17:27,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 09:17:27,674 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-12-09 09:17:27,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:27,674 INFO L225 Difference]: With dead ends: 37 [2020-12-09 09:17:27,674 INFO L226 Difference]: Without dead ends: 37 [2020-12-09 09:17:27,675 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2020-12-09 09:17:27,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-09 09:17:27,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-12-09 09:17:27,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-09 09:17:27,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-12-09 09:17:27,677 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 14 [2020-12-09 09:17:27,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:27,677 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-12-09 09:17:27,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-09 09:17:27,678 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-12-09 09:17:27,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-09 09:17:27,678 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:27,678 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1] [2020-12-09 09:17:27,879 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:27,880 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:27,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:27,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1930635537, now seen corresponding path program 2 times [2020-12-09 09:17:27,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:27,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275314053] [2020-12-09 09:17:27,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:27,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:27,982 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:27,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275314053] [2020-12-09 09:17:27,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826015353] [2020-12-09 09:17:27,983 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:28,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-09 09:17:28,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:17:28,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-09 09:17:28,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:28,089 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 09:17:28,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:28,199 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-12-09 09:17:28,199 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-12-09 09:17:28,199 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 4] total 13 [2020-12-09 09:17:28,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204015212] [2020-12-09 09:17:28,200 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-09 09:17:28,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:28,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-09 09:17:28,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-12-09 09:17:28,201 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2020-12-09 09:17:28,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:28,223 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-12-09 09:17:28,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 09:17:28,224 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-12-09 09:17:28,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:28,224 INFO L225 Difference]: With dead ends: 34 [2020-12-09 09:17:28,224 INFO L226 Difference]: Without dead ends: 34 [2020-12-09 09:17:28,224 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2020-12-09 09:17:28,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-09 09:17:28,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-09 09:17:28,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-09 09:17:28,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-12-09 09:17:28,227 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 19 [2020-12-09 09:17:28,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:28,227 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-12-09 09:17:28,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-09 09:17:28,227 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-12-09 09:17:28,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-09 09:17:28,228 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:28,228 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1] [2020-12-09 09:17:28,428 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:28,429 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:28,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:28,430 INFO L82 PathProgramCache]: Analyzing trace with hash -197830453, now seen corresponding path program 2 times [2020-12-09 09:17:28,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:28,431 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365442472] [2020-12-09 09:17:28,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:28,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:28,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365442472] [2020-12-09 09:17:28,577 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39678318] [2020-12-09 09:17:28,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:28,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-09 09:17:28,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 09:17:28,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-09 09:17:28,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 09:17:28,630 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:28,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 09:17:28,679 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 09:17:28,680 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226563652] [2020-12-09 09:17:28,681 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2020-12-09 09:17:28,681 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 09:17:28,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 09:17:28,682 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 09:17:28,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 09:17:28,801 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 09:17:29,169 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 09:17:29,169 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 09:17:29,169 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2020-12-09 09:17:29,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80651203] [2020-12-09 09:17:29,169 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-09 09:17:29,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:29,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-09 09:17:29,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342 [2020-12-09 09:17:29,170 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 13 states. [2020-12-09 09:17:29,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:29,218 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-12-09 09:17:29,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-09 09:17:29,219 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 23 [2020-12-09 09:17:29,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:29,219 INFO L225 Difference]: With dead ends: 49 [2020-12-09 09:17:29,219 INFO L226 Difference]: Without dead ends: 49 [2020-12-09 09:17:29,219 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=243, Unknown=0, NotChecked=0, Total=342 [2020-12-09 09:17:29,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-12-09 09:17:29,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-12-09 09:17:29,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-12-09 09:17:29,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-12-09 09:17:29,222 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 23 [2020-12-09 09:17:29,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:29,223 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-12-09 09:17:29,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-09 09:17:29,223 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-12-09 09:17:29,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-09 09:17:29,223 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:29,223 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1] [2020-12-09 09:17:29,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 09:17:29,425 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:29,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:29,426 INFO L82 PathProgramCache]: Analyzing trace with hash -898363457, now seen corresponding path program 2 times [2020-12-09 09:17:29,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:29,427 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713965738] [2020-12-09 09:17:29,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:29,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 09:17:29,457 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-09 09:17:29,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713965738] [2020-12-09 09:17:29,457 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 09:17:29,457 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 09:17:29,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654616586] [2020-12-09 09:17:29,458 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 09:17:29,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 09:17:29,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 09:17:29,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 09:17:29,458 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 3 states. [2020-12-09 09:17:29,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 09:17:29,462 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2020-12-09 09:17:29,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 09:17:29,462 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-12-09 09:17:29,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 09:17:29,463 INFO L225 Difference]: With dead ends: 48 [2020-12-09 09:17:29,463 INFO L226 Difference]: Without dead ends: 48 [2020-12-09 09:17:29,463 INFO L677 BasicCegarLoop]: 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 [2020-12-09 09:17:29,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-09 09:17:29,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-09 09:17:29,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-09 09:17:29,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-12-09 09:17:29,466 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 26 [2020-12-09 09:17:29,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 09:17:29,466 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-12-09 09:17:29,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 09:17:29,466 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-12-09 09:17:29,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-09 09:17:29,467 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 09:17:29,467 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1] [2020-12-09 09:17:29,467 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2020-12-09 09:17:29,467 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr3ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr2ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_FREE]=== [2020-12-09 09:17:29,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 09:17:29,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1316000454, now seen corresponding path program 1 times [2020-12-09 09:17:29,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 09:17:29,467 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928862122] [2020-12-09 09:17:29,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 09:17:29,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 09:17:29,477 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 09:17:29,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 09:17:29,486 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 09:17:29,497 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 09:17:29,498 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 09:17:29,498 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2020-12-09 09:17:29,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 09:17:29 BoogieIcfgContainer [2020-12-09 09:17:29,515 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 09:17:29,516 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 09:17:29,516 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 09:17:29,516 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 09:17:29,516 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 09:17:23" (3/4) ... [2020-12-09 09:17:29,517 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 09:17:29,543 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_104b66a4-19ef-4c31-8651-2065050baec3/bin/utaipan/witness.graphml [2020-12-09 09:17:29,543 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 09:17:29,544 INFO L168 Benchmark]: Toolchain (without parser) took 6531.82 ms. Allocated memory was 96.5 MB in the beginning and 146.8 MB in the end (delta: 50.3 MB). Free memory was 56.4 MB in the beginning and 63.4 MB in the end (delta: -7.0 MB). Peak memory consumption was 43.7 MB. Max. memory is 16.1 GB. [2020-12-09 09:17:29,544 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 96.5 MB. Free memory was 72.7 MB in the beginning and 72.6 MB in the end (delta: 136.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 09:17:29,544 INFO L168 Benchmark]: CACSL2BoogieTranslator took 162.37 ms. Allocated memory is still 96.5 MB. Free memory was 56.1 MB in the beginning and 73.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. [2020-12-09 09:17:29,544 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.89 ms. Allocated memory is still 96.5 MB. Free memory was 73.6 MB in the beginning and 72.4 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 09:17:29,545 INFO L168 Benchmark]: Boogie Preprocessor took 19.16 ms. Allocated memory is still 96.5 MB. Free memory was 72.4 MB in the beginning and 71.3 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 09:17:29,545 INFO L168 Benchmark]: RCFGBuilder took 248.47 ms. Allocated memory is still 96.5 MB. Free memory was 71.3 MB in the beginning and 67.7 MB in the end (delta: 3.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 09:17:29,545 INFO L168 Benchmark]: TraceAbstraction took 6038.96 ms. Allocated memory was 96.5 MB in the beginning and 146.8 MB in the end (delta: 50.3 MB). Free memory was 67.1 MB in the beginning and 65.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 52.4 MB. Max. memory is 16.1 GB. [2020-12-09 09:17:29,545 INFO L168 Benchmark]: Witness Printer took 27.48 ms. Allocated memory is still 146.8 MB. Free memory was 65.5 MB in the beginning and 63.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 09:17:29,547 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 96.5 MB. Free memory was 72.7 MB in the beginning and 72.6 MB in the end (delta: 136.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 162.37 ms. Allocated memory is still 96.5 MB. Free memory was 56.1 MB in the beginning and 73.6 MB in the end (delta: -17.4 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.89 ms. Allocated memory is still 96.5 MB. Free memory was 73.6 MB in the beginning and 72.4 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.16 ms. Allocated memory is still 96.5 MB. Free memory was 72.4 MB in the beginning and 71.3 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 248.47 ms. Allocated memory is still 96.5 MB. Free memory was 71.3 MB in the beginning and 67.7 MB in the end (delta: 3.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6038.96 ms. Allocated memory was 96.5 MB in the beginning and 146.8 MB in the end (delta: 50.3 MB). Free memory was 67.1 MB in the beginning and 65.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 52.4 MB. Max. memory is 16.1 GB. * Witness Printer took 27.48 ms. Allocated memory is still 146.8 MB. Free memory was 65.5 MB in the beginning and 63.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L6] int* p = malloc(10 * sizeof(int)); [L8] int i = 0; [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND FALSE !(i == 5) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 [L10] COND TRUE i == 5 [L11] free(p) [L11] free(p) [L11] free(p) [L8] i++ [L8] COND TRUE i < 10 [L9] p[i] = 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 6 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.9s, OverallIterations: 11, TraceHistogramMax: 7, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 74 SDtfs, 194 SDslu, 68 SDs, 0 SdLazy, 276 SolverSat, 36 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 252 GetRequests, 164 SyntacticMatches, 6 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 10 MinimizatonAttempts, 21 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 231 NumberOfCodeBlocks, 219 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 262 ConstructedInterpolants, 0 QuantifiedInterpolants, 28992 SizeOfPredicates, 5 NumberOfNonLiveVariables, 272 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 22 InterpolantComputations, 5 PerfectInterpolantSequences, 105/355 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME[ms]: 194, ICFG_INTERPRETER_ENTERED_PROCEDURES: 1, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 6, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 19, TOOLS_POST_TIME[ms]: 113, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME[ms]: 0, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 19, TOOLS_QUANTIFIERELIM_TIME[ms]: 109, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 50, FLUID_QUERY_TIME[ms]: 1, FLUID_QUERIES: 34, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 1, DOMAIN_JOIN_TIME[ms]: 18, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME[ms]: 0, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME[ms]: 48, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME[ms]: 5, DOMAIN_ISBOTTOM_APPLICATIONS: 6, DOMAIN_ISBOTTOM_TIME[ms]: 5, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 136, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 136, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME[ms]: 0, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 0, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 0, PATH_EXPR_TIME[ms]: 0, REGEX_TO_DAG_TIME[ms]: 0, DAG_COMPRESSION_TIME[ms]: 1, DAG_COMPRESSION_PROCESSED_NODES: 49, DAG_COMPRESSION_RETAINED_NODES: 24, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...