./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/invert_string-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/invert_string-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:07:50,533 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:07:50,535 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:07:50,585 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:07:50,586 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:07:50,590 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:07:50,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:07:50,596 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:07:50,599 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:07:50,606 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:07:50,608 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:07:50,609 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:07:50,610 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:07:50,613 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:07:50,615 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:07:50,620 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:07:50,622 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:07:50,624 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:07:50,626 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:07:50,635 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:07:50,637 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:07:50,639 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:07:50,642 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:07:50,643 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:07:50,652 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:07:50,653 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:07:50,653 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:07:50,656 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:07:50,656 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:07:50,658 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:07:50,659 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:07:50,660 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:07:50,662 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:07:50,663 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:07:50,664 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:07:50,665 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:07:50,665 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:07:50,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:07:50,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:07:50,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:07:50,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:07:50,669 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-02 22:07:50,712 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:07:50,715 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:07:50,716 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:07:50,716 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:07:50,723 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:07:50,724 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:07:50,724 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:07:50,724 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:07:50,725 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:07:50,725 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:07:50,726 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:07:50,726 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:07:50,726 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-02 22:07:50,727 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:07:50,727 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-02 22:07:50,727 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:07:50,727 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-02 22:07:50,727 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:07:50,728 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-02 22:07:50,728 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:07:50,728 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:07:50,728 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:07:50,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:07:50,729 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:07:50,729 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:07:50,729 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-02 22:07:50,730 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:07:50,730 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:07:50,730 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-02 22:07:50,730 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-02 22:07:50,730 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-02 22:07:50,731 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:07:50,731 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3da85103e65fd13a584e838d8b961878044a0a70e09ad1788e3ca53a404f357 [2021-11-02 22:07:51,007 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:07:51,035 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:07:51,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:07:51,038 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:07:51,039 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:07:51,040 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/loops/invert_string-1.c [2021-11-02 22:07:51,099 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/data/461a6e526/749e2d54a7024715aa06093ea3bf2fbb/FLAGccef8df78 [2021-11-02 22:07:51,532 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:07:51,533 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/sv-benchmarks/c/loops/invert_string-1.c [2021-11-02 22:07:51,543 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/data/461a6e526/749e2d54a7024715aa06093ea3bf2fbb/FLAGccef8df78 [2021-11-02 22:07:51,903 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/data/461a6e526/749e2d54a7024715aa06093ea3bf2fbb [2021-11-02 22:07:51,906 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:07:51,907 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-02 22:07:51,925 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:07:51,925 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:07:51,928 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:07:51,929 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:07:51" (1/1) ... [2021-11-02 22:07:51,930 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@531fd286 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:51, skipping insertion in model container [2021-11-02 22:07:51,930 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:07:51" (1/1) ... [2021-11-02 22:07:51,938 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:07:51,951 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:07:52,123 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-11-02 22:07:52,145 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:07:52,151 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:07:52,160 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/sv-benchmarks/c/loops/invert_string-1.c[352,365] [2021-11-02 22:07:52,168 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:07:52,180 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:07:52,181 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52 WrapperNode [2021-11-02 22:07:52,181 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:07:52,182 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-02 22:07:52,182 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-02 22:07:52,182 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-02 22:07:52,190 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,197 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,218 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-02 22:07:52,219 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:07:52,219 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:07:52,219 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:07:52,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,228 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,230 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,230 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,236 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,244 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:07:52,244 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:07:52,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:07:52,245 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:07:52,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (1/1) ... [2021-11-02 22:07:52,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:07:52,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:52,304 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:07:52,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:07:52,355 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:07:52,355 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:07:52,355 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:07:52,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:07:52,356 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:07:52,356 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:07:52,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:07:52,696 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:07:52,697 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-02 22:07:52,699 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:07:52 BoogieIcfgContainer [2021-11-02 22:07:52,699 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:07:52,707 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:07:52,711 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:07:52,715 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:07:52,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:07:51" (1/3) ... [2021-11-02 22:07:52,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@549edb18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:07:52, skipping insertion in model container [2021-11-02 22:07:52,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:07:52" (2/3) ... [2021-11-02 22:07:52,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@549edb18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:07:52, skipping insertion in model container [2021-11-02 22:07:52,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:07:52" (3/3) ... [2021-11-02 22:07:52,718 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2021-11-02 22:07:52,723 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:07:52,724 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-02 22:07:52,800 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:07:52,805 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:07:52,806 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-02 22:07:52,819 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:52,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:07:52,823 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:52,824 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:52,824 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:52,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:52,830 INFO L85 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2021-11-02 22:07:52,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:52,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355575623] [2021-11-02 22:07:52,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:52,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:52,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:52,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:52,989 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:52,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355575623] [2021-11-02 22:07:52,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355575623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:07:52,990 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:07:52,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-02 22:07:52,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548188795] [2021-11-02 22:07:52,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-02 22:07:52,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:53,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-02 22:07:53,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:07:53,015 INFO L87 Difference]: Start difference. First operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:53,031 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2021-11-02 22:07:53,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-02 22:07:53,032 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-02 22:07:53,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:53,040 INFO L225 Difference]: With dead ends: 37 [2021-11-02 22:07:53,041 INFO L226 Difference]: Without dead ends: 16 [2021-11-02 22:07:53,044 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-02 22:07:53,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-02 22:07:53,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-02 22:07:53,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-02 22:07:53,075 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-11-02 22:07:53,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:53,076 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-02 22:07:53,076 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,077 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-02 22:07:53,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:07:53,077 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:53,078 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:53,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:07:53,078 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:53,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:53,079 INFO L85 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2021-11-02 22:07:53,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:53,080 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226298777] [2021-11-02 22:07:53,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:53,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:53,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:53,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:53,165 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:53,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226298777] [2021-11-02 22:07:53,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226298777] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:07:53,166 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:07:53,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:07:53,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215924198] [2021-11-02 22:07:53,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:07:53,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:53,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:07:53,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:07:53,170 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:53,214 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-11-02 22:07:53,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:07:53,215 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-02 22:07:53,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:53,216 INFO L225 Difference]: With dead ends: 34 [2021-11-02 22:07:53,216 INFO L226 Difference]: Without dead ends: 24 [2021-11-02 22:07:53,217 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:07:53,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-02 22:07:53,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2021-11-02 22:07:53,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-02 22:07:53,223 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-11-02 22:07:53,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:53,224 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-02 22:07:53,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,224 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-02 22:07:53,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:07:53,225 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:53,225 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:53,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:07:53,226 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:53,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:53,227 INFO L85 PathProgramCache]: Analyzing trace with hash 1790951096, now seen corresponding path program 1 times [2021-11-02 22:07:53,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:53,227 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506006452] [2021-11-02 22:07:53,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:53,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:53,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:53,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:07:53,328 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:53,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506006452] [2021-11-02 22:07:53,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506006452] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:07:53,329 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:07:53,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:07:53,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625331770] [2021-11-02 22:07:53,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:07:53,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:53,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:07:53,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:07:53,331 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:53,387 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2021-11-02 22:07:53,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:07:53,388 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-02 22:07:53,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:53,389 INFO L225 Difference]: With dead ends: 25 [2021-11-02 22:07:53,389 INFO L226 Difference]: Without dead ends: 18 [2021-11-02 22:07:53,390 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:07:53,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-02 22:07:53,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-02 22:07:53,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-02 22:07:53,399 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2021-11-02 22:07:53,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:53,400 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-02 22:07:53,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:53,400 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-02 22:07:53,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:07:53,401 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:53,402 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:53,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:07:53,403 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:53,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:53,405 INFO L85 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2021-11-02 22:07:53,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:53,405 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160480164] [2021-11-02 22:07:53,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:53,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:53,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:54,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:54,022 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:54,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160480164] [2021-11-02 22:07:54,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160480164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:54,023 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996528374] [2021-11-02 22:07:54,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:54,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:54,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:54,052 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:07:54,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:07:54,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:54,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:07:54,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:07:54,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:07:54,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2021-11-02 22:07:54,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:54,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996528374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:54,732 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:07:54,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2021-11-02 22:07:54,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31334268] [2021-11-02 22:07:54,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:07:54,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:54,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:07:54,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:07:54,740 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:55,175 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-11-02 22:07:55,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:07:55,177 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-02 22:07:55,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:55,181 INFO L225 Difference]: With dead ends: 40 [2021-11-02 22:07:55,182 INFO L226 Difference]: Without dead ends: 38 [2021-11-02 22:07:55,183 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:07:55,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-02 22:07:55,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 27. [2021-11-02 22:07:55,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-11-02 22:07:55,197 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 15 [2021-11-02 22:07:55,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:55,198 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-11-02 22:07:55,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,198 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-11-02 22:07:55,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:07:55,199 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:55,200 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:55,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:07:55,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:55,410 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:55,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:55,411 INFO L85 PathProgramCache]: Analyzing trace with hash 35676596, now seen corresponding path program 2 times [2021-11-02 22:07:55,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:55,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928133019] [2021-11-02 22:07:55,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:55,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:55,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:55,476 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:55,477 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:55,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928133019] [2021-11-02 22:07:55,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928133019] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:55,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620784933] [2021-11-02 22:07:55,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:07:55,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:55,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:55,489 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:07:55,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:07:55,560 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:07:55,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:07:55,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:07:55,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:07:55,619 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:55,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620784933] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:55,620 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:07:55,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-11-02 22:07:55,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975969703] [2021-11-02 22:07:55,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:07:55,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:55,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:07:55,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:07:55,622 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:55,722 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2021-11-02 22:07:55,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:07:55,722 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-02 22:07:55,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:55,724 INFO L225 Difference]: With dead ends: 45 [2021-11-02 22:07:55,724 INFO L226 Difference]: Without dead ends: 38 [2021-11-02 22:07:55,725 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:07:55,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-02 22:07:55,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 29. [2021-11-02 22:07:55,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-02 22:07:55,740 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2021-11-02 22:07:55,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:55,741 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-02 22:07:55,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:55,741 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-02 22:07:55,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:07:55,742 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:55,742 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:55,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:07:55,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:55,943 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:55,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:55,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 3 times [2021-11-02 22:07:55,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:55,944 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850153875] [2021-11-02 22:07:55,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:55,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:55,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:56,305 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:56,306 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:56,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850153875] [2021-11-02 22:07:56,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850153875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:56,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539770050] [2021-11-02 22:07:56,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:07:56,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:56,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:56,310 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:07:56,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:07:56,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:07:56,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:07:56,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-02 22:07:56,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:07:56,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:07:56,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 18 [2021-11-02 22:07:56,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:07:56,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-02 22:07:57,072 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-11-02 22:07:57,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 70 treesize of output 41 [2021-11-02 22:07:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:57,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539770050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:57,101 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:07:57,101 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-11-02 22:07:57,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242173677] [2021-11-02 22:07:57,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:07:57,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:57,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:07:57,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:07:57,107 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:58,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:58,575 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2021-11-02 22:07:58,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 22:07:58,577 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-02 22:07:58,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:58,578 INFO L225 Difference]: With dead ends: 72 [2021-11-02 22:07:58,578 INFO L226 Difference]: Without dead ends: 60 [2021-11-02 22:07:58,579 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=431, Invalid=2019, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:07:58,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-02 22:07:58,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 38. [2021-11-02 22:07:58,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:58,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-11-02 22:07:58,589 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 19 [2021-11-02 22:07:58,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:58,590 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-11-02 22:07:58,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:58,590 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-11-02 22:07:58,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:07:58,592 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:58,592 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:58,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:07:58,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:58,810 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:58,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:58,811 INFO L85 PathProgramCache]: Analyzing trace with hash -138053268, now seen corresponding path program 1 times [2021-11-02 22:07:58,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:58,811 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190643780] [2021-11-02 22:07:58,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:58,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:58,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:58,903 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:07:58,903 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:58,903 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190643780] [2021-11-02 22:07:58,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190643780] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:58,904 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895017421] [2021-11-02 22:07:58,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:58,904 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:58,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:58,909 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:07:58,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:07:59,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:59,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:07:59,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:07:59,115 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:07:59,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895017421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:59,115 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:07:59,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2021-11-02 22:07:59,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701758232] [2021-11-02 22:07:59,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:07:59,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:07:59,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:07:59,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:07:59,118 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:59,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:07:59,202 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-11-02 22:07:59,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:07:59,203 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-02 22:07:59,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:07:59,206 INFO L225 Difference]: With dead ends: 62 [2021-11-02 22:07:59,206 INFO L226 Difference]: Without dead ends: 49 [2021-11-02 22:07:59,207 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:07:59,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-02 22:07:59,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 37. [2021-11-02 22:07:59,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1388888888888888) internal successors, (41), 36 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:59,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-11-02 22:07:59,231 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 19 [2021-11-02 22:07:59,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:07:59,232 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-11-02 22:07:59,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:07:59,234 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-11-02 22:07:59,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:07:59,235 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:07:59,235 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:07:59,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:07:59,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:59,461 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:07:59,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:07:59,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1044113744, now seen corresponding path program 4 times [2021-11-02 22:07:59,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:07:59,462 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435060642] [2021-11-02 22:07:59,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:07:59,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:07:59,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:07:59,578 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:07:59,579 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:07:59,579 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435060642] [2021-11-02 22:07:59,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435060642] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:07:59,579 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579971870] [2021-11-02 22:07:59,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:07:59,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:07:59,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:07:59,585 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:07:59,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:07:59,702 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:07:59,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:07:59,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:07:59,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:07:59,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:07:59,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-02 22:08:00,113 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-02 22:08:00,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 63 treesize of output 36 [2021-11-02 22:08:00,135 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:08:00,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579971870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:08:00,135 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:08:00,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2021-11-02 22:08:00,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779147548] [2021-11-02 22:08:00,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:08:00,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:08:00,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:08:00,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:08:00,138 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:00,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:08:00,863 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2021-11-02 22:08:00,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:08:00,864 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-02 22:08:00,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:08:00,864 INFO L225 Difference]: With dead ends: 73 [2021-11-02 22:08:00,864 INFO L226 Difference]: Without dead ends: 66 [2021-11-02 22:08:00,865 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:08:00,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-02 22:08:00,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 39. [2021-11-02 22:08:00,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:00,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-11-02 22:08:00,890 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2021-11-02 22:08:00,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:08:00,891 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-11-02 22:08:00,891 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:00,891 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-11-02 22:08:00,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:08:00,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:08:00,892 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:08:00,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:08:01,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-02 22:08:01,109 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:08:01,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:08:01,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1020544562, now seen corresponding path program 5 times [2021-11-02 22:08:01,109 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:08:01,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140412422] [2021-11-02 22:08:01,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:08:01,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:08:01,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:08:01,519 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:08:01,519 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:08:01,519 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140412422] [2021-11-02 22:08:01,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140412422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:08:01,520 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691286543] [2021-11-02 22:08:01,520 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:08:01,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:08:01,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:08:01,521 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:08:01,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:08:01,681 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:08:01,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:08:01,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 22:08:01,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:08:01,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:08:02,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-02 22:08:02,234 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-02 22:08:02,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 63 treesize of output 36 [2021-11-02 22:08:02,256 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:08:02,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691286543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:08:02,257 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:08:02,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-11-02 22:08:02,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079274720] [2021-11-02 22:08:02,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:08:02,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:08:02,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:08:02,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:08:02,259 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:03,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:08:03,249 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2021-11-02 22:08:03,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:08:03,250 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-02 22:08:03,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:08:03,251 INFO L225 Difference]: With dead ends: 77 [2021-11-02 22:08:03,251 INFO L226 Difference]: Without dead ends: 75 [2021-11-02 22:08:03,252 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=401, Invalid=1761, Unknown=0, NotChecked=0, Total=2162 [2021-11-02 22:08:03,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-02 22:08:03,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 52. [2021-11-02 22:08:03,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:03,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-11-02 22:08:03,261 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 23 [2021-11-02 22:08:03,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:08:03,262 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-11-02 22:08:03,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-02 22:08:03,262 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-11-02 22:08:03,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:08:03,263 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:08:03,263 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:08:03,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:08:03,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-02 22:08:03,465 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-02 22:08:03,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:08:03,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1262940008, now seen corresponding path program 2 times [2021-11-02 22:08:03,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:08:03,465 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811948524] [2021-11-02 22:08:03,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:08:03,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:08:03,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-02 22:08:03,490 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-02 22:08:03,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-02 22:08:03,528 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-11-02 22:08:03,528 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-11-02 22:08:03,529 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-11-02 22:08:03,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:08:03,539 INFO L731 BasicCegarLoop]: Path program histogram: [5, 2, 1, 1, 1] [2021-11-02 22:08:03,542 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-02 22:08:03,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.11 10:08:03 BoogieIcfgContainer [2021-11-02 22:08:03,592 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-02 22:08:03,593 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-02 22:08:03,594 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-02 22:08:03,594 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-02 22:08:03,594 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:07:52" (3/4) ... [2021-11-02 22:08:03,597 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-02 22:08:03,687 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_da37bb65-c9db-418d-80b0-ed94ac416681/bin/uautomizer-tBqnrhUYjU/witness.graphml [2021-11-02 22:08:03,687 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-02 22:08:03,688 INFO L168 Benchmark]: Toolchain (without parser) took 11780.36 ms. Allocated memory was 132.1 MB in the beginning and 192.9 MB in the end (delta: 60.8 MB). Free memory was 94.3 MB in the beginning and 96.9 MB in the end (delta: -2.6 MB). Peak memory consumption was 57.2 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,689 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 132.1 MB. Free memory was 110.7 MB in the beginning and 110.6 MB in the end (delta: 119.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-02 22:08:03,690 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.49 ms. Allocated memory is still 132.1 MB. Free memory was 94.1 MB in the beginning and 106.5 MB in the end (delta: -12.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,691 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.50 ms. Allocated memory is still 132.1 MB. Free memory was 106.5 MB in the beginning and 104.7 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,692 INFO L168 Benchmark]: Boogie Preprocessor took 24.76 ms. Allocated memory is still 132.1 MB. Free memory was 104.7 MB in the beginning and 103.8 MB in the end (delta: 922.9 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,692 INFO L168 Benchmark]: RCFGBuilder took 455.03 ms. Allocated memory is still 132.1 MB. Free memory was 103.2 MB in the beginning and 92.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,693 INFO L168 Benchmark]: TraceAbstraction took 10884.94 ms. Allocated memory was 132.1 MB in the beginning and 192.9 MB in the end (delta: 60.8 MB). Free memory was 92.1 MB in the beginning and 100.1 MB in the end (delta: -8.0 MB). Peak memory consumption was 55.7 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,693 INFO L168 Benchmark]: Witness Printer took 93.70 ms. Allocated memory is still 192.9 MB. Free memory was 100.1 MB in the beginning and 96.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 22:08:03,696 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 132.1 MB. Free memory was 110.7 MB in the beginning and 110.6 MB in the end (delta: 119.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 256.49 ms. Allocated memory is still 132.1 MB. Free memory was 94.1 MB in the beginning and 106.5 MB in the end (delta: -12.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 36.50 ms. Allocated memory is still 132.1 MB. Free memory was 106.5 MB in the beginning and 104.7 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 24.76 ms. Allocated memory is still 132.1 MB. Free memory was 104.7 MB in the beginning and 103.8 MB in the end (delta: 922.9 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 455.03 ms. Allocated memory is still 132.1 MB. Free memory was 103.2 MB in the beginning and 92.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 10884.94 ms. Allocated memory was 132.1 MB in the beginning and 192.9 MB in the end (delta: 60.8 MB). Free memory was 92.1 MB in the beginning and 100.1 MB in the end (delta: -8.0 MB). Peak memory consumption was 55.7 MB. Max. memory is 16.1 GB. * Witness Printer took 93.70 ms. Allocated memory is still 192.9 MB. Free memory was 100.1 MB in the beginning and 96.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i