./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:07:10,410 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:07:10,412 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:07:10,445 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:07:10,446 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:07:10,447 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:07:10,448 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:07:10,451 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:07:10,453 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:07:10,454 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:07:10,455 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:07:10,457 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:07:10,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:07:10,459 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:07:10,460 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:07:10,462 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:07:10,463 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:07:10,464 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:07:10,466 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:07:10,469 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:07:10,471 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:07:10,473 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:07:10,474 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:07:10,475 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:07:10,479 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:07:10,480 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:07:10,480 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:07:10,481 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:07:10,482 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:07:10,483 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:07:10,484 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:07:10,485 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:07:10,486 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:07:10,486 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:07:10,488 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:07:10,488 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:07:10,489 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:07:10,490 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:07:10,490 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:07:10,491 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:07:10,492 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:07:10,493 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 20:07:10,531 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:07:10,532 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:07:10,533 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:07:10,533 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:07:10,534 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:07:10,534 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:07:10,534 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:07:10,534 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:07:10,535 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:07:10,535 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:07:10,536 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:07:10,536 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:07:10,536 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:07:10,537 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:07:10,537 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:07:10,537 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:07:10,538 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:07:10,538 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:07:10,538 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 20:07:10,538 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 20:07:10,539 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:07:10,539 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:07:10,539 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 20:07:10,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:07:10,541 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:07:10,541 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:07:10,542 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 20:07:10,542 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 20:07:10,542 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 20:07:10,542 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:07:10,542 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 20:07:10,543 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:07:10,543 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:07:10,543 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:07:10,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:07:10,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:07:10,544 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:07:10,544 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:07:10,544 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:07:10,544 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:07:10,544 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:07:10,545 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:07:10,545 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 [2021-11-25 20:07:10,814 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:07:10,840 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:07:10,844 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:07:10,845 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:07:10,846 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:07:10,847 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/memsafety/960521-1-2.i [2021-11-25 20:07:10,916 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/data/b2fc5e992/446de8aac76146639d2c946c54834907/FLAG076dca24c [2021-11-25 20:07:11,422 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:07:11,438 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/sv-benchmarks/c/memsafety/960521-1-2.i [2021-11-25 20:07:11,457 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/data/b2fc5e992/446de8aac76146639d2c946c54834907/FLAG076dca24c [2021-11-25 20:07:11,768 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/data/b2fc5e992/446de8aac76146639d2c946c54834907 [2021-11-25 20:07:11,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:07:11,772 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:07:11,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:07:11,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:07:11,777 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:07:11,777 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:07:11" (1/1) ... [2021-11-25 20:07:11,778 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75759ae1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:11, skipping insertion in model container [2021-11-25 20:07:11,779 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:07:11" (1/1) ... [2021-11-25 20:07:11,788 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:07:11,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:07:12,109 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:07:12,116 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:07:12,150 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:07:12,177 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:07:12,177 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12 WrapperNode [2021-11-25 20:07:12,178 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:07:12,179 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:07:12,179 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:07:12,179 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:07:12,186 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,199 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,218 INFO L137 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 65 [2021-11-25 20:07:12,219 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:07:12,219 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:07:12,220 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:07:12,220 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:07:12,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,227 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,237 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,244 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:07:12,245 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:07:12,245 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:07:12,245 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:07:12,246 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (1/1) ... [2021-11-25 20:07:12,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:07:12,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:12,279 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:07:12,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:07:12,325 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:07:12,327 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:07:12,327 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 20:07:12,327 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:07:12,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:07:12,328 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:07:12,328 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:07:12,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:07:12,480 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:07:12,481 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:07:12,707 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:07:12,751 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:07:12,751 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 20:07:12,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:07:12 BoogieIcfgContainer [2021-11-25 20:07:12,754 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:07:12,756 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:07:12,756 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:07:12,759 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:07:12,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:07:11" (1/3) ... [2021-11-25 20:07:12,760 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516a9048 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:07:12, skipping insertion in model container [2021-11-25 20:07:12,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:07:12" (2/3) ... [2021-11-25 20:07:12,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516a9048 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:07:12, skipping insertion in model container [2021-11-25 20:07:12,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:07:12" (3/3) ... [2021-11-25 20:07:12,763 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1-2.i [2021-11-25 20:07:12,768 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:07:12,768 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-11-25 20:07:12,813 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:07:12,820 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:07:12,821 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-11-25 20:07:12,834 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:12,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-25 20:07:12,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:12,841 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-25 20:07:12,842 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:12,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:12,848 INFO L85 PathProgramCache]: Analyzing trace with hash 3507, now seen corresponding path program 1 times [2021-11-25 20:07:12,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:12,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306372736] [2021-11-25 20:07:12,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:12,859 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:12,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:13,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:13,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306372736] [2021-11-25 20:07:13,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306372736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:13,007 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:13,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 20:07:13,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835134550] [2021-11-25 20:07:13,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:13,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:07:13,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:13,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:07:13,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:13,067 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:13,165 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2021-11-25 20:07:13,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:07:13,167 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2021-11-25 20:07:13,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:13,175 INFO L225 Difference]: With dead ends: 43 [2021-11-25 20:07:13,176 INFO L226 Difference]: Without dead ends: 42 [2021-11-25 20:07:13,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:13,184 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:13,185 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:07:13,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-25 20:07:13,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-11-25 20:07:13,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-11-25 20:07:13,224 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2021-11-25 20:07:13,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:13,225 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-11-25 20:07:13,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,225 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-11-25 20:07:13,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2021-11-25 20:07:13,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:13,226 INFO L514 BasicCegarLoop]: trace histogram [1, 1] [2021-11-25 20:07:13,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:07:13,227 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:13,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:13,231 INFO L85 PathProgramCache]: Analyzing trace with hash 3508, now seen corresponding path program 1 times [2021-11-25 20:07:13,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:13,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858555074] [2021-11-25 20:07:13,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:13,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:13,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:13,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:13,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858555074] [2021-11-25 20:07:13,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858555074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:13,342 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:13,342 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 20:07:13,342 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238777483] [2021-11-25 20:07:13,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:13,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:07:13,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:13,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:07:13,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:13,347 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:13,377 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-25 20:07:13,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:07:13,378 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2021-11-25 20:07:13,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:13,380 INFO L225 Difference]: With dead ends: 41 [2021-11-25 20:07:13,380 INFO L226 Difference]: Without dead ends: 41 [2021-11-25 20:07:13,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:13,386 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:13,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:13,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-25 20:07:13,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-25 20:07:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 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) [2021-11-25 20:07:13,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-11-25 20:07:13,401 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2021-11-25 20:07:13,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:13,401 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-11-25 20:07:13,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,402 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-11-25 20:07:13,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 20:07:13,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:13,408 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 20:07:13,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:07:13,409 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:13,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:13,410 INFO L85 PathProgramCache]: Analyzing trace with hash 3443713, now seen corresponding path program 1 times [2021-11-25 20:07:13,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:13,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176458247] [2021-11-25 20:07:13,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:13,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:13,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,479 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:13,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:13,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176458247] [2021-11-25 20:07:13,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176458247] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:13,480 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:13,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:07:13,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005638391] [2021-11-25 20:07:13,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:13,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:07:13,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:13,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:07:13,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:07:13,483 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:13,520 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-11-25 20:07:13,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:07:13,520 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 20:07:13,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:13,521 INFO L225 Difference]: With dead ends: 38 [2021-11-25 20:07:13,522 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:07:13,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:07:13,523 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:13,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:13,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:07:13,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-11-25 20:07:13,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-11-25 20:07:13,529 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2021-11-25 20:07:13,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:13,529 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-11-25 20:07:13,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,530 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-11-25 20:07:13,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 20:07:13,530 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:13,531 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 20:07:13,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 20:07:13,531 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:13,532 INFO L85 PathProgramCache]: Analyzing trace with hash 3443714, now seen corresponding path program 1 times [2021-11-25 20:07:13,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:13,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624879242] [2021-11-25 20:07:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:13,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:13,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:13,668 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:13,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624879242] [2021-11-25 20:07:13,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624879242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:13,668 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:13,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:07:13,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917766217] [2021-11-25 20:07:13,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:13,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:07:13,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:13,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:07:13,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:07:13,670 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:13,782 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-11-25 20:07:13,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:07:13,783 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 20:07:13,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:13,784 INFO L225 Difference]: With dead ends: 40 [2021-11-25 20:07:13,784 INFO L226 Difference]: Without dead ends: 40 [2021-11-25 20:07:13,784 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:07:13,786 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 1 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:13,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 88 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:07:13,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-25 20:07:13,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-25 20:07:13,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.75) internal successors, (42), 39 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) [2021-11-25 20:07:13,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-11-25 20:07:13,792 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 4 [2021-11-25 20:07:13,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:13,792 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-11-25 20:07:13,792 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:13,793 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-11-25 20:07:13,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:07:13,793 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:13,793 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-25 20:07:13,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:07:13,794 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:13,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:13,794 INFO L85 PathProgramCache]: Analyzing trace with hash -985496187, now seen corresponding path program 1 times [2021-11-25 20:07:13,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:13,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134462103] [2021-11-25 20:07:13,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:13,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:13,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:13,896 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:13,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134462103] [2021-11-25 20:07:13,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134462103] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:13,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273219438] [2021-11-25 20:07:13,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:13,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:13,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:13,911 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:13,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:07:13,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:13,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-25 20:07:13,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:14,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:07:14,129 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 [2021-11-25 20:07:14,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:14,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:14,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:14,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273219438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:14,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848632898] [2021-11-25 20:07:14,345 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 20:07:14,345 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:14,349 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:14,355 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:14,355 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:14,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:14,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 20:07:14,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-25 20:07:14,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,794 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:14,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:14,831 INFO L354 Elim1Store]: treesize reduction 118, result has 12.6 percent of original size [2021-11-25 20:07:14,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 297 [2021-11-25 20:07:14,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:14,957 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:15,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '425#(and (<= 4 ~b~0.offset) (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (< (select |#length| ~a~0.base) (+ ~a~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|) 4)) (<= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:15,155 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:15,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:15,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 8 [2021-11-25 20:07:15,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097036093] [2021-11-25 20:07:15,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:15,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:07:15,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:15,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:07:15,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:07:15,157 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:15,379 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-11-25 20:07:15,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:07:15,383 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 20:07:15,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:15,385 INFO L225 Difference]: With dead ends: 80 [2021-11-25 20:07:15,385 INFO L226 Difference]: Without dead ends: 80 [2021-11-25 20:07:15,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:07:15,386 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 254 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:15,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 91 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:07:15,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-25 20:07:15,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 47. [2021-11-25 20:07:15,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 46 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-11-25 20:07:15,400 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 6 [2021-11-25 20:07:15,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:15,401 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-11-25 20:07:15,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 9 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,401 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-11-25 20:07:15,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:07:15,402 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:15,402 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:15,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:15,617 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:15,617 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:15,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:15,618 INFO L85 PathProgramCache]: Analyzing trace with hash -485540105, now seen corresponding path program 1 times [2021-11-25 20:07:15,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:15,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064883673] [2021-11-25 20:07:15,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:15,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:15,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:15,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:07:15,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:15,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064883673] [2021-11-25 20:07:15,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064883673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:15,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:15,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:07:15,658 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075666995] [2021-11-25 20:07:15,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:15,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:07:15,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:15,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:07:15,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:07:15,660 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:15,712 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-11-25 20:07:15,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:07:15,713 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-25 20:07:15,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:15,714 INFO L225 Difference]: With dead ends: 45 [2021-11-25 20:07:15,714 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 20:07:15,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:07:15,715 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 14 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:15,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 46 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:15,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 20:07:15,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-11-25 20:07:15,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 44 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2021-11-25 20:07:15,721 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 7 [2021-11-25 20:07:15,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:15,721 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2021-11-25 20:07:15,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:15,721 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2021-11-25 20:07:15,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:07:15,722 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:15,722 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:15,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:07:15,723 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:15,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:15,723 INFO L85 PathProgramCache]: Analyzing trace with hash -485540104, now seen corresponding path program 1 times [2021-11-25 20:07:15,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:15,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402955112] [2021-11-25 20:07:15,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:15,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:15,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:15,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:15,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:15,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402955112] [2021-11-25 20:07:15,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402955112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:15,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932362795] [2021-11-25 20:07:15,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:15,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:15,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:15,779 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:15,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:07:15,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:15,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:07:15,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:15,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:15,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:15,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:15,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932362795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:15,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1252565954] [2021-11-25 20:07:15,913 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:07:15,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:15,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:15,913 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:15,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:15,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:15,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:15,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 20:07:16,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:16,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:16,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:16,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-11-25 20:07:16,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:16,150 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:16,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:16,196 INFO L354 Elim1Store]: treesize reduction 118, result has 20.3 percent of original size [2021-11-25 20:07:16,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 298 treesize of output 298 [2021-11-25 20:07:16,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:16,304 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:16,473 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '702#(and (<= 4 ~b~0.offset) (<= ~b~0.offset 4) (< (select |#length| ~b~0.base) (+ ~b~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|) 4)) (= ~a~0.offset 0) (= |ULTIMATE.start_foo_~i~0#1| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:16,473 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:16,473 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:16,473 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-25 20:07:16,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498784001] [2021-11-25 20:07:16,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:16,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 20:07:16,474 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:16,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 20:07:16,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:07:16,475 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:16,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:16,551 INFO L93 Difference]: Finished difference Result 75 states and 78 transitions. [2021-11-25 20:07:16,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:07:16,553 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 20:07:16,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:16,554 INFO L225 Difference]: With dead ends: 75 [2021-11-25 20:07:16,555 INFO L226 Difference]: Without dead ends: 75 [2021-11-25 20:07:16,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-11-25 20:07:16,556 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 227 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:16,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 130 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:16,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-25 20:07:16,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 45. [2021-11-25 20:07:16,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 33 states have (on average 1.4545454545454546) internal successors, (48), 44 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:16,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-11-25 20:07:16,567 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 7 [2021-11-25 20:07:16,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:16,567 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-11-25 20:07:16,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 9 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:16,568 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-11-25 20:07:16,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 20:07:16,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:16,568 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2021-11-25 20:07:16,605 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:16,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:16,791 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:16,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:16,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1172884082, now seen corresponding path program 2 times [2021-11-25 20:07:16,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:16,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637489130] [2021-11-25 20:07:16,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:16,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:16,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:16,974 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:16,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:16,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637489130] [2021-11-25 20:07:16,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637489130] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:16,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56634317] [2021-11-25 20:07:16,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:16,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:16,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:16,977 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:16,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:07:17,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:07:17,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:17,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:07:17,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:17,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:07:17,063 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 [2021-11-25 20:07:17,182 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:07:17,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:17,349 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:07:17,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56634317] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:17,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [791528987] [2021-11-25 20:07:17,351 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 20:07:17,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:17,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:17,352 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:17,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:17,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:17,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:07:17,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 38 [2021-11-25 20:07:17,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:17,539 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:17,579 INFO L354 Elim1Store]: treesize reduction 112, result has 20.0 percent of original size [2021-11-25 20:07:17,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 292 treesize of output 294 [2021-11-25 20:07:17,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:17,687 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:17,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '911#(and (< |ULTIMATE.start_foo_~i~0#1| ~n~0) (< (select |#length| ~a~0.base) (+ ~a~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|) 4)) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:17,878 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:17,878 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:17,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 3] total 12 [2021-11-25 20:07:17,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846129667] [2021-11-25 20:07:17,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:17,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:07:17,879 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:17,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:07:17,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:07:17,880 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:18,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:18,483 INFO L93 Difference]: Finished difference Result 198 states and 208 transitions. [2021-11-25 20:07:18,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:07:18,487 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 20:07:18,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:18,489 INFO L225 Difference]: With dead ends: 198 [2021-11-25 20:07:18,489 INFO L226 Difference]: Without dead ends: 198 [2021-11-25 20:07:18,489 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=150, Invalid=552, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:07:18,490 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 592 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:18,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [592 Valid, 192 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:07:18,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-25 20:07:18,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 43. [2021-11-25 20:07:18,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 32 states have (on average 1.4375) internal successors, (46), 42 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:18,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-11-25 20:07:18,498 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 12 [2021-11-25 20:07:18,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:18,498 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-11-25 20:07:18,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:18,498 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-11-25 20:07:18,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:07:18,499 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:18,499 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2021-11-25 20:07:18,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:18,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:18,715 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:18,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:18,715 INFO L85 PathProgramCache]: Analyzing trace with hash -1999597553, now seen corresponding path program 2 times [2021-11-25 20:07:18,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:18,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098706622] [2021-11-25 20:07:18,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:18,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:18,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:18,785 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:07:18,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:18,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098706622] [2021-11-25 20:07:18,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098706622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:18,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700150622] [2021-11-25 20:07:18,786 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:18,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:18,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:18,787 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:18,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:07:18,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-25 20:07:18,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:18,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:07:18,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:18,867 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:07:18,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:07:18,967 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:07:18,967 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:07:18,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700150622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:18,968 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:07:18,968 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [7] total 9 [2021-11-25 20:07:18,968 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846061149] [2021-11-25 20:07:18,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:18,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:07:18,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:18,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:07:18,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:07:18,970 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:19,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:19,003 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2021-11-25 20:07:19,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:07:19,003 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 [2021-11-25 20:07:19,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:19,004 INFO L225 Difference]: With dead ends: 37 [2021-11-25 20:07:19,004 INFO L226 Difference]: Without dead ends: 37 [2021-11-25 20:07:19,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:07:19,005 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:19,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 24 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:19,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-25 20:07:19,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-25 20:07:19,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:19,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-11-25 20:07:19,009 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 13 [2021-11-25 20:07:19,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:19,010 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-11-25 20:07:19,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:19,010 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-11-25 20:07:19,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 20:07:19,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:19,011 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1] [2021-11-25 20:07:19,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:19,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:19,226 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:19,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:19,227 INFO L85 PathProgramCache]: Analyzing trace with hash -1762822881, now seen corresponding path program 1 times [2021-11-25 20:07:19,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:19,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923189035] [2021-11-25 20:07:19,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:19,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:19,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:19,294 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:07:19,294 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:19,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923189035] [2021-11-25 20:07:19,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923189035] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:19,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [310993371] [2021-11-25 20:07:19,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:19,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:19,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:19,296 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:19,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:07:19,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:19,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:07:19,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:19,464 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:07:19,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:19,579 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:07:19,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [310993371] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:19,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1408998486] [2021-11-25 20:07:19,584 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:07:19,584 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:19,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:19,585 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:19,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:19,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:19,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 20:07:19,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-25 20:07:19,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,780 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:19,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,811 INFO L354 Elim1Store]: treesize reduction 118, result has 12.6 percent of original size [2021-11-25 20:07:19,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 297 [2021-11-25 20:07:19,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:19,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:19,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:19,917 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 71 treesize of output 70 [2021-11-25 20:07:19,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:19,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:19,997 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:20,279 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1397#(and (<= 4 ~b~0.offset) (<= ~b~0.offset 4) (< (select |#length| ~b~0.base) (+ ~b~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|) 4)) (= ~a~0.offset 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:20,279 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:20,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:20,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2021-11-25 20:07:20,280 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360758867] [2021-11-25 20:07:20,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:20,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:07:20,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:20,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:07:20,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=381, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:07:20,281 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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) [2021-11-25 20:07:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:20,475 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2021-11-25 20:07:20,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:07:20,476 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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 15 [2021-11-25 20:07:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:20,477 INFO L225 Difference]: With dead ends: 150 [2021-11-25 20:07:20,477 INFO L226 Difference]: Without dead ends: 150 [2021-11-25 20:07:20,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=247, Invalid=565, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:07:20,479 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 332 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:20,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 152 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:07:20,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-25 20:07:20,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 55. [2021-11-25 20:07:20,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 54 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:20,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2021-11-25 20:07:20,484 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 15 [2021-11-25 20:07:20,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:20,485 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2021-11-25 20:07:20,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 18 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) [2021-11-25 20:07:20,485 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2021-11-25 20:07:20,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:07:20,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:20,486 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1] [2021-11-25 20:07:20,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:20,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:07:20,711 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:20,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:20,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1682562061, now seen corresponding path program 2 times [2021-11-25 20:07:20,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:20,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284061861] [2021-11-25 20:07:20,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:20,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:20,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:20,865 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:07:20,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284061861] [2021-11-25 20:07:20,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284061861] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:20,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173377149] [2021-11-25 20:07:20,866 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:20,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:20,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:20,867 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:20,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:07:20,924 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:07:20,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:20,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:07:20,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:20,947 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:07:20,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:07:21,152 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-25 20:07:21,152 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:07:21,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173377149] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:21,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:07:21,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [13] total 17 [2021-11-25 20:07:21,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014083921] [2021-11-25 20:07:21,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:21,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:07:21,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:21,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:07:21,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:07:21,155 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:21,202 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-11-25 20:07:21,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:07:21,203 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-25 20:07:21,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:21,204 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:07:21,204 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:07:21,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:07:21,205 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:21,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 24 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:21,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:07:21,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-25 20:07:21,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 48 states have (on average 1.1458333333333333) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-25 20:07:21,210 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 27 [2021-11-25 20:07:21,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:21,210 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-25 20:07:21,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,211 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-25 20:07:21,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:07:21,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:21,212 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:21,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:21,426 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-25 20:07:21,427 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:21,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:21,427 INFO L85 PathProgramCache]: Analyzing trace with hash 218583903, now seen corresponding path program 1 times [2021-11-25 20:07:21,427 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:21,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650763190] [2021-11-25 20:07:21,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:21,428 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:21,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:21,512 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2021-11-25 20:07:21,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:21,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650763190] [2021-11-25 20:07:21,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650763190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:07:21,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:07:21,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 20:07:21,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784872768] [2021-11-25 20:07:21,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:07:21,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:07:21,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:21,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:07:21,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:21,515 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:21,528 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2021-11-25 20:07:21,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:07:21,528 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2021-11-25 20:07:21,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:21,529 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:07:21,529 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:07:21,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:07:21,530 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:21,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:07:21,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:07:21,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-25 20:07:21,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-11-25 20:07:21,545 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 38 [2021-11-25 20:07:21,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:21,546 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-11-25 20:07:21,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:21,547 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-11-25 20:07:21,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:07:21,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:21,550 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:21,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 20:07:21,551 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:21,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:21,551 INFO L85 PathProgramCache]: Analyzing trace with hash -407623917, now seen corresponding path program 1 times [2021-11-25 20:07:21,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:21,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075170532] [2021-11-25 20:07:21,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:21,552 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:21,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:21,653 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-25 20:07:21,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:21,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075170532] [2021-11-25 20:07:21,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075170532] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:21,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635091729] [2021-11-25 20:07:21,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:21,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:21,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:21,659 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:21,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:07:21,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:21,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:07:21,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:21,992 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:07:21,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:22,305 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:07:22,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635091729] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:22,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428550593] [2021-11-25 20:07:22,308 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:07:22,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:22,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:22,309 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:22,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:22,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:22,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:07:22,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 43 [2021-11-25 20:07:22,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:22,524 INFO L354 Elim1Store]: treesize reduction 110, result has 12.0 percent of original size [2021-11-25 20:07:22,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 297 treesize of output 293 [2021-11-25 20:07:22,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:22,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:07:22,649 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:07:22,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 77 [2021-11-25 20:07:22,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:22,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:22,777 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 20:07:22,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-25 20:07:22,799 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:23,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2194#(and (< ~a~0.base |#StackHeapBarrier|) (= (+ (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4) (* |ULTIMATE.start_foo_~i~0#1| 4))) 1) 0) (or (= (select |#valid| ~b~0.base) 1) (= ~a~0.base ~b~0.base)) (<= 32767 |ULTIMATE.start_foo_~i~0#1|) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= (+ ~b~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|)) (select |#length| ~b~0.base)) (= |#NULL.offset| 0) (= (select |#valid| ~a~0.base) 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:23,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:23,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:23,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13] total 32 [2021-11-25 20:07:23,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014321718] [2021-11-25 20:07:23,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:23,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 20:07:23,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:23,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 20:07:23,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=1238, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:07:23,363 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:23,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:23,821 INFO L93 Difference]: Finished difference Result 288 states and 289 transitions. [2021-11-25 20:07:23,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:07:23,822 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:07:23,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:23,825 INFO L225 Difference]: With dead ends: 288 [2021-11-25 20:07:23,826 INFO L226 Difference]: Without dead ends: 288 [2021-11-25 20:07:23,829 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 997 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=732, Invalid=2024, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:07:23,831 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 738 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 738 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:23,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [738 Valid, 272 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:07:23,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-25 20:07:23,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 88. [2021-11-25 20:07:23,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 84 states have (on average 1.0595238095238095) internal successors, (89), 87 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:23,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2021-11-25 20:07:23,851 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 40 [2021-11-25 20:07:23,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:23,853 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2021-11-25 20:07:23,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 32 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:23,854 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2021-11-25 20:07:23,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-25 20:07:23,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:23,855 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:23,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:24,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:24,079 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:24,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:24,080 INFO L85 PathProgramCache]: Analyzing trace with hash 521244247, now seen corresponding path program 2 times [2021-11-25 20:07:24,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:24,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023445610] [2021-11-25 20:07:24,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:24,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:24,249 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-11-25 20:07:24,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:24,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023445610] [2021-11-25 20:07:24,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023445610] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:24,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927390120] [2021-11-25 20:07:24,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:24,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:24,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:24,251 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:24,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:07:24,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-25 20:07:24,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:24,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:07:24,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:24,791 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-11-25 20:07:24,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:25,085 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-11-25 20:07:25,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927390120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:25,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929506907] [2021-11-25 20:07:25,088 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:07:25,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:25,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:25,088 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:25,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:25,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:25,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 20:07:25,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-25 20:07:25,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,303 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:25,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:25,335 INFO L354 Elim1Store]: treesize reduction 118, result has 12.6 percent of original size [2021-11-25 20:07:25,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 297 [2021-11-25 20:07:25,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:25,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:07:25,443 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-25 20:07:25,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 71 [2021-11-25 20:07:25,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:25,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:25,576 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 20:07:25,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-25 20:07:25,599 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:26,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3092#(and (< ~a~0.base |#StackHeapBarrier|) (= (+ (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4) (* |ULTIMATE.start_foo_~i~0#1| 4))) 1) 0) (<= 4 ~b~0.offset) (or (= (select |#valid| ~b~0.base) 1) (= ~a~0.base ~b~0.base)) (<= 32767 |ULTIMATE.start_foo_~i~0#1|) (<= ~b~0.offset 4) (= ~a~0.offset 0) (<= (+ ~b~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|)) (select |#length| ~b~0.base)) (= |#NULL.offset| 0) (= (select |#valid| ~a~0.base) 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:26,250 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:26,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:26,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-25 20:07:26,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107707389] [2021-11-25 20:07:26,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:26,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:07:26,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:26,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:07:26,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=876, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:07:26,252 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 27 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:26,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:26,425 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2021-11-25 20:07:26,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:07:26,425 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 27 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-25 20:07:26,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:26,426 INFO L225 Difference]: With dead ends: 119 [2021-11-25 20:07:26,426 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 20:07:26,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=384, Invalid=876, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:07:26,427 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 123 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:26,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 34 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:07:26,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 20:07:26,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 114. [2021-11-25 20:07:26,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 110 states have (on average 1.0454545454545454) internal successors, (115), 113 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:26,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2021-11-25 20:07:26,431 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 76 [2021-11-25 20:07:26,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:26,432 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2021-11-25 20:07:26,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 27 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:26,432 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2021-11-25 20:07:26,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-25 20:07:26,433 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:26,434 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:26,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:26,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:07:26,659 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:26,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:26,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1007289593, now seen corresponding path program 3 times [2021-11-25 20:07:26,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:26,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871926146] [2021-11-25 20:07:26,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:26,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:26,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:27,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1060 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2021-11-25 20:07:27,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:27,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871926146] [2021-11-25 20:07:27,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871926146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:27,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865236719] [2021-11-25 20:07:27,084 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:07:27,085 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:27,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:27,086 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:27,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:07:37,602 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:07:37,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:07:37,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:07:37,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:38,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1060 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2021-11-25 20:07:38,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1060 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2021-11-25 20:07:39,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865236719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:39,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919154090] [2021-11-25 20:07:39,203 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:07:39,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:39,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:39,203 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:39,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:39,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:39,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-25 20:07:39,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 45 [2021-11-25 20:07:39,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:07:39,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,419 INFO L354 Elim1Store]: treesize reduction 118, result has 12.6 percent of original size [2021-11-25 20:07:39,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 303 treesize of output 297 [2021-11-25 20:07:39,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:39,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:39,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:39,510 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 71 treesize of output 70 [2021-11-25 20:07:39,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:39,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:39,599 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 20:07:39,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-25 20:07:39,617 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:40,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4015#(and (< ~a~0.base |#StackHeapBarrier|) (= (+ (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4) (* |ULTIMATE.start_foo_~i~0#1| 4))) 1) 0) (<= 4 ~b~0.offset) (or (= (select |#valid| ~b~0.base) 1) (= ~a~0.base ~b~0.base)) (<= 32767 |ULTIMATE.start_foo_~i~0#1|) (<= ~b~0.offset 4) (= ~a~0.offset 0) (<= (+ ~b~0.offset (* 4 |ULTIMATE.start_foo_~i~0#1|)) (select |#length| ~b~0.base)) (= |#NULL.offset| 0) (= (select |#valid| ~a~0.base) 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:40,321 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:40,321 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:40,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 25, 25] total 75 [2021-11-25 20:07:40,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684182381] [2021-11-25 20:07:40,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:40,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-25 20:07:40,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:40,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-25 20:07:40,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1902, Invalid=5070, Unknown=0, NotChecked=0, Total=6972 [2021-11-25 20:07:40,326 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 75 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:41,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:41,761 INFO L93 Difference]: Finished difference Result 608 states and 609 transitions. [2021-11-25 20:07:41,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-25 20:07:41,775 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 75 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-25 20:07:41,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:41,781 INFO L225 Difference]: With dead ends: 608 [2021-11-25 20:07:41,782 INFO L226 Difference]: Without dead ends: 608 [2021-11-25 20:07:41,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4665 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3303, Invalid=8687, Unknown=0, NotChecked=0, Total=11990 [2021-11-25 20:07:41,791 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 2128 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2128 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:41,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2128 Valid, 442 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:07:41,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-11-25 20:07:41,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 168. [2021-11-25 20:07:41,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 164 states have (on average 1.0304878048780488) internal successors, (169), 167 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:41,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2021-11-25 20:07:41,801 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 102 [2021-11-25 20:07:41,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:41,802 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2021-11-25 20:07:41,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 75 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:41,803 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2021-11-25 20:07:41,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 20:07:41,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:41,815 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:41,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:42,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:07:42,030 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:42,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:42,031 INFO L85 PathProgramCache]: Analyzing trace with hash 848763653, now seen corresponding path program 4 times [2021-11-25 20:07:42,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:42,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024662827] [2021-11-25 20:07:42,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:42,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:42,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:42,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2929 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 2304 trivial. 0 not checked. [2021-11-25 20:07:42,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:42,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024662827] [2021-11-25 20:07:42,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024662827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:42,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734358244] [2021-11-25 20:07:42,517 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:07:42,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:42,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:42,518 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:42,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:07:42,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:42,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 884 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-25 20:07:42,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:07:44,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2929 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2021-11-25 20:07:44,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:07:47,015 INFO L134 CoverageAnalysis]: Checked inductivity of 2929 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2021-11-25 20:07:47,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734358244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:07:47,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77233227] [2021-11-25 20:07:47,018 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-25 20:07:47,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:07:47,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:07:47,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:07:47,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:07:47,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 31 [2021-11-25 20:07:47,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 20:07:47,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 43 [2021-11-25 20:07:47,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,171 INFO L354 Elim1Store]: treesize reduction 110, result has 12.0 percent of original size [2021-11-25 20:07:47,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 297 treesize of output 293 [2021-11-25 20:07:47,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:47,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:47,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:07:47,282 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 77 treesize of output 76 [2021-11-25 20:07:47,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:47,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 20:07:47,422 INFO L354 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2021-11-25 20:07:47,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 33 [2021-11-25 20:07:47,432 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:07:48,895 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5936#(and (< ~a~0.base |#StackHeapBarrier|) (or (= (select |#valid| ~b~0.base) 1) (= ~a~0.base ~b~0.base)) (<= 32767 |ULTIMATE.start_foo_~i~0#1|) (<= ~b~0.offset (select |#length| ~b~0.base)) (= ~b~0.offset 4) (= ~a~0.offset 0) (= |#NULL.offset| 0) (= (select |#valid| ~a~0.base) 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= ~n~0 32768))' at error location [2021-11-25 20:07:48,895 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:07:48,895 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:07:48,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 51, 51] total 128 [2021-11-25 20:07:48,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155688628] [2021-11-25 20:07:48,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:07:48,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-25 20:07:48,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:07:48,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-25 20:07:48,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5824, Invalid=12536, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 20:07:48,904 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 128 states, 128 states have (on average 2.0546875) internal successors, (263), 128 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:53,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:07:53,727 INFO L93 Difference]: Finished difference Result 1276 states and 1277 transitions. [2021-11-25 20:07:53,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-25 20:07:53,736 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.0546875) internal successors, (263), 128 states have internal predecessors, (263), 0 states have call successors, (0), 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 156 [2021-11-25 20:07:53,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:07:53,743 INFO L225 Difference]: With dead ends: 1276 [2021-11-25 20:07:53,743 INFO L226 Difference]: Without dead ends: 1276 [2021-11-25 20:07:53,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 385 SyntacticMatches, 25 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16813 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=11000, Invalid=23410, Unknown=0, NotChecked=0, Total=34410 [2021-11-25 20:07:53,749 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 5309 mSDsluCounter, 1044 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 777 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5309 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 1320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 777 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:07:53,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5309 Valid, 1054 Invalid, 1320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [777 Valid, 543 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:07:53,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1276 states. [2021-11-25 20:07:53,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1276 to 316. [2021-11-25 20:07:53,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 312 states have (on average 1.016025641025641) internal successors, (317), 315 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:53,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2021-11-25 20:07:53,763 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 156 [2021-11-25 20:07:53,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:07:53,763 INFO L470 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2021-11-25 20:07:53,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.0546875) internal successors, (263), 128 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:07:53,764 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2021-11-25 20:07:53,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-25 20:07:53,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:07:53,768 INFO L514 BasicCegarLoop]: trace histogram [98, 98, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:07:53,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:07:53,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:53,995 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-11-25 20:07:53,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:07:53,995 INFO L85 PathProgramCache]: Analyzing trace with hash -349072293, now seen corresponding path program 5 times [2021-11-25 20:07:53,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:07:53,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100026546] [2021-11-25 20:07:53,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:07:53,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:07:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:07:55,449 INFO L134 CoverageAnalysis]: Checked inductivity of 12005 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 9604 trivial. 0 not checked. [2021-11-25 20:07:55,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:07:55,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100026546] [2021-11-25 20:07:55,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100026546] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:07:55,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878181338] [2021-11-25 20:07:55,450 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:07:55,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:07:55,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:07:55,451 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:07:55,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9c5caeb6-75d4-49a1-ae04-e38f239b05aa/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process