./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash e05ed42b8ab16978ef3b0a96b3fdc8d28f5de8905a756df890d884928ff52402 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-03 03:52:38,340 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:52:38,343 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:52:38,372 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:52:38,373 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:52:38,374 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:52:38,376 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:52:38,378 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:52:38,380 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:52:38,381 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:52:38,382 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:52:38,384 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:52:38,384 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:52:38,385 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:52:38,387 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:52:38,388 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:52:38,390 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:52:38,391 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:52:38,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:52:38,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:52:38,397 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:52:38,399 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:52:38,401 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:52:38,402 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:52:38,407 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:52:38,407 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:52:38,408 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:52:38,409 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:52:38,410 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:52:38,411 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:52:38,412 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:52:38,413 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:52:38,415 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:52:38,416 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:52:38,417 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:52:38,418 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:52:38,419 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:52:38,420 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:52:38,420 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:52:38,421 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:52:38,423 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:52:38,424 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-11-03 03:52:38,457 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:52:38,467 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:52:38,468 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:52:38,469 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:52:38,470 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:52:38,470 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:52:38,470 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:52:38,471 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:52:38,471 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:52:38,471 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:52:38,473 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:52:38,473 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:52:38,473 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:52:38,474 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:52:38,474 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:52:38,474 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:52:38,474 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:52:38,475 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:52:38,476 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:52:38,476 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:52:38,476 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:52:38,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 03:52:38,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:52:38,478 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 03:52:38,479 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 03:52:38,479 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:52:38,479 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 03:52:38,480 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:52:38,480 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:52:38,480 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:52:38,480 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:52:38,481 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:52:38,482 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:52:38,482 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 03:52:38,483 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:52:38,483 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:52:38,483 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 03:52:38,483 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:52:38,484 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e05ed42b8ab16978ef3b0a96b3fdc8d28f5de8905a756df890d884928ff52402 [2022-11-03 03:52:38,785 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:52:38,809 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:52:38,812 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:52:38,813 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:52:38,814 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:52:38,815 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c [2022-11-03 03:52:38,908 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/data/2897f71f1/cc021aa000e84557ae03f163cbf90737/FLAGf2585e730 [2022-11-03 03:52:39,596 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:52:39,597 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c [2022-11-03 03:52:39,622 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/data/2897f71f1/cc021aa000e84557ae03f163cbf90737/FLAGf2585e730 [2022-11-03 03:52:39,745 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/data/2897f71f1/cc021aa000e84557ae03f163cbf90737 [2022-11-03 03:52:39,749 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:52:39,751 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:52:39,756 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:52:39,756 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:52:39,760 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:52:39,762 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:52:39" (1/1) ... [2022-11-03 03:52:39,764 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35cc2b2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:39, skipping insertion in model container [2022-11-03 03:52:39,765 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:52:39" (1/1) ... [2022-11-03 03:52:39,772 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:52:39,864 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:52:40,165 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c[1014,1027] [2022-11-03 03:52:40,762 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:52:40,766 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:52:40,803 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/sv-benchmarks/c/hardware-verification-bv/btor2c-lazyMod.peterson.7.prop1-back-serstep.c[1014,1027] [2022-11-03 03:52:41,025 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:52:41,037 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:52:41,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41 WrapperNode [2022-11-03 03:52:41,038 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:52:41,039 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:52:41,040 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:52:41,040 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:52:41,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,146 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,467 INFO L138 Inliner]: procedures = 11, calls = 3, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 3555 [2022-11-03 03:52:41,468 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:52:41,469 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:52:41,469 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:52:41,469 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:52:41,479 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,480 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,585 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,586 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,778 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,788 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,828 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,843 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,953 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:52:41,955 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:52:41,955 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:52:41,955 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:52:41,956 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (1/1) ... [2022-11-03 03:52:41,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:52:41,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:52:41,995 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:52:42,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_365783cd-2d14-4ae4-9712-918a3f9c06f3/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:52:42,039 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:52:42,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:52:42,807 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:52:42,809 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:53:53,799 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:54:28,121 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:54:28,121 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-03 03:54:28,123 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:54:28 BoogieIcfgContainer [2022-11-03 03:54:28,124 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:54:28,127 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:54:28,127 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:54:28,131 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:54:28,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:52:39" (1/3) ... [2022-11-03 03:54:28,133 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f305889 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:54:28, skipping insertion in model container [2022-11-03 03:54:28,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:52:41" (2/3) ... [2022-11-03 03:54:28,133 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f305889 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:54:28, skipping insertion in model container [2022-11-03 03:54:28,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:54:28" (3/3) ... [2022-11-03 03:54:28,135 INFO L112 eAbstractionObserver]: Analyzing ICFG btor2c-lazyMod.peterson.7.prop1-back-serstep.c [2022-11-03 03:54:28,159 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:54:28,159 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 03:54:28,222 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:54:28,232 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5122434c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:54:28,232 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 03:54:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:28,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-03 03:54:28,249 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:28,249 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-03 03:54:28,250 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:54:28,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:28,256 INFO L85 PathProgramCache]: Analyzing trace with hash 22889516, now seen corresponding path program 1 times [2022-11-03 03:54:28,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:54:28,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440776885] [2022-11-03 03:54:28,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:54:28,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:54:29,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:54:43,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:54:43,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:54:43,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440776885] [2022-11-03 03:54:43,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440776885] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:54:43,752 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:54:43,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:54:43,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52896907] [2022-11-03 03:54:43,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:54:43,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:54:43,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:54:43,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:54:43,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:54:43,803 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 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 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:45,911 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:48,295 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.33s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 03:54:48,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:54:48,355 INFO L93 Difference]: Finished difference Result 14 states and 19 transitions. [2022-11-03 03:54:48,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:54:48,357 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-03 03:54:48,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:54:48,366 INFO L225 Difference]: With dead ends: 14 [2022-11-03 03:54:48,367 INFO L226 Difference]: Without dead ends: 8 [2022-11-03 03:54:48,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:54:48,373 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:54:48,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 5 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2022-11-03 03:54:48,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-11-03 03:54:48,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-11-03 03:54:48,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:48,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2022-11-03 03:54:48,408 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 4 [2022-11-03 03:54:48,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:54:48,409 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2022-11-03 03:54:48,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:54:48,410 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2022-11-03 03:54:48,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 03:54:48,410 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:54:48,411 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2022-11-03 03:54:48,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 03:54:48,411 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:54:48,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:54:48,412 INFO L85 PathProgramCache]: Analyzing trace with hash -962976127, now seen corresponding path program 1 times [2022-11-03 03:54:48,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:54:48,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924900755] [2022-11-03 03:54:48,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:54:48,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms