./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 66e52001defd7e771c0df8c73cdf4ec6b3d90072c8faf9f52fce6d45ff1a83e7 --- 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-b5237d8 [2022-11-22 02:19:24,657 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 02:19:24,659 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 02:19:24,680 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 02:19:24,681 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 02:19:24,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 02:19:24,683 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 02:19:24,685 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 02:19:24,687 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 02:19:24,688 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 02:19:24,689 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 02:19:24,690 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 02:19:24,691 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 02:19:24,692 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 02:19:24,693 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 02:19:24,694 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 02:19:24,695 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 02:19:24,696 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 02:19:24,698 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 02:19:24,700 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 02:19:24,701 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 02:19:24,703 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 02:19:24,704 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 02:19:24,705 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 02:19:24,709 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 02:19:24,709 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 02:19:24,710 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 02:19:24,711 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 02:19:24,711 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 02:19:24,712 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 02:19:24,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 02:19:24,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 02:19:24,714 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 02:19:24,715 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 02:19:24,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 02:19:24,717 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 02:19:24,718 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 02:19:24,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 02:19:24,719 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 02:19:24,720 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 02:19:24,721 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 02:19:24,725 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 02:19:24,776 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 02:19:24,776 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 02:19:24,776 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 02:19:24,777 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 02:19:24,777 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 02:19:24,777 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 02:19:24,778 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 02:19:24,778 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 02:19:24,778 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 02:19:24,778 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 02:19:24,779 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 02:19:24,779 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 02:19:24,779 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 02:19:24,779 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 02:19:24,780 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 02:19:24,780 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 02:19:24,780 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 02:19:24,780 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 02:19:24,781 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 02:19:24,781 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 02:19:24,781 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 02:19:24,782 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 02:19:24,782 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 02:19:24,782 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 02:19:24,782 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 02:19:24,783 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 02:19:24,783 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 02:19:24,790 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 02:19:24,791 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 02:19:24,791 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 02:19:24,791 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 02:19:24,791 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 02:19:24,791 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:19:24,792 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 02:19:24,792 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 02:19:24,792 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 02:19:24,793 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 02:19:24,793 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 02:19:24,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 02:19:24,794 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 02:19:24,794 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 02:19:24,794 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_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 66e52001defd7e771c0df8c73cdf4ec6b3d90072c8faf9f52fce6d45ff1a83e7 [2022-11-22 02:19:25,077 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 02:19:25,120 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 02:19:25,123 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 02:19:25,124 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 02:19:25,125 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 02:19:25,126 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-11-22 02:19:28,230 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 02:19:28,455 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 02:19:28,455 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-11-22 02:19:28,464 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/data/7dafee402/b9b4de375f32418394d9b9b7182fe928/FLAG034232b9c [2022-11-22 02:19:28,478 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/data/7dafee402/b9b4de375f32418394d9b9b7182fe928 [2022-11-22 02:19:28,481 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 02:19:28,482 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 02:19:28,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 02:19:28,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 02:19:28,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 02:19:28,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,489 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@531f11f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28, skipping insertion in model container [2022-11-22 02:19:28,490 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,497 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 02:19:28,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 02:19:28,708 WARN L237 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_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c[6080,6093] [2022-11-22 02:19:28,712 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:19:28,723 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 02:19:28,762 WARN L237 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_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.UNBOUNDED.pals.c[6080,6093] [2022-11-22 02:19:28,763 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 02:19:28,778 INFO L208 MainTranslator]: Completed translation [2022-11-22 02:19:28,779 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28 WrapperNode [2022-11-22 02:19:28,779 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 02:19:28,780 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 02:19:28,780 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 02:19:28,780 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 02:19:28,788 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,796 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,821 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 208 [2022-11-22 02:19:28,821 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 02:19:28,822 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 02:19:28,822 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 02:19:28,823 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 02:19:28,832 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,832 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,834 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,835 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,840 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,846 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,848 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,850 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 02:19:28,851 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 02:19:28,851 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 02:19:28,852 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 02:19:28,852 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (1/1) ... [2022-11-22 02:19:28,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 02:19:28,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:28,885 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 02:19:28,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 02:19:28,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 02:19:28,951 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 02:19:28,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 02:19:28,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 02:19:29,107 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 02:19:29,109 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 02:19:29,566 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 02:19:29,947 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 02:19:29,947 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-22 02:19:29,950 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:19:29 BoogieIcfgContainer [2022-11-22 02:19:29,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 02:19:29,978 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 02:19:29,978 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 02:19:29,981 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 02:19:29,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 02:19:28" (1/3) ... [2022-11-22 02:19:29,982 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f0bc9fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:19:29, skipping insertion in model container [2022-11-22 02:19:29,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 02:19:28" (2/3) ... [2022-11-22 02:19:29,985 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f0bc9fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 02:19:29, skipping insertion in model container [2022-11-22 02:19:29,985 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 02:19:29" (3/3) ... [2022-11-22 02:19:29,987 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.UNBOUNDED.pals.c [2022-11-22 02:19:30,007 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 02:19:30,007 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 02:19:30,059 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 02:19:30,066 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;@6f4406c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 02:19:30,066 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 02:19:30,070 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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) [2022-11-22 02:19:30,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-22 02:19:30,075 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:30,076 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-22 02:19:30,076 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:30,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:30,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1828021251, now seen corresponding path program 1 times [2022-11-22 02:19:30,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:30,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021440230] [2022-11-22 02:19:30,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:30,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:30,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:31,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:31,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:31,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021440230] [2022-11-22 02:19:31,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021440230] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:31,181 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:31,182 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:19:31,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569170770] [2022-11-22 02:19:31,184 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:31,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:19:31,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:31,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:19:31,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:31,228 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-22 02:19:31,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:31,297 INFO L93 Difference]: Finished difference Result 33 states and 48 transitions. [2022-11-22 02:19:31,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:19:31,299 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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 [2022-11-22 02:19:31,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:31,327 INFO L225 Difference]: With dead ends: 33 [2022-11-22 02:19:31,327 INFO L226 Difference]: Without dead ends: 22 [2022-11-22 02:19:31,330 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:31,334 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:31,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:19:31,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-22 02:19:31,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2022-11-22 02:19:31,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 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) [2022-11-22 02:19:31,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-22 02:19:31,381 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-11-22 02:19:31,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:31,382 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-22 02:19:31,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 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) [2022-11-22 02:19:31,383 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-22 02:19:31,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:19:31,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:31,384 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:31,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 02:19:31,384 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:31,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:31,388 INFO L85 PathProgramCache]: Analyzing trace with hash -669841461, now seen corresponding path program 1 times [2022-11-22 02:19:31,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:31,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930373334] [2022-11-22 02:19:31,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:31,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:31,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:31,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:31,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:31,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930373334] [2022-11-22 02:19:31,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930373334] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:31,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:31,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:19:31,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308461104] [2022-11-22 02:19:31,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:31,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:19:31,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:31,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:19:31,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:31,855 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 02:19:31,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:31,895 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-22 02:19:31,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:19:31,896 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) Word has length 8 [2022-11-22 02:19:31,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:31,896 INFO L225 Difference]: With dead ends: 32 [2022-11-22 02:19:31,897 INFO L226 Difference]: Without dead ends: 22 [2022-11-22 02:19:31,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:31,899 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:31,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 02:19:31,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-22 02:19:31,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2022-11-22 02:19:31,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 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) [2022-11-22 02:19:31,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-22 02:19:31,905 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2022-11-22 02:19:31,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:31,905 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-22 02:19:31,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 02:19:31,906 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-22 02:19:31,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 02:19:31,906 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:31,906 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:31,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 02:19:31,907 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:31,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:31,908 INFO L85 PathProgramCache]: Analyzing trace with hash -669841461, now seen corresponding path program 1 times [2022-11-22 02:19:31,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:31,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576019868] [2022-11-22 02:19:31,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:31,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:31,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:32,522 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:32,523 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:32,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576019868] [2022-11-22 02:19:32,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576019868] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:32,525 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:32,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-22 02:19:32,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062488661] [2022-11-22 02:19:32,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:32,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-22 02:19:32,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:32,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-22 02:19:32,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:32,530 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 02:19:32,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:32,596 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2022-11-22 02:19:32,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-22 02:19:32,597 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) Word has length 8 [2022-11-22 02:19:32,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:32,599 INFO L225 Difference]: With dead ends: 32 [2022-11-22 02:19:32,599 INFO L226 Difference]: Without dead ends: 22 [2022-11-22 02:19:32,604 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-22 02:19:32,608 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:32,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 20 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:19:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-11-22 02:19:32,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2022-11-22 02:19:32,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:19:32,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-22 02:19:32,626 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2022-11-22 02:19:32,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:32,627 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-22 02:19:32,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2022-11-22 02:19:32,627 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-22 02:19:32,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-22 02:19:32,628 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:32,628 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:32,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-22 02:19:32,629 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:32,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:32,631 INFO L85 PathProgramCache]: Analyzing trace with hash 697881094, now seen corresponding path program 1 times [2022-11-22 02:19:32,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:32,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376685627] [2022-11-22 02:19:32,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:32,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:32,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:32,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:32,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:32,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376685627] [2022-11-22 02:19:32,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376685627] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 02:19:32,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 02:19:32,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-22 02:19:32,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982660100] [2022-11-22 02:19:32,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 02:19:32,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 02:19:32,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:19:32,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 02:19:32,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 02:19:32,847 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 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) [2022-11-22 02:19:32,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:19:32,950 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-11-22 02:19:32,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 02:19:32,950 INFO L78 Accepts]: Start accepts. Automaton has has 5 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 9 [2022-11-22 02:19:32,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:19:32,951 INFO L225 Difference]: With dead ends: 36 [2022-11-22 02:19:32,951 INFO L226 Difference]: Without dead ends: 34 [2022-11-22 02:19:32,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-22 02:19:32,953 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:19:32,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 46 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:19:32,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-11-22 02:19:32,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 18. [2022-11-22 02:19:32,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 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) [2022-11-22 02:19:32,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-11-22 02:19:32,959 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2022-11-22 02:19:32,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:19:32,960 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-11-22 02:19:32,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 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) [2022-11-22 02:19:32,960 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-11-22 02:19:32,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-22 02:19:32,961 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:19:32,961 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:19:32,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-22 02:19:32,961 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:19:32,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:19:32,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1661626914, now seen corresponding path program 1 times [2022-11-22 02:19:32,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:19:32,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005441834] [2022-11-22 02:19:32,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:32,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:19:33,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:35,964 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:35,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:19:35,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005441834] [2022-11-22 02:19:35,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005441834] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:19:35,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470565409] [2022-11-22 02:19:35,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:19:35,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:19:35,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:19:35,971 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:19:35,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 02:19:36,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:19:36,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-22 02:19:36,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:19:39,347 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:19:39,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:25:25,394 WARN L233 SmtUtils]: Spent 36.24s on a formula simplification. DAG size of input: 1671 DAG size of output: 1647 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:25:25,417 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:25:25,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470565409] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:25:25,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593036977] [2022-11-22 02:25:25,443 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-22 02:25:25,444 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:25:25,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:25:25,459 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:25:25,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:25:47,893 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:25:51,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '396#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (< 1 (+ ~st3~0 ~st2~0 ~st1~0)) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-11-22 02:25:51,701 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:25:51,701 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:25:51,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 8] total 16 [2022-11-22 02:25:51,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426726092] [2022-11-22 02:25:51,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:25:51,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 02:25:51,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:25:51,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 02:25:51,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:25:51,705 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 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) [2022-11-22 02:26:43,221 WARN L233 SmtUtils]: Spent 50.86s on a formula simplification. DAG size of input: 1716 DAG size of output: 1158 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:27:01,218 WARN L233 SmtUtils]: Spent 16.79s on a formula simplification that was a NOOP. DAG size: 1708 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:27:22,015 WARN L233 SmtUtils]: Spent 18.05s on a formula simplification that was a NOOP. DAG size: 1737 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-22 02:27:24,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:27:24,002 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2022-11-22 02:27:24,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 02:27:24,003 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 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 14 [2022-11-22 02:27:24,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:27:24,004 INFO L225 Difference]: With dead ends: 71 [2022-11-22 02:27:24,004 INFO L226 Difference]: Without dead ends: 58 [2022-11-22 02:27:24,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 133.6s TimeCoverageRelationStatistics Valid=336, Invalid=1146, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 02:27:24,006 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 158 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:27:24,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [158 Valid, 46 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-22 02:27:24,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-22 02:27:24,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 48. [2022-11-22 02:27:24,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.2127659574468086) internal successors, (57), 47 states have internal predecessors, (57), 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) [2022-11-22 02:27:24,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2022-11-22 02:27:24,076 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 14 [2022-11-22 02:27:24,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:27:24,076 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2022-11-22 02:27:24,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 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) [2022-11-22 02:27:24,077 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2022-11-22 02:27:24,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 02:27:24,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:27:24,078 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:27:24,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-22 02:27:24,279 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:24,279 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:27:24,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:27:24,280 INFO L85 PathProgramCache]: Analyzing trace with hash 147730150, now seen corresponding path program 1 times [2022-11-22 02:27:24,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:27:24,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189703874] [2022-11-22 02:27:24,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:24,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:27:24,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:25,064 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:27:25,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:27:25,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189703874] [2022-11-22 02:27:25,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189703874] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:27:25,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550299319] [2022-11-22 02:27:25,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:27:25,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:27:25,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:27:25,067 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:27:25,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 02:27:25,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:27:25,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-22 02:27:25,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:27:25,916 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:27:25,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:27:26,887 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:27:26,887 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550299319] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:27:26,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [118160246] [2022-11-22 02:27:26,889 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-22 02:27:26,889 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:27:26,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:27:26,890 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:27:26,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:28:59,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:29:03,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= (+ ~st3~0 ~st2~0 ~st1~0) 1) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (not (= (+ ~st3~0 ~st2~0 ~st1~0) 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (not (< (mod ~r1~0 256) 3)) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-11-22 02:29:03,992 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:29:03,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:29:03,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8] total 18 [2022-11-22 02:29:03,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447414842] [2022-11-22 02:29:03,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:29:03,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:29:03,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:29:03,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:29:03,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:29:03,994 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 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) [2022-11-22 02:29:05,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:29:05,008 INFO L93 Difference]: Finished difference Result 112 states and 133 transitions. [2022-11-22 02:29:05,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 02:29:05,009 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 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) Word has length 16 [2022-11-22 02:29:05,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:29:05,011 INFO L225 Difference]: With dead ends: 112 [2022-11-22 02:29:05,011 INFO L226 Difference]: Without dead ends: 80 [2022-11-22 02:29:05,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 546 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=351, Invalid=1055, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 02:29:05,012 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 160 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-22 02:29:05,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 94 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-22 02:29:05,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-22 02:29:05,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 64. [2022-11-22 02:29:05,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.1904761904761905) internal successors, (75), 63 states have internal predecessors, (75), 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) [2022-11-22 02:29:05,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 75 transitions. [2022-11-22 02:29:05,102 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 75 transitions. Word has length 16 [2022-11-22 02:29:05,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:29:05,102 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 75 transitions. [2022-11-22 02:29:05,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 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) [2022-11-22 02:29:05,102 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 75 transitions. [2022-11-22 02:29:05,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 02:29:05,103 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:29:05,103 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-22 02:29:05,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 02:29:05,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:05,309 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:29:05,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:29:05,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1588202241, now seen corresponding path program 1 times [2022-11-22 02:29:05,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:29:05,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182390252] [2022-11-22 02:29:05,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:05,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:29:05,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:29:06,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:29:06,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182390252] [2022-11-22 02:29:06,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182390252] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:29:06,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007464717] [2022-11-22 02:29:06,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:29:06,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:29:06,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:29:06,576 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:29:06,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 02:29:06,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:29:06,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-22 02:29:06,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:29:16,665 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:29:16,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:30:54,161 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:30:54,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007464717] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:30:54,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786633764] [2022-11-22 02:30:54,163 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-11-22 02:30:54,163 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:30:54,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:30:54,164 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:30:54,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:31:09,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:31:13,462 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1139#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (not (= (+ ~st3~0 ~st2~0 ~st1~0) 0)) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (not (<= 3 (mod ~r1~0 256))) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= (+ ~st3~0 ~st2~0 ~st1~0) 1) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-11-22 02:31:13,462 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:31:13,463 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:31:13,463 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 12] total 23 [2022-11-22 02:31:13,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877208385] [2022-11-22 02:31:13,463 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:31:13,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 02:31:13,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:31:13,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 02:31:13,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=903, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 02:31:13,465 INFO L87 Difference]: Start difference. First operand 64 states and 75 transitions. Second operand has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 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) [2022-11-22 02:32:17,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:32:17,673 INFO L93 Difference]: Finished difference Result 187 states and 223 transitions. [2022-11-22 02:32:17,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-22 02:32:17,674 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 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 24 [2022-11-22 02:32:17,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:32:17,675 INFO L225 Difference]: With dead ends: 187 [2022-11-22 02:32:17,675 INFO L226 Difference]: Without dead ends: 147 [2022-11-22 02:32:17,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2075 ImplicationChecksByTransitivity, 76.4s TimeCoverageRelationStatistics Valid=841, Invalid=5965, Unknown=0, NotChecked=0, Total=6806 [2022-11-22 02:32:17,678 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 399 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 671 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 671 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:32:17,679 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [399 Valid, 200 Invalid, 736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 671 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-22 02:32:17,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-11-22 02:32:17,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 122. [2022-11-22 02:32:17,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.1735537190082646) internal successors, (142), 121 states have internal predecessors, (142), 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) [2022-11-22 02:32:17,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 142 transitions. [2022-11-22 02:32:17,850 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 142 transitions. Word has length 24 [2022-11-22 02:32:17,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:32:17,850 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 142 transitions. [2022-11-22 02:32:17,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.75) internal successors, (66), 23 states have internal predecessors, (66), 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) [2022-11-22 02:32:17,851 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 142 transitions. [2022-11-22 02:32:17,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 02:32:17,851 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:32:17,852 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1] [2022-11-22 02:32:17,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 02:32:18,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-22 02:32:18,053 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:32:18,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:32:18,054 INFO L85 PathProgramCache]: Analyzing trace with hash 471964700, now seen corresponding path program 2 times [2022-11-22 02:32:18,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:32:18,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326650903] [2022-11-22 02:32:18,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:32:18,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:32:18,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:32:30,872 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:32:30,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:32:30,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326650903] [2022-11-22 02:32:30,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326650903] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:32:30,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173849279] [2022-11-22 02:32:30,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:32:30,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:32:30,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:32:30,874 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:32:30,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_600d0a55-fd47-4dd6-b8dd-0b61eeb24faa/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 02:32:31,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 02:32:31,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:32:31,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-22 02:32:31,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:32:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:32:41,930 INFO L328 TraceCheckSpWp]: Computing backward predicates...