./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh --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 d852cbbb6aa933b5bfc297e03d0d3456bac2eafa50ad19971e71951b44cb15d3 --- 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-2329fc7 [2022-12-14 12:16:45,802 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:16:45,804 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:16:45,821 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:16:45,822 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:16:45,823 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:16:45,824 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:16:45,825 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:16:45,827 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:16:45,828 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:16:45,829 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:16:45,830 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:16:45,830 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:16:45,831 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:16:45,832 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:16:45,833 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:16:45,833 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:16:45,834 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:16:45,836 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:16:45,837 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:16:45,839 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:16:45,840 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:16:45,841 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:16:45,841 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:16:45,845 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:16:45,845 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:16:45,845 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:16:45,846 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:16:45,846 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:16:45,847 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:16:45,847 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:16:45,848 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:16:45,849 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:16:45,849 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:16:45,850 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:16:45,850 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:16:45,851 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:16:45,851 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:16:45,851 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:16:45,852 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:16:45,852 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:16:45,853 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 12:16:45,871 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:16:45,871 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:16:45,872 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:16:45,872 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:16:45,873 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:16:45,873 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:16:45,873 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:16:45,873 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:16:45,873 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:16:45,873 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:16:45,874 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:16:45,874 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:16:45,875 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:16:45,875 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:16:45,875 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:16:45,876 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 12:16:45,877 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:16:45,877 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:16:45,877 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:16:45,877 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:16:45,877 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:16:45,877 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:16:45,878 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:16:45,878 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:16:45,879 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:16:45,879 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_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d852cbbb6aa933b5bfc297e03d0d3456bac2eafa50ad19971e71951b44cb15d3 [2022-12-14 12:16:46,045 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:16:46,065 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:16:46,068 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:16:46,069 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:16:46,069 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:16:46,071 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c [2022-12-14 12:16:48,710 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:16:48,891 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:16:48,892 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c [2022-12-14 12:16:48,899 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/data/7dea5db25/a25f9de27aef4af1bdf881c30b0a1bfc/FLAGdd0b64818 [2022-12-14 12:16:48,910 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/data/7dea5db25/a25f9de27aef4af1bdf881c30b0a1bfc [2022-12-14 12:16:48,912 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:16:48,913 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:16:48,914 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:16:48,914 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:16:48,917 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:16:48,917 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:16:48" (1/1) ... [2022-12-14 12:16:48,918 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a11110c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:48, skipping insertion in model container [2022-12-14 12:16:48,918 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:16:48" (1/1) ... [2022-12-14 12:16:48,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:16:48,947 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:16:49,088 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_617aec4a-ec62-4b93-96a9-4afefe10af8d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c[5984,5997] [2022-12-14 12:16:49,091 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:16:49,099 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:16:49,123 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_617aec4a-ec62-4b93-96a9-4afefe10af8d/sv-benchmarks/c/seq-mthreaded/pals_lcr.3.1.ufo.BOUNDED-6.pals.c[5984,5997] [2022-12-14 12:16:49,124 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:16:49,134 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:16:49,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49 WrapperNode [2022-12-14 12:16:49,135 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:16:49,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:16:49,136 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:16:49,136 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:16:49,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,147 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,163 INFO L138 Inliner]: procedures = 21, calls = 13, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 208 [2022-12-14 12:16:49,163 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:16:49,164 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:16:49,164 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:16:49,164 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:16:49,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,174 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,174 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,177 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,182 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,185 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:16:49,185 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:16:49,186 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:16:49,186 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:16:49,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (1/1) ... [2022-12-14 12:16:49,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:16:49,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:16:49,213 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:16:49,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:16:49,248 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:16:49,248 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:16:49,248 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:16:49,249 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:16:49,313 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:16:49,314 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:16:49,504 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:16:49,722 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:16:49,722 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 12:16:49,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:16:49 BoogieIcfgContainer [2022-12-14 12:16:49,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:16:49,726 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:16:49,726 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:16:49,729 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:16:49,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:16:48" (1/3) ... [2022-12-14 12:16:49,729 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19ce0928 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:16:49, skipping insertion in model container [2022-12-14 12:16:49,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:16:49" (2/3) ... [2022-12-14 12:16:49,730 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19ce0928 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:16:49, skipping insertion in model container [2022-12-14 12:16:49,730 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:16:49" (3/3) ... [2022-12-14 12:16:49,731 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.BOUNDED-6.pals.c [2022-12-14 12:16:49,745 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:16:49,746 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 12:16:49,781 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:16:49,786 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;@7de271ac, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:16:49,786 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 12:16:49,789 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) [2022-12-14 12:16:49,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 12:16:49,794 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:16:49,795 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 12:16:49,795 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:16:49,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:16:49,800 INFO L85 PathProgramCache]: Analyzing trace with hash 1729910615, now seen corresponding path program 1 times [2022-12-14 12:16:49,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:16:49,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828792855] [2022-12-14 12:16:49,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:49,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:16:49,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:50,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:50,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:50,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828792855] [2022-12-14 12:16:50,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828792855] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:16:50,504 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:16:50,504 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:16:50,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132151491] [2022-12-14 12:16:50,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:16:50,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:16:50,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:16:50,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:16:50,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:16:50,539 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) [2022-12-14 12:16:50,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:16:50,601 INFO L93 Difference]: Finished difference Result 36 states and 48 transitions. [2022-12-14 12:16:50,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:16:50,603 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 [2022-12-14 12:16:50,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:16:50,611 INFO L225 Difference]: With dead ends: 36 [2022-12-14 12:16:50,611 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:16:50,614 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 [2022-12-14 12:16:50,617 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 13 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:16:50,618 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:16:50,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:16:50,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2022-12-14 12:16:50,647 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) [2022-12-14 12:16:50,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-12-14 12:16:50,648 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-12-14 12:16:50,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:16:50,649 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-12-14 12:16:50,649 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) [2022-12-14 12:16:50,649 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-12-14 12:16:50,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 12:16:50,650 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:16:50,650 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:16:50,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:16:50,650 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:16:50,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:16:50,651 INFO L85 PathProgramCache]: Analyzing trace with hash -462828712, now seen corresponding path program 1 times [2022-12-14 12:16:50,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:16:50,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800158577] [2022-12-14 12:16:50,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:50,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:16:50,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:50,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:50,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:50,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800158577] [2022-12-14 12:16:50,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800158577] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:16:50,847 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:16:50,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:16:50,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [191081929] [2022-12-14 12:16:50,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:16:50,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:16:50,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:16:50,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:16:50,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:16:50,849 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) [2022-12-14 12:16:50,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:16:50,878 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 12:16:50,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:16:50,878 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 [2022-12-14 12:16:50,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:16:50,879 INFO L225 Difference]: With dead ends: 32 [2022-12-14 12:16:50,879 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:16:50,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:16:50,880 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:16:50,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:16:50,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:16:50,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2022-12-14 12:16:50,883 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) [2022-12-14 12:16:50,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-12-14 12:16:50,883 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2022-12-14 12:16:50,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:16:50,883 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-12-14 12:16:50,883 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) [2022-12-14 12:16:50,883 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-12-14 12:16:50,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 12:16:50,884 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:16:50,884 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:16:50,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 12:16:50,884 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:16:50,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:16:50,884 INFO L85 PathProgramCache]: Analyzing trace with hash -463037249, now seen corresponding path program 1 times [2022-12-14 12:16:50,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:16:50,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597292947] [2022-12-14 12:16:50,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:50,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:16:50,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:51,149 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:51,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:51,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597292947] [2022-12-14 12:16:51,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597292947] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:16:51,150 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:16:51,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 12:16:51,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797354669] [2022-12-14 12:16:51,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:16:51,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:16:51,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:16:51,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:16:51,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:16:51,152 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) [2022-12-14 12:16:51,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:16:51,189 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2022-12-14 12:16:51,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:16:51,190 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 [2022-12-14 12:16:51,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:16:51,191 INFO L225 Difference]: With dead ends: 32 [2022-12-14 12:16:51,191 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 12:16:51,191 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 [2022-12-14 12:16:51,192 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:16:51,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 20 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:16:51,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 12:16:51,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2022-12-14 12:16:51,195 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) [2022-12-14 12:16:51,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-12-14 12:16:51,195 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2022-12-14 12:16:51,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:16:51,195 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-12-14 12:16:51,195 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) [2022-12-14 12:16:51,196 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-12-14 12:16:51,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 12:16:51,196 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:16:51,196 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:16:51,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 12:16:51,196 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:16:51,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:16:51,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1480856736, now seen corresponding path program 1 times [2022-12-14 12:16:51,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:16:51,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841773026] [2022-12-14 12:16:51,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:51,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:16:51,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:51,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:51,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:51,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841773026] [2022-12-14 12:16:51,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841773026] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:16:51,279 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:16:51,279 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 12:16:51,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507260633] [2022-12-14 12:16:51,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:16:51,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 12:16:51,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:16:51,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 12:16:51,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 12:16:51,281 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) [2022-12-14 12:16:51,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:16:51,345 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-12-14 12:16:51,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 12:16:51,345 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 [2022-12-14 12:16:51,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:16:51,345 INFO L225 Difference]: With dead ends: 36 [2022-12-14 12:16:51,345 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 12:16:51,346 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 [2022-12-14 12:16:51,346 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:16:51,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 46 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:16:51,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 12:16:51,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 18. [2022-12-14 12:16:51,350 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) [2022-12-14 12:16:51,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-12-14 12:16:51,350 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2022-12-14 12:16:51,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:16:51,350 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-12-14 12:16:51,350 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) [2022-12-14 12:16:51,350 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-12-14 12:16:51,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 12:16:51,351 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:16:51,351 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:16:51,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 12:16:51,351 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:16:51,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:16:51,351 INFO L85 PathProgramCache]: Analyzing trace with hash -1124144810, now seen corresponding path program 1 times [2022-12-14 12:16:51,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:16:51,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440739369] [2022-12-14 12:16:51,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:51,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:16:51,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:52,531 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:52,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:16:52,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440739369] [2022-12-14 12:16:52,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440739369] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:16:52,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48221448] [2022-12-14 12:16:52,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:16:52,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:16:52,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:16:52,534 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:16:52,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:16:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:16:52,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 12:16:52,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:16:54,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:16:54,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:20:04,893 WARN L233 SmtUtils]: Spent 18.56s on a formula simplification. DAG size of input: 1317 DAG size of output: 1307 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 12:20:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:20:04,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48221448] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:20:04,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826093011] [2022-12-14 12:20:04,913 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 12:20:04,913 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:20:04,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:20:04,919 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:20:04,919 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:22:13,608 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:22:15,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '400#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 0 ~mode1~0) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (<= 0 |ULTIMATE.start_main_~i2~0#1|) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (<= 0 ~mode3~0) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 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|) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (= |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)) (<= |ULTIMATE.start_main_~i2~0#1| 6) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 12:22:15,148 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:22:15,148 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:22:15,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 8] total 17 [2022-12-14 12:22:15,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179840656] [2022-12-14 12:22:15,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:22:15,149 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 12:22:15,149 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:22:15,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 12:22:15,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2022-12-14 12:22:15,152 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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) [2022-12-14 12:22:36,529 WARN L233 SmtUtils]: Spent 21.07s on a formula simplification. DAG size of input: 1375 DAG size of output: 1052 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 12:22:39,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:22:39,995 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2022-12-14 12:22:39,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 12:22:39,996 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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 [2022-12-14 12:22:39,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:22:39,997 INFO L225 Difference]: With dead ends: 72 [2022-12-14 12:22:39,997 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 12:22:39,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 45.8s TimeCoverageRelationStatistics Valid=358, Invalid=1202, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 12:22:39,998 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 92 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 12:22:39,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 61 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 12:22:39,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 12:22:40,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 45. [2022-12-14 12:22:40,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2045454545454546) internal successors, (53), 44 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 12:22:40,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2022-12-14 12:22:40,029 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 14 [2022-12-14 12:22:40,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:22:40,029 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2022-12-14 12:22:40,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 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) [2022-12-14 12:22:40,030 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2022-12-14 12:22:40,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 12:22:40,030 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:22:40,030 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:22:40,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:22:40,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:22:40,233 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:22:40,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:22:40,234 INFO L85 PathProgramCache]: Analyzing trace with hash 1274010007, now seen corresponding path program 1 times [2022-12-14 12:22:40,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:22:40,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991156397] [2022-12-14 12:22:40,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:22:40,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:22:40,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:22:40,509 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:22:40,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:22:40,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991156397] [2022-12-14 12:22:40,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991156397] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:22:40,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18922654] [2022-12-14 12:22:40,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:22:40,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:22:40,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:22:40,511 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:22:40,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:22:40,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:22:40,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 21 conjunts are in the unsatisfiable core [2022-12-14 12:22:40,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:22:40,999 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:22:40,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:22:41,607 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:22:41,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18922654] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:22:41,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592336928] [2022-12-14 12:22:41,610 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 12:22:41,610 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:22:41,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:22:41,610 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:22:41,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:22:47,960 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:22:49,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '707#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 0 ~mode1~0) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= ~st2~0 1) (<= 0 ~id1~0) (<= 0 |ULTIMATE.start_main_~i2~0#1|) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (<= 0 ~mode3~0) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= ~st1~0 1) (<= 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) (<= ~st3~0 1) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (= |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)) (<= |ULTIMATE.start_main_~i2~0#1| 6) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 12:22:49,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:22:49,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:22:49,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 17 [2022-12-14 12:22:49,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184916809] [2022-12-14 12:22:49,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:22:49,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 12:22:49,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:22:49,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 12:22:49,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2022-12-14 12:22:49,445 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 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) [2022-12-14 12:22:49,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:22:49,872 INFO L93 Difference]: Finished difference Result 99 states and 117 transitions. [2022-12-14 12:22:49,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 12:22:49,872 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 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 [2022-12-14 12:22:49,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:22:49,873 INFO L225 Difference]: With dead ends: 99 [2022-12-14 12:22:49,873 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 12:22:49,874 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=330, Invalid=1002, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 12:22:49,874 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 91 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:22:49,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 84 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:22:49,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 12:22:49,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 54. [2022-12-14 12:22:49,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1886792452830188) internal successors, (63), 53 states have internal predecessors, (63), 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) [2022-12-14 12:22:49,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2022-12-14 12:22:49,900 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 16 [2022-12-14 12:22:49,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:22:49,900 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2022-12-14 12:22:49,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 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) [2022-12-14 12:22:49,900 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2022-12-14 12:22:49,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 12:22:49,900 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:22:49,901 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1] [2022-12-14 12:22:49,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-12-14 12:22:50,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:22:50,102 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:22:50,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:22:50,104 INFO L85 PathProgramCache]: Analyzing trace with hash 140249661, now seen corresponding path program 1 times [2022-12-14 12:22:50,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:22:50,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757113841] [2022-12-14 12:22:50,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:22:50,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:22:50,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:22:50,763 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:22:50,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:22:50,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757113841] [2022-12-14 12:22:50,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757113841] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:22:50,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121079482] [2022-12-14 12:22:50,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:22:50,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:22:50,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:22:50,765 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:22:50,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:22:50,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:22:50,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 12:22:50,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:22:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:22:56,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:24:03,102 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:24:03,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121079482] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:24:03,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1726359578] [2022-12-14 12:24:03,103 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 12:24:03,104 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:24:03,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:24:03,104 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:24:03,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:25:14,585 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:25:16,465 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1109#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 0 ~mode1~0) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= ~st2~0 1) (<= 0 ~id1~0) (<= 0 |ULTIMATE.start_main_~i2~0#1|) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (<= 0 ~mode3~0) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= |ULTIMATE.start_init_#res#1| 1) (<= |#NULL.offset| 0) (<= ~mode2~0 1) (<= 0 ~st1~0) (<= 0 ~st2~0) (<= ~p1~0 0) (<= ~mode3~0 1) (<= 0 ~p2~0) (<= 0 ~send2~0) (<= ~r1~0 3) (<= ~id1~0 127) (<= ~st1~0 1) (<= 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) (<= ~st3~0 1) (<= 0 ~id2~0) (<= 0 (+ ~nomsg~0 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~p2~0 0) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= 0 ~st3~0) (<= (+ ~p3_new~0 1) 0) (<= 0 |#NULL.offset|) (= |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) (<= 0 ~p1~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 12:25:16,466 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:25:16,466 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:25:16,466 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 12] total 23 [2022-12-14 12:25:16,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306907369] [2022-12-14 12:25:16,466 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:25:16,466 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 12:25:16,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:25:16,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 12:25:16,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=856, Unknown=0, NotChecked=0, Total=992 [2022-12-14 12:25:16,467 INFO L87 Difference]: Start difference. First operand 54 states and 63 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) [2022-12-14 12:25:39,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:25:39,815 INFO L93 Difference]: Finished difference Result 161 states and 194 transitions. [2022-12-14 12:25:39,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 12:25:39,815 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 [2022-12-14 12:25:39,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:25:39,817 INFO L225 Difference]: With dead ends: 161 [2022-12-14 12:25:39,817 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 12:25:39,818 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1401 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=612, Invalid=3944, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 12:25:39,818 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 223 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:25:39,818 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 190 Invalid, 604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 12:25:39,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 12:25:39,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 109. [2022-12-14 12:25:39,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.1851851851851851) internal successors, (128), 108 states have internal predecessors, (128), 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) [2022-12-14 12:25:39,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 128 transitions. [2022-12-14 12:25:39,866 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 128 transitions. Word has length 24 [2022-12-14 12:25:39,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:25:39,866 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 128 transitions. [2022-12-14 12:25:39,867 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) [2022-12-14 12:25:39,867 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 128 transitions. [2022-12-14 12:25:39,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 12:25:39,867 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:25:39,867 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1] [2022-12-14 12:25:39,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:25:40,068 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 12:25:40,068 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:25:40,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:25:40,069 INFO L85 PathProgramCache]: Analyzing trace with hash -942425476, now seen corresponding path program 2 times [2022-12-14 12:25:40,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:25:40,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068889060] [2022-12-14 12:25:40,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:25:40,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:25:40,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:25:50,284 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:25:50,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:25:50,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068889060] [2022-12-14 12:25:50,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068889060] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:25:50,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780418556] [2022-12-14 12:25:50,285 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:25:50,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:25:50,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:25:50,286 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:25:50,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_617aec4a-ec62-4b93-96a9-4afefe10af8d/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:25:50,630 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 12:25:50,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:25:50,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 12:25:50,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:25:57,104 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:25:57,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:27:09,648 WARN L233 SmtUtils]: Spent 6.11s on a formula simplification. DAG size of input: 639 DAG size of output: 628 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)