./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta --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 173419c809fa8cb7fa094fdfc7b5765802a9a2fdebfe9d0a53cd745fd0c573d2 --- 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-dbf71c6-m [2022-10-17 17:23:42,131 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:23:42,133 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:23:42,173 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:23:42,174 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:23:42,178 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:23:42,181 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:23:42,190 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:23:42,192 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:23:42,193 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:23:42,194 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:23:42,196 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:23:42,196 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:23:42,198 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:23:42,199 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:23:42,201 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:23:42,202 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:23:42,203 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:23:42,205 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:23:42,207 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:23:42,209 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:23:42,211 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:23:42,212 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:23:42,213 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:23:42,218 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:23:42,218 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:23:42,219 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:23:42,220 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:23:42,221 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:23:42,222 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:23:42,222 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:23:42,223 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:23:42,224 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:23:42,225 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:23:42,226 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:23:42,227 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:23:42,228 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:23:42,228 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:23:42,228 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:23:42,229 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:23:42,230 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:23:42,231 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:23:42,271 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:23:42,272 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:23:42,272 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:23:42,272 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:23:42,273 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:23:42,273 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:23:42,274 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:23:42,274 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:23:42,274 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:23:42,275 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:23:42,275 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:23:42,275 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:23:42,275 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:23:42,275 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:23:42,276 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:23:42,276 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:23:42,276 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:23:42,276 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:23:42,277 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:23:42,278 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:23:42,278 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:23:42,278 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:23:42,278 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:23:42,279 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:23:42,279 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:23:42,279 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:23:42,279 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:23:42,279 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:23:42,280 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:23:42,280 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:23:42,280 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:23:42,288 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:23:42,288 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:23:42,289 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:23:42,289 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:23:42,289 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:23:42,289 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:23:42,289 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:23:42,290 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:23:42,290 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:23:42,290 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:23:42,290 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_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 173419c809fa8cb7fa094fdfc7b5765802a9a2fdebfe9d0a53cd745fd0c573d2 [2022-10-17 17:23:42,535 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:23:42,567 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:23:42,570 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:23:42,571 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:23:42,572 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:23:42,573 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2022-10-17 17:23:42,657 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/data/8fc974ea0/393f8f7157f64937bb34cd52a04ef4bd/FLAG5ed485235 [2022-10-17 17:23:43,075 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:23:43,076 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2022-10-17 17:23:43,085 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/data/8fc974ea0/393f8f7157f64937bb34cd52a04ef4bd/FLAG5ed485235 [2022-10-17 17:23:43,462 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/data/8fc974ea0/393f8f7157f64937bb34cd52a04ef4bd [2022-10-17 17:23:43,465 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:23:43,466 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:23:43,471 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:23:43,471 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:23:43,475 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:23:43,475 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,476 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7efeb1a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43, skipping insertion in model container [2022-10-17 17:23:43,477 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,484 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:23:43,499 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:23:43,682 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c[588,601] [2022-10-17 17:23:43,705 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:23:43,714 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:23:43,727 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound5.c[588,601] [2022-10-17 17:23:43,738 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:23:43,751 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:23:43,751 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43 WrapperNode [2022-10-17 17:23:43,751 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:23:43,753 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:23:43,753 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:23:43,753 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:23:43,760 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,767 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,786 INFO L138 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 49 [2022-10-17 17:23:43,786 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:23:43,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:23:43,787 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:23:43,787 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:23:43,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,796 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,811 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,822 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,823 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,825 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:23:43,826 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:23:43,827 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:23:43,827 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:23:43,828 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (1/1) ... [2022-10-17 17:23:43,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:23:43,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:43,859 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:23:43,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:23:43,911 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:23:43,912 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:23:43,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:23:43,912 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:23:43,912 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-10-17 17:23:43,912 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-10-17 17:23:43,975 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:23:43,977 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:23:44,142 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:23:44,159 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:23:44,160 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-10-17 17:23:44,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:23:44 BoogieIcfgContainer [2022-10-17 17:23:44,162 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:23:44,165 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:23:44,166 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:23:44,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:23:44,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:23:43" (1/3) ... [2022-10-17 17:23:44,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dce7c69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:23:44, skipping insertion in model container [2022-10-17 17:23:44,172 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:23:43" (2/3) ... [2022-10-17 17:23:44,173 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4dce7c69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:23:44, skipping insertion in model container [2022-10-17 17:23:44,173 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:23:44" (3/3) ... [2022-10-17 17:23:44,175 INFO L112 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound5.c [2022-10-17 17:23:44,196 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:23:44,196 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-10-17 17:23:44,275 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:23:44,283 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;@1cd88d92, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:23:44,283 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-10-17 17:23:44,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-10-17 17:23:44,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-10-17 17:23:44,294 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:44,295 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-10-17 17:23:44,296 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:44,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:44,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1408153759, now seen corresponding path program 1 times [2022-10-17 17:23:44,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:44,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149566830] [2022-10-17 17:23:44,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:44,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:44,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:44,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:23:44,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:44,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149566830] [2022-10-17 17:23:44,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149566830] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:44,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:44,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-10-17 17:23:44,455 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548040421] [2022-10-17 17:23:44,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:44,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-10-17 17:23:44,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:44,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-10-17 17:23:44,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-17 17:23:44,490 INFO L87 Difference]: Start difference. First operand has 23 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:44,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:44,520 INFO L93 Difference]: Finished difference Result 45 states and 82 transitions. [2022-10-17 17:23:44,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-10-17 17:23:44,523 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-10-17 17:23:44,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:44,530 INFO L225 Difference]: With dead ends: 45 [2022-10-17 17:23:44,531 INFO L226 Difference]: Without dead ends: 21 [2022-10-17 17:23:44,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-10-17 17:23:44,538 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:44,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:23:44,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-10-17 17:23:44,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-10-17 17:23:44,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:23:44,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 32 transitions. [2022-10-17 17:23:44,580 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 32 transitions. Word has length 6 [2022-10-17 17:23:44,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:44,580 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 32 transitions. [2022-10-17 17:23:44,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:44,581 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 32 transitions. [2022-10-17 17:23:44,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:23:44,582 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:44,582 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:44,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:23:44,583 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:44,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:44,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1232571916, now seen corresponding path program 1 times [2022-10-17 17:23:44,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:44,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837158441] [2022-10-17 17:23:44,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:44,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:44,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:44,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:23:44,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:44,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837158441] [2022-10-17 17:23:44,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837158441] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:44,712 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:44,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:23:44,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925300399] [2022-10-17 17:23:44,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:44,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:23:44,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:44,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:23:44,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:23:44,715 INFO L87 Difference]: Start difference. First operand 21 states and 32 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:44,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:44,740 INFO L93 Difference]: Finished difference Result 35 states and 51 transitions. [2022-10-17 17:23:44,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:23:44,741 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-10-17 17:23:44,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:44,742 INFO L225 Difference]: With dead ends: 35 [2022-10-17 17:23:44,743 INFO L226 Difference]: Without dead ends: 23 [2022-10-17 17:23:44,744 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:23:44,745 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 0 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:44,763 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 86 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-10-17 17:23:44,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-10-17 17:23:44,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-10-17 17:23:44,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:23:44,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 34 transitions. [2022-10-17 17:23:44,773 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 34 transitions. Word has length 7 [2022-10-17 17:23:44,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:44,773 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 34 transitions. [2022-10-17 17:23:44,774 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:44,774 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 34 transitions. [2022-10-17 17:23:44,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-10-17 17:23:44,775 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:44,775 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:44,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:23:44,776 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:44,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:44,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1231022784, now seen corresponding path program 1 times [2022-10-17 17:23:44,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:44,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478706209] [2022-10-17 17:23:44,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:44,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:44,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:44,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:23:44,985 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:44,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478706209] [2022-10-17 17:23:44,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478706209] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:44,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:44,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:23:44,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451196338] [2022-10-17 17:23:44,987 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:44,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:23:44,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:44,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:23:44,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:23:44,989 INFO L87 Difference]: Start difference. First operand 23 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:45,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:45,129 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2022-10-17 17:23:45,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:23:45,130 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-10-17 17:23:45,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:45,131 INFO L225 Difference]: With dead ends: 29 [2022-10-17 17:23:45,131 INFO L226 Difference]: Without dead ends: 27 [2022-10-17 17:23:45,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:23:45,133 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 8 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:45,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 55 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:23:45,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-10-17 17:23:45,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-10-17 17:23:45,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-10-17 17:23:45,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2022-10-17 17:23:45,148 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 7 [2022-10-17 17:23:45,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:45,149 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2022-10-17 17:23:45,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-10-17 17:23:45,149 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2022-10-17 17:23:45,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-10-17 17:23:45,150 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:45,150 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:45,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:23:45,151 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:45,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:45,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1004679035, now seen corresponding path program 1 times [2022-10-17 17:23:45,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:45,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508635462] [2022-10-17 17:23:45,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:45,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:45,167 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:23:45,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1259840688] [2022-10-17 17:23:45,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:45,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:45,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:45,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:23:45,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:23:45,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:45,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:23:45,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:23:45,367 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:23:45,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:23:45,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:45,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508635462] [2022-10-17 17:23:45,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:23:45,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259840688] [2022-10-17 17:23:45,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259840688] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:45,369 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:45,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:23:45,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704790401] [2022-10-17 17:23:45,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:45,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:23:45,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:45,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:23:45,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:23:45,371 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:23:45,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:45,497 INFO L93 Difference]: Finished difference Result 45 states and 65 transitions. [2022-10-17 17:23:45,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:23:45,497 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-10-17 17:23:45,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:45,499 INFO L225 Difference]: With dead ends: 45 [2022-10-17 17:23:45,499 INFO L226 Difference]: Without dead ends: 43 [2022-10-17 17:23:45,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:23:45,501 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:45,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 114 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:23:45,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-10-17 17:23:45,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2022-10-17 17:23:45,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-10-17 17:23:45,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2022-10-17 17:23:45,517 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2022-10-17 17:23:45,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:45,518 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2022-10-17 17:23:45,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-10-17 17:23:45,519 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2022-10-17 17:23:45,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-10-17 17:23:45,519 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:45,520 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:45,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:23:45,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:45,745 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:45,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:45,746 INFO L85 PathProgramCache]: Analyzing trace with hash 752381984, now seen corresponding path program 1 times [2022-10-17 17:23:45,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:45,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069531669] [2022-10-17 17:23:45,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:45,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:45,764 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:23:45,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [446312697] [2022-10-17 17:23:45,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:45,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:45,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:45,779 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:23:45,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:23:45,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:45,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2022-10-17 17:23:45,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:23:45,917 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 17:23:45,917 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:23:45,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:45,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069531669] [2022-10-17 17:23:45,918 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:23:45,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446312697] [2022-10-17 17:23:45,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446312697] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:45,919 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:45,919 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:23:45,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083958208] [2022-10-17 17:23:45,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:45,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:23:45,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:45,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:23:45,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:23:45,921 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:23:46,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:46,022 INFO L93 Difference]: Finished difference Result 49 states and 68 transitions. [2022-10-17 17:23:46,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:23:46,023 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-10-17 17:23:46,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:46,027 INFO L225 Difference]: With dead ends: 49 [2022-10-17 17:23:46,027 INFO L226 Difference]: Without dead ends: 47 [2022-10-17 17:23:46,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:23:46,030 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:46,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 120 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:23:46,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-10-17 17:23:46,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-10-17 17:23:46,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-10-17 17:23:46,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 59 transitions. [2022-10-17 17:23:46,058 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 59 transitions. Word has length 17 [2022-10-17 17:23:46,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:46,059 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 59 transitions. [2022-10-17 17:23:46,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-10-17 17:23:46,059 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 59 transitions. [2022-10-17 17:23:46,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-10-17 17:23:46,060 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:46,060 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:46,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:23:46,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:46,261 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:46,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:46,262 INFO L85 PathProgramCache]: Analyzing trace with hash -2088406747, now seen corresponding path program 1 times [2022-10-17 17:23:46,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:46,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742562768] [2022-10-17 17:23:46,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:46,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:46,277 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:23:46,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1149083048] [2022-10-17 17:23:46,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:46,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:46,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:46,289 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:23:46,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:23:46,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:46,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core [2022-10-17 17:23:46,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:23:46,494 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-10-17 17:23:46,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:23:46,495 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:46,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742562768] [2022-10-17 17:23:46,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:23:46,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149083048] [2022-10-17 17:23:46,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149083048] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:23:46,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:23:46,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:23:46,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097900309] [2022-10-17 17:23:46,497 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:23:46,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:23:46,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:46,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:23:46,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:23:46,498 INFO L87 Difference]: Start difference. First operand 43 states and 59 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-10-17 17:23:46,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:46,627 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-10-17 17:23:46,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-10-17 17:23:46,628 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2022-10-17 17:23:46,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:46,631 INFO L225 Difference]: With dead ends: 57 [2022-10-17 17:23:46,633 INFO L226 Difference]: Without dead ends: 45 [2022-10-17 17:23:46,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:23:46,636 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 6 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:46,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 103 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:23:46,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-10-17 17:23:46,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-10-17 17:23:46,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 24 states have internal predecessors, (26), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-10-17 17:23:46,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 57 transitions. [2022-10-17 17:23:46,657 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 57 transitions. Word has length 22 [2022-10-17 17:23:46,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:46,658 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 57 transitions. [2022-10-17 17:23:46,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-10-17 17:23:46,658 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 57 transitions. [2022-10-17 17:23:46,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-10-17 17:23:46,659 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:46,660 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:46,699 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-10-17 17:23:46,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:46,885 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:46,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:46,886 INFO L85 PathProgramCache]: Analyzing trace with hash 204620983, now seen corresponding path program 1 times [2022-10-17 17:23:46,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:46,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328325195] [2022-10-17 17:23:46,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:46,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:46,913 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:23:46,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [877091536] [2022-10-17 17:23:46,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:46,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:46,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:46,918 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:23:46,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-10-17 17:23:46,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:46,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2022-10-17 17:23:46,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:23:47,047 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-10-17 17:23:47,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:23:47,102 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:23:47,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:47,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328325195] [2022-10-17 17:23:47,103 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:23:47,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877091536] [2022-10-17 17:23:47,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877091536] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:23:47,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1586296425] [2022-10-17 17:23:47,122 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-10-17 17:23:47,122 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:23:47,126 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:23:47,131 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:23:47,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:23:51,676 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2022-10-17 17:23:51,721 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:23:54,615 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1154#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-10-17 17:23:54,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:23:54,616 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:23:54,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-10-17 17:23:54,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582464121] [2022-10-17 17:23:54,616 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:23:54,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:23:54,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:54,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:23:54,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2022-10-17 17:23:54,619 INFO L87 Difference]: Start difference. First operand 45 states and 57 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-10-17 17:23:54,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:23:54,854 INFO L93 Difference]: Finished difference Result 115 states and 150 transitions. [2022-10-17 17:23:54,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-10-17 17:23:54,855 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 40 [2022-10-17 17:23:54,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:23:54,857 INFO L225 Difference]: With dead ends: 115 [2022-10-17 17:23:54,857 INFO L226 Difference]: Without dead ends: 99 [2022-10-17 17:23:54,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-10-17 17:23:54,859 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 63 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:23:54,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 168 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:23:54,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-10-17 17:23:54,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2022-10-17 17:23:54,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 49 states have internal predecessors, (53), 38 states have call successors, (38), 10 states have call predecessors, (38), 10 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:23:54,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 126 transitions. [2022-10-17 17:23:54,894 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 126 transitions. Word has length 40 [2022-10-17 17:23:54,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:23:54,895 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 126 transitions. [2022-10-17 17:23:54,895 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-10-17 17:23:54,895 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 126 transitions. [2022-10-17 17:23:54,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-10-17 17:23:54,896 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:23:54,897 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:23:54,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-10-17 17:23:55,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:55,121 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:23:55,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:23:55,122 INFO L85 PathProgramCache]: Analyzing trace with hash 696736299, now seen corresponding path program 1 times [2022-10-17 17:23:55,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:23:55,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665257869] [2022-10-17 17:23:55,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:55,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:23:55,135 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:23:55,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1819595972] [2022-10-17 17:23:55,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:23:55,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:23:55,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:23:55,137 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:23:55,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-10-17 17:23:55,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:23:55,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:23:55,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:23:55,340 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:23:55,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:23:55,422 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-10-17 17:23:55,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:23:55,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665257869] [2022-10-17 17:23:55,423 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:23:55,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819595972] [2022-10-17 17:23:55,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819595972] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:23:55,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1698458358] [2022-10-17 17:23:55,426 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:23:55,426 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:23:55,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:23:55,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:23:55,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:23:59,050 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-10-17 17:23:59,055 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:23:59,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1740#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:23:59,680 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:23:59,681 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:23:59,681 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-10-17 17:23:59,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074020877] [2022-10-17 17:23:59,681 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:23:59,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:23:59,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:23:59,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:23:59,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:23:59,683 INFO L87 Difference]: Start difference. First operand 95 states and 126 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-10-17 17:24:00,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:24:00,015 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2022-10-17 17:24:00,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:24:00,016 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 40 [2022-10-17 17:24:00,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:24:00,018 INFO L225 Difference]: With dead ends: 113 [2022-10-17 17:24:00,018 INFO L226 Difference]: Without dead ends: 111 [2022-10-17 17:24:00,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2022-10-17 17:24:00,020 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:24:00,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 88 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:24:00,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-10-17 17:24:00,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-10-17 17:24:00,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 61 states have internal predecessors, (65), 38 states have call successors, (38), 14 states have call predecessors, (38), 14 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:24:00,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 138 transitions. [2022-10-17 17:24:00,054 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 138 transitions. Word has length 40 [2022-10-17 17:24:00,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:24:00,055 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 138 transitions. [2022-10-17 17:24:00,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-10-17 17:24:00,055 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 138 transitions. [2022-10-17 17:24:00,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-10-17 17:24:00,056 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:24:00,056 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:24:00,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-10-17 17:24:00,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:24:00,281 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:24:00,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:24:00,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1539244486, now seen corresponding path program 2 times [2022-10-17 17:24:00,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:24:00,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634437519] [2022-10-17 17:24:00,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:24:00,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:24:00,292 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:24:00,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [170007569] [2022-10-17 17:24:00,292 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-10-17 17:24:00,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:24:00,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:24:00,293 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:24:00,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-10-17 17:24:00,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-10-17 17:24:00,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:24:00,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:24:00,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:24:00,444 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-10-17 17:24:00,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:24:00,531 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-10-17 17:24:00,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:24:00,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634437519] [2022-10-17 17:24:00,531 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:24:00,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170007569] [2022-10-17 17:24:00,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170007569] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:24:00,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1376875189] [2022-10-17 17:24:00,535 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:24:00,535 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:24:00,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:24:00,536 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:24:00,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:24:03,441 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2022-10-17 17:24:03,483 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:24:07,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2368#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:24:07,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:24:07,841 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:24:07,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-10-17 17:24:07,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073490985] [2022-10-17 17:24:07,841 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:24:07,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:24:07,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:24:07,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:24:07,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:24:07,843 INFO L87 Difference]: Start difference. First operand 111 states and 138 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-10-17 17:24:08,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:24:08,015 INFO L93 Difference]: Finished difference Result 117 states and 143 transitions. [2022-10-17 17:24:08,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:24:08,015 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 45 [2022-10-17 17:24:08,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:24:08,017 INFO L225 Difference]: With dead ends: 117 [2022-10-17 17:24:08,018 INFO L226 Difference]: Without dead ends: 115 [2022-10-17 17:24:08,018 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2022-10-17 17:24:08,019 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 7 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:24:08,019 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 157 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:24:08,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-10-17 17:24:08,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-10-17 17:24:08,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 64 states have internal predecessors, (68), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2022-10-17 17:24:08,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 141 transitions. [2022-10-17 17:24:08,047 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 141 transitions. Word has length 45 [2022-10-17 17:24:08,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:24:08,048 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 141 transitions. [2022-10-17 17:24:08,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2022-10-17 17:24:08,048 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 141 transitions. [2022-10-17 17:24:08,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-10-17 17:24:08,049 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:24:08,050 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:24:08,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-10-17 17:24:08,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-10-17 17:24:08,269 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:24:08,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:24:08,270 INFO L85 PathProgramCache]: Analyzing trace with hash -375151797, now seen corresponding path program 3 times [2022-10-17 17:24:08,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:24:08,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029699556] [2022-10-17 17:24:08,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:24:08,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:24:08,280 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:24:08,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [834152008] [2022-10-17 17:24:08,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-10-17 17:24:08,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:24:08,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:24:08,297 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:24:08,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-10-17 17:24:08,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-10-17 17:24:08,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-10-17 17:24:08,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 19 conjunts are in the unsatisfiable core [2022-10-17 17:24:08,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:24:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-10-17 17:24:08,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:24:08,624 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-10-17 17:24:08,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:24:08,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029699556] [2022-10-17 17:24:08,625 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:24:08,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834152008] [2022-10-17 17:24:08,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834152008] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:24:08,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1552306756] [2022-10-17 17:24:08,627 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-10-17 17:24:08,627 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:24:08,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:24:08,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:24:08,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:24:12,192 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 20 for LOIs [2022-10-17 17:24:12,203 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:24:13,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3032#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-10-17 17:24:13,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:24:13,165 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-10-17 17:24:13,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2022-10-17 17:24:13,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980070492] [2022-10-17 17:24:13,165 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-10-17 17:24:13,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:24:13,166 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:24:13,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:24:13,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:24:13,167 INFO L87 Difference]: Start difference. First operand 115 states and 141 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-10-17 17:24:13,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:24:13,502 INFO L93 Difference]: Finished difference Result 141 states and 163 transitions. [2022-10-17 17:24:13,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:24:13,503 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 50 [2022-10-17 17:24:13,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:24:13,505 INFO L225 Difference]: With dead ends: 141 [2022-10-17 17:24:13,505 INFO L226 Difference]: Without dead ends: 130 [2022-10-17 17:24:13,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2022-10-17 17:24:13,506 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 11 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:24:13,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 92 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 17:24:13,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-10-17 17:24:13,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2022-10-17 17:24:13,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 79 states have (on average 1.0886075949367089) internal successors, (86), 82 states have internal predecessors, (86), 29 states have call successors, (29), 21 states have call predecessors, (29), 21 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2022-10-17 17:24:13,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 141 transitions. [2022-10-17 17:24:13,537 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 141 transitions. Word has length 50 [2022-10-17 17:24:13,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:24:13,538 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 141 transitions. [2022-10-17 17:24:13,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) [2022-10-17 17:24:13,538 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 141 transitions. [2022-10-17 17:24:13,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-10-17 17:24:13,539 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:24:13,540 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:24:13,565 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-10-17 17:24:13,753 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-10-17 17:24:13,753 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:24:13,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:24:13,754 INFO L85 PathProgramCache]: Analyzing trace with hash 780075682, now seen corresponding path program 1 times [2022-10-17 17:24:13,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:24:13,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244754865] [2022-10-17 17:24:13,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:24:13,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:24:13,773 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-10-17 17:24:13,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1051805693] [2022-10-17 17:24:13,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:24:13,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:24:13,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:24:13,779 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:24:13,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8225278c-bdca-4aef-bd3b-2e91d820bec9/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-10-17 17:24:13,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:24:13,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 18 conjunts are in the unsatisfiable core [2022-10-17 17:24:13,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:24:14,028 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 22 proven. 8 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-10-17 17:24:14,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:24:14,200 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:24:14,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244754865] [2022-10-17 17:24:14,201 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-10-17 17:24:14,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051805693] [2022-10-17 17:24:14,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051805693] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:24:14,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [788838712] [2022-10-17 17:24:14,203 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-10-17 17:24:14,204 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:24:14,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:24:14,204 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:24:14,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs