./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS --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 a367fffaabe322cc88315ee22f1c9c69606de0332ddd62ff36608ec1e5019dc8 --- 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-8393723 [2022-11-19 06:41:23,216 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:41:23,219 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:41:23,254 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:41:23,257 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:41:23,261 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:41:23,264 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:41:23,267 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:41:23,270 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:41:23,275 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:41:23,277 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:41:23,279 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:41:23,279 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:41:23,282 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:41:23,283 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:41:23,286 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:41:23,288 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:41:23,289 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:41:23,290 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:41:23,297 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:41:23,298 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:41:23,299 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:41:23,302 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:41:23,303 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:41:23,311 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:41:23,311 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:41:23,312 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:41:23,314 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:41:23,314 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:41:23,315 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:41:23,315 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:41:23,317 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:41:23,319 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:41:23,321 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:41:23,323 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:41:23,323 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:41:23,323 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:41:23,323 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:41:23,324 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:41:23,324 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:41:23,325 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:41:23,326 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:41:23,363 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:41:23,364 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:41:23,364 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:41:23,364 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:41:23,366 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:41:23,366 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:41:23,366 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:41:23,366 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:41:23,366 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:41:23,367 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:41:23,368 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:41:23,368 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:41:23,368 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:41:23,368 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:41:23,368 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:41:23,369 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:41:23,369 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:41:23,369 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:41:23,370 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:41:23,370 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:41:23,370 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:41:23,370 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:41:23,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:41:23,371 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:41:23,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:41:23,371 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:41:23,371 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:41:23,373 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:41:23,373 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:41:23,373 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:41:23,373 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:41:23,374 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:41:23,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:41:23,374 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:41:23,374 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:41:23,374 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:41:23,374 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:41:23,375 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:41:23,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:41:23,375 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:41:23,375 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:41:23,375 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_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a367fffaabe322cc88315ee22f1c9c69606de0332ddd62ff36608ec1e5019dc8 [2022-11-19 06:41:23,712 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:41:23,736 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:41:23,740 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:41:23,741 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:41:23,742 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:41:23,743 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c [2022-11-19 06:41:23,813 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/data/d94ff0fc7/51015fcc5c0845e3adebd8c297f12d3b/FLAGc0086166e [2022-11-19 06:41:24,342 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:41:24,343 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c [2022-11-19 06:41:24,349 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/data/d94ff0fc7/51015fcc5c0845e3adebd8c297f12d3b/FLAGc0086166e [2022-11-19 06:41:24,699 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/data/d94ff0fc7/51015fcc5c0845e3adebd8c297f12d3b [2022-11-19 06:41:24,704 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:41:24,706 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:41:24,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:41:24,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:41:24,716 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:41:24,717 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:41:24" (1/1) ... [2022-11-19 06:41:24,719 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ec3de0e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:24, skipping insertion in model container [2022-11-19 06:41:24,719 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:41:24" (1/1) ... [2022-11-19 06:41:24,727 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:41:24,746 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:41:24,941 WARN L234 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_19aa3c36-438c-49c6-8cb9-118d7448d3e1/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c[524,537] [2022-11-19 06:41:24,959 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:41:24,967 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:41:24,980 WARN L234 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_19aa3c36-438c-49c6-8cb9-118d7448d3e1/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound50.c[524,537] [2022-11-19 06:41:24,987 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:41:25,000 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:41:25,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25 WrapperNode [2022-11-19 06:41:25,001 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:41:25,002 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:41:25,002 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:41:25,002 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:41:25,009 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,016 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,032 INFO L138 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2022-11-19 06:41:25,033 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:41:25,034 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:41:25,034 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:41:25,034 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:41:25,043 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,043 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,044 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,045 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,048 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,051 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,052 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,053 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,055 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:41:25,056 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:41:25,056 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:41:25,056 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:41:25,057 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (1/1) ... [2022-11-19 06:41:25,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:41:25,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:25,098 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:41:25,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:41:25,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:41:25,143 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-19 06:41:25,144 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-19 06:41:25,144 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:41:25,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:41:25,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:41:25,144 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 06:41:25,144 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 06:41:25,213 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:41:25,215 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:41:25,424 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:41:25,508 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:41:25,509 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-19 06:41:25,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:41:25 BoogieIcfgContainer [2022-11-19 06:41:25,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:41:25,513 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:41:25,513 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:41:25,530 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:41:25,530 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:41:24" (1/3) ... [2022-11-19 06:41:25,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bfe7363 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:41:25, skipping insertion in model container [2022-11-19 06:41:25,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:41:25" (2/3) ... [2022-11-19 06:41:25,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bfe7363 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:41:25, skipping insertion in model container [2022-11-19 06:41:25,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:41:25" (3/3) ... [2022-11-19 06:41:25,532 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat2-ll_unwindbound50.c [2022-11-19 06:41:25,564 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:41:25,564 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:41:25,640 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:41:25,649 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;@64184e1e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:41:25,650 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:41:25,654 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 06:41:25,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-19 06:41:25,663 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:25,663 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:25,666 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:25,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:25,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1046920148, now seen corresponding path program 1 times [2022-11-19 06:41:25,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:25,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919976134] [2022-11-19 06:41:25,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:25,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:25,818 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:25,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [893231100] [2022-11-19 06:41:25,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:25,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:25,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:25,824 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:25,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:41:25,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:25,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-19 06:41:25,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:25,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:25,971 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:41:25,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:25,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919976134] [2022-11-19 06:41:25,973 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:25,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893231100] [2022-11-19 06:41:25,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893231100] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:41:25,975 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:41:25,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 06:41:25,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252182187] [2022-11-19 06:41:25,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:41:25,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 06:41:25,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:26,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 06:41:26,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:41:26,029 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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) [2022-11-19 06:41:26,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:26,074 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2022-11-19 06:41:26,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 06:41:26,077 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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 13 [2022-11-19 06:41:26,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:26,093 INFO L225 Difference]: With dead ends: 32 [2022-11-19 06:41:26,093 INFO L226 Difference]: Without dead ends: 17 [2022-11-19 06:41:26,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 06:41:26,101 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:26,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:41:26,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-11-19 06:41:26,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-11-19 06:41:26,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:41:26,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-11-19 06:41:26,147 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2022-11-19 06:41:26,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:26,149 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-11-19 06:41:26,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 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) [2022-11-19 06:41:26,150 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-11-19 06:41:26,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:41:26,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:26,152 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:26,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:26,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 06:41:26,359 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:26,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:26,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1317434454, now seen corresponding path program 1 times [2022-11-19 06:41:26,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:26,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237660837] [2022-11-19 06:41:26,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:26,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:26,381 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:26,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1552798628] [2022-11-19 06:41:26,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:26,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:26,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:26,397 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:26,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:41:26,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:26,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 06:41:26,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:26,591 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:26,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:41:26,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:26,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237660837] [2022-11-19 06:41:26,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:26,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552798628] [2022-11-19 06:41:26,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552798628] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:41:26,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:41:26,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 06:41:26,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287547181] [2022-11-19 06:41:26,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:41:26,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 06:41:26,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:26,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 06:41:26,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:41:26,603 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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) [2022-11-19 06:41:26,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:26,639 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2022-11-19 06:41:26,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 06:41:26,640 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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 14 [2022-11-19 06:41:26,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:26,641 INFO L225 Difference]: With dead ends: 26 [2022-11-19 06:41:26,641 INFO L226 Difference]: Without dead ends: 19 [2022-11-19 06:41:26,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 06:41:26,645 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:26,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:41:26,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-11-19 06:41:26,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-11-19 06:41:26,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:41:26,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-11-19 06:41:26,659 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 14 [2022-11-19 06:41:26,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:26,660 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-11-19 06:41:26,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 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) [2022-11-19 06:41:26,660 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-11-19 06:41:26,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 06:41:26,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:26,661 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:26,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:26,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:26,867 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:26,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:26,867 INFO L85 PathProgramCache]: Analyzing trace with hash 1319221914, now seen corresponding path program 1 times [2022-11-19 06:41:26,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:26,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023124398] [2022-11-19 06:41:26,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:26,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:26,890 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:26,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [641308370] [2022-11-19 06:41:26,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:26,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:26,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:26,893 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:26,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:41:26,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:26,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-19 06:41:26,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:27,134 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:27,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 06:41:27,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:27,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023124398] [2022-11-19 06:41:27,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:27,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641308370] [2022-11-19 06:41:27,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641308370] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:41:27,136 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:41:27,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:41:27,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84759368] [2022-11-19 06:41:27,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:41:27,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:41:27,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:27,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:41:27,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:41:27,139 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 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) [2022-11-19 06:41:27,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:27,368 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-11-19 06:41:27,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:41:27,371 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 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 14 [2022-11-19 06:41:27,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:27,373 INFO L225 Difference]: With dead ends: 28 [2022-11-19 06:41:27,373 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 06:41:27,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:41:27,376 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:27,378 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 47 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:41:27,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 06:41:27,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-11-19 06:41:27,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.2) internal successors, (18), 17 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 06:41:27,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2022-11-19 06:41:27,388 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 14 [2022-11-19 06:41:27,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:27,389 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2022-11-19 06:41:27,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 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) [2022-11-19 06:41:27,389 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2022-11-19 06:41:27,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 06:41:27,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:27,390 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:27,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 06:41:27,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-19 06:41:27,596 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:27,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:27,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1562521278, now seen corresponding path program 1 times [2022-11-19 06:41:27,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:27,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012249639] [2022-11-19 06:41:27,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:27,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:27,610 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:27,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1787729027] [2022-11-19 06:41:27,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:27,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:27,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:27,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:27,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:41:27,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:27,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:41:27,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:27,831 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:27,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:28,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:28,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:28,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012249639] [2022-11-19 06:41:28,008 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:28,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787729027] [2022-11-19 06:41:28,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787729027] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:28,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1357145558] [2022-11-19 06:41:28,040 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:28,040 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:28,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:28,055 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:28,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:41:28,619 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-19 06:41:28,634 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:41:28,705 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:41:34,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1357145558] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:41:34,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:41:34,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 7] total 22 [2022-11-19 06:41:34,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882024985] [2022-11-19 06:41:34,363 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:41:34,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 06:41:34,364 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:34,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 06:41:34,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:41:34,365 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:41:34,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:34,732 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2022-11-19 06:41:34,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 06:41:34,732 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-19 06:41:34,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:34,733 INFO L225 Difference]: With dead ends: 32 [2022-11-19 06:41:34,733 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 06:41:34,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2022-11-19 06:41:34,735 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:34,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 46 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 17 Unchecked, 0.3s Time] [2022-11-19 06:41:34,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 06:41:34,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 06:41:34,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 06:41:34,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2022-11-19 06:41:34,746 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 20 [2022-11-19 06:41:34,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:34,746 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2022-11-19 06:41:34,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-19 06:41:34,746 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2022-11-19 06:41:34,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 06:41:34,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:34,748 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:34,757 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-19 06:41:34,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:34,953 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:34,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:34,953 INFO L85 PathProgramCache]: Analyzing trace with hash -182192907, now seen corresponding path program 1 times [2022-11-19 06:41:34,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:34,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504182890] [2022-11-19 06:41:34,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:34,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:34,977 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:34,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1193733767] [2022-11-19 06:41:34,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:34,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:34,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:34,985 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:34,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:41:35,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:35,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-19 06:41:35,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:35,095 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:35,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:35,138 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:35,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:35,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504182890] [2022-11-19 06:41:35,138 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:35,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193733767] [2022-11-19 06:41:35,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193733767] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:35,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463923569] [2022-11-19 06:41:35,141 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:35,142 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:35,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:35,142 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:35,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:41:36,043 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-19 06:41:36,147 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:41:36,184 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:41:37,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '703#(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 [2022-11-19 06:41:37,932 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:41:37,932 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:41:37,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-19 06:41:37,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348075775] [2022-11-19 06:41:37,933 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:37,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 06:41:37,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:37,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 06:41:37,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2022-11-19 06:41:37,934 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-19 06:41:38,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:38,051 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2022-11-19 06:41:38,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 06:41:38,052 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 22 [2022-11-19 06:41:38,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:38,053 INFO L225 Difference]: With dead ends: 56 [2022-11-19 06:41:38,053 INFO L226 Difference]: Without dead ends: 49 [2022-11-19 06:41:38,053 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2022-11-19 06:41:38,054 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 26 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:38,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 64 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:41:38,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-19 06:41:38,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2022-11-19 06:41:38,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 06:41:38,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2022-11-19 06:41:38,067 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 22 [2022-11-19 06:41:38,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:38,067 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2022-11-19 06:41:38,068 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-19 06:41:38,068 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2022-11-19 06:41:38,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 06:41:38,068 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:38,069 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:38,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:38,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:38,275 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:38,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:38,276 INFO L85 PathProgramCache]: Analyzing trace with hash -180405447, now seen corresponding path program 1 times [2022-11-19 06:41:38,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:38,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443528339] [2022-11-19 06:41:38,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:38,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:38,284 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:41:38,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [577346229] [2022-11-19 06:41:38,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:38,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:38,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:38,295 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:38,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:41:38,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:38,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 06:41:38,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 06:41:43,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:49,482 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:41:49,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:49,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443528339] [2022-11-19 06:41:49,483 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:41:49,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577346229] [2022-11-19 06:41:49,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577346229] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:49,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901051838] [2022-11-19 06:41:49,485 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-19 06:41:49,486 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:49,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:41:49,486 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:41:49,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:41:50,081 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-19 06:41:50,119 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:41:50,154 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:41:52,534 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1002#(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 [2022-11-19 06:41:52,534 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:41:52,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:41:52,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 13 [2022-11-19 06:41:52,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188643642] [2022-11-19 06:41:52,535 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:52,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 06:41:52,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:52,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 06:41:52,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=565, Unknown=2, NotChecked=0, Total=650 [2022-11-19 06:41:52,537 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-19 06:41:55,510 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.82s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:42:00,692 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:42:01,872 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 06:42:06,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:06,246 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2022-11-19 06:42:06,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 06:42:06,247 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 22 [2022-11-19 06:42:06,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:06,248 INFO L225 Difference]: With dead ends: 59 [2022-11-19 06:42:06,248 INFO L226 Difference]: Without dead ends: 51 [2022-11-19 06:42:06,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=115, Invalid=812, Unknown=3, NotChecked=0, Total=930 [2022-11-19 06:42:06,251 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 29 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:06,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 70 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 6.4s Time] [2022-11-19 06:42:06,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-19 06:42:06,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2022-11-19 06:42:06,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.125) internal successors, (36), 32 states have internal predecessors, (36), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 06:42:06,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2022-11-19 06:42:06,280 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 22 [2022-11-19 06:42:06,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:06,281 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2022-11-19 06:42:06,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 5 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-19 06:42:06,284 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2022-11-19 06:42:06,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-19 06:42:06,285 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:06,286 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:06,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:06,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:06,492 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:06,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:06,492 INFO L85 PathProgramCache]: Analyzing trace with hash 408559265, now seen corresponding path program 1 times [2022-11-19 06:42:06,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:06,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200913656] [2022-11-19 06:42:06,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:06,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:06,500 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:06,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [435525850] [2022-11-19 06:42:06,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:06,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:06,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:06,502 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:06,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:42:06,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:06,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-19 06:42:06,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:06,632 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:42:06,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:06,740 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:42:06,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:06,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200913656] [2022-11-19 06:42:06,741 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:42:06,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435525850] [2022-11-19 06:42:06,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435525850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:06,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577931218] [2022-11-19 06:42:06,743 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:06,744 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:06,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:42:06,744 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:42:06,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:07,351 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 70 for LOIs [2022-11-19 06:42:07,447 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:07,481 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:09,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1345#(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 [2022-11-19 06:42:09,270 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:09,270 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:09,270 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2022-11-19 06:42:09,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77105391] [2022-11-19 06:42:09,270 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:09,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-19 06:42:09,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:09,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-19 06:42:09,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2022-11-19 06:42:09,272 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-19 06:42:09,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:09,464 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2022-11-19 06:42:09,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 06:42:09,464 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) Word has length 28 [2022-11-19 06:42:09,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:09,465 INFO L225 Difference]: With dead ends: 50 [2022-11-19 06:42:09,465 INFO L226 Difference]: Without dead ends: 45 [2022-11-19 06:42:09,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=101, Invalid=601, Unknown=0, NotChecked=0, Total=702 [2022-11-19 06:42:09,467 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:09,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 75 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:42:09,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-19 06:42:09,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-11-19 06:42:09,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-19 06:42:09,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2022-11-19 06:42:09,484 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 28 [2022-11-19 06:42:09,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:09,484 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2022-11-19 06:42:09,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (5), 3 states have call predecessors, (5), 1 states have call successors, (5) [2022-11-19 06:42:09,485 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2022-11-19 06:42:09,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 06:42:09,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:09,486 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:09,496 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-19 06:42:09,691 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:09,691 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:09,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:09,692 INFO L85 PathProgramCache]: Analyzing trace with hash -235004718, now seen corresponding path program 2 times [2022-11-19 06:42:09,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:09,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067655952] [2022-11-19 06:42:09,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:09,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:09,700 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:09,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2085249545] [2022-11-19 06:42:09,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:42:09,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:09,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:09,702 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:09,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:42:09,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 06:42:09,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:42:09,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-19 06:42:09,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:09,918 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:42:09,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:10,031 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-19 06:42:10,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:10,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067655952] [2022-11-19 06:42:10,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:42:10,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085249545] [2022-11-19 06:42:10,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085249545] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:10,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447975454] [2022-11-19 06:42:10,034 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:10,034 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:10,035 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:42:10,035 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:42:10,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:10,609 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-19 06:42:10,694 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:10,726 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:12,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1780#(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 [2022-11-19 06:42:12,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:12,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:12,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-19 06:42:12,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780018516] [2022-11-19 06:42:12,059 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:12,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 06:42:12,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:12,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 06:42:12,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=541, Unknown=0, NotChecked=0, Total=702 [2022-11-19 06:42:12,061 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 06:42:12,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:12,368 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2022-11-19 06:42:12,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 06:42:12,375 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2022-11-19 06:42:12,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:12,382 INFO L225 Difference]: With dead ends: 98 [2022-11-19 06:42:12,383 INFO L226 Difference]: Without dead ends: 93 [2022-11-19 06:42:12,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=274, Invalid=986, Unknown=0, NotChecked=0, Total=1260 [2022-11-19 06:42:12,384 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 75 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:12,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 113 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 06:42:12,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-19 06:42:12,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-11-19 06:42:12,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 13 states have call successors, (13), 12 states have call predecessors, (13), 11 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-19 06:42:12,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2022-11-19 06:42:12,427 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 46 [2022-11-19 06:42:12,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:12,427 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2022-11-19 06:42:12,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-19 06:42:12,428 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2022-11-19 06:42:12,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-19 06:42:12,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:12,440 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:12,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:12,646 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-19 06:42:12,647 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:12,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:12,647 INFO L85 PathProgramCache]: Analyzing trace with hash -1419782260, now seen corresponding path program 3 times [2022-11-19 06:42:12,647 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:12,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250365931] [2022-11-19 06:42:12,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:12,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:12,659 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:12,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1126623159] [2022-11-19 06:42:12,660 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:42:12,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:12,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:12,661 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:12,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:42:13,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:42:13,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:42:13,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 06:42:13,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:13,434 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:42:13,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:13,747 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-19 06:42:13,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:13,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250365931] [2022-11-19 06:42:13,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:42:13,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126623159] [2022-11-19 06:42:13,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126623159] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:13,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626519625] [2022-11-19 06:42:13,750 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:13,750 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:13,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:42:13,751 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:42:13,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:14,268 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-19 06:42:14,354 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:14,384 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:16,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2660#(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 [2022-11-19 06:42:16,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:16,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:16,106 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-19 06:42:16,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253770889] [2022-11-19 06:42:16,106 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:16,107 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 06:42:16,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:16,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 06:42:16,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=1051, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 06:42:16,108 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 06:42:16,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:16,834 INFO L93 Difference]: Finished difference Result 194 states and 206 transitions. [2022-11-19 06:42:16,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 06:42:16,835 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2022-11-19 06:42:16,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:16,838 INFO L225 Difference]: With dead ends: 194 [2022-11-19 06:42:16,838 INFO L226 Difference]: Without dead ends: 189 [2022-11-19 06:42:16,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1020 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=946, Invalid=2594, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 06:42:16,842 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 252 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:16,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 180 Invalid, 256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:42:16,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2022-11-19 06:42:16,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2022-11-19 06:42:16,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 140 states have (on average 1.0071428571428571) internal successors, (141), 140 states have internal predecessors, (141), 25 states have call successors, (25), 24 states have call predecessors, (25), 23 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-19 06:42:16,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2022-11-19 06:42:16,890 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 94 [2022-11-19 06:42:16,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:16,891 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2022-11-19 06:42:16,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-19 06:42:16,892 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2022-11-19 06:42:16,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-19 06:42:16,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:16,894 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:16,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:17,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:17,101 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:17,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:17,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1763378944, now seen corresponding path program 4 times [2022-11-19 06:42:17,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:17,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147292538] [2022-11-19 06:42:17,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:17,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:17,132 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:17,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1045270573] [2022-11-19 06:42:17,133 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:42:17,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:17,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:17,134 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:17,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 06:42:17,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:17,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-19 06:42:17,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:17,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1938 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-19 06:42:17,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:18,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1938 backedges. 44 proven. 968 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2022-11-19 06:42:18,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:18,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147292538] [2022-11-19 06:42:18,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 06:42:18,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045270573] [2022-11-19 06:42:18,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045270573] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:18,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2116591913] [2022-11-19 06:42:18,954 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:18,955 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:18,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 06:42:18,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 06:42:18,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 06:42:19,469 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-19 06:42:19,539 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-19 06:42:19,577 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 06:42:22,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4428#(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 [2022-11-19 06:42:22,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 06:42:22,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:22,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-11-19 06:42:22,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649155558] [2022-11-19 06:42:22,934 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:22,937 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-19 06:42:22,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:22,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-19 06:42:22,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=2503, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 06:42:22,940 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 06:42:25,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:25,000 INFO L93 Difference]: Finished difference Result 386 states and 410 transitions. [2022-11-19 06:42:25,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-11-19 06:42:25,001 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2022-11-19 06:42:25,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:25,006 INFO L225 Difference]: With dead ends: 386 [2022-11-19 06:42:25,010 INFO L226 Difference]: Without dead ends: 381 [2022-11-19 06:42:25,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2790 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=3586, Invalid=7970, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 06:42:25,014 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 442 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 442 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:25,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [442 Valid, 339 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:42:25,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2022-11-19 06:42:25,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 381. [2022-11-19 06:42:25,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 284 states have (on average 1.0035211267605635) internal successors, (285), 284 states have internal predecessors, (285), 49 states have call successors, (49), 48 states have call predecessors, (49), 47 states have return successors, (48), 48 states have call predecessors, (48), 48 states have call successors, (48) [2022-11-19 06:42:25,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 382 transitions. [2022-11-19 06:42:25,085 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 382 transitions. Word has length 190 [2022-11-19 06:42:25,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:25,085 INFO L495 AbstractCegarLoop]: Abstraction has 381 states and 382 transitions. [2022-11-19 06:42:25,086 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-19 06:42:25,086 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 382 transitions. [2022-11-19 06:42:25,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2022-11-19 06:42:25,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:25,094 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:25,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:25,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:25,300 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:25,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:25,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1767238632, now seen corresponding path program 5 times [2022-11-19 06:42:25,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:25,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898851607] [2022-11-19 06:42:25,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:25,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:25,331 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 06:42:25,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [16225778] [2022-11-19 06:42:25,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:42:25,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:25,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:25,333 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:25,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19aa3c36-438c-49c6-8cb9-118d7448d3e1/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process