./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V --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 462bdab67ac93ddd789186f30bfdfc189629d2959c27ec219da5960b800d2042 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:55:06,879 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:55:06,883 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:55:06,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:55:06,919 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:55:06,920 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:55:06,922 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:55:06,925 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:55:06,927 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:55:06,928 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:55:06,929 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:55:06,930 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:55:06,931 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:55:06,932 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:55:06,934 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:55:06,937 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:55:06,939 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:55:06,942 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:55:06,947 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:55:06,951 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:55:06,956 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:55:06,961 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:55:06,963 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:55:06,964 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:55:06,969 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:55:06,970 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:55:06,971 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:55:06,973 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:55:06,975 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:55:06,977 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:55:06,977 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:55:06,978 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:55:06,980 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:55:06,981 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:55:06,983 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:55:06,983 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:55:06,984 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:55:06,984 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:55:06,984 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:55:06,985 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:55:06,986 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:55:06,986 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:55:07,035 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:55:07,036 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:55:07,036 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:55:07,037 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:55:07,043 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:55:07,044 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:55:07,044 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:55:07,045 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:55:07,045 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:55:07,045 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:55:07,046 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:55:07,046 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:55:07,046 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:55:07,047 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:55:07,047 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:55:07,047 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:55:07,047 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:55:07,048 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:55:07,048 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:55:07,049 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:55:07,049 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:55:07,049 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:55:07,049 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:55:07,049 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:55:07,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:55:07,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:55:07,051 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:55:07,052 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:55:07,052 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:55:07,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:55:07,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:55:07,053 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:55:07,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:55:07,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:55:07,053 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:55:07,054 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:55:07,054 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:55:07,054 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:55:07,054 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:55:07,054 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:55:07,055 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:55:07,055 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 462bdab67ac93ddd789186f30bfdfc189629d2959c27ec219da5960b800d2042 [2021-11-23 02:55:07,293 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:55:07,314 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:55:07,316 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:55:07,317 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:55:07,318 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:55:07,318 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i [2021-11-23 02:55:07,395 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/data/7b285ac2c/154d353bdbbb4cdf89efeb3c3895f89b/FLAGc860681f4 [2021-11-23 02:55:07,899 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:55:07,900 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i [2021-11-23 02:55:07,911 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/data/7b285ac2c/154d353bdbbb4cdf89efeb3c3895f89b/FLAGc860681f4 [2021-11-23 02:55:08,259 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/data/7b285ac2c/154d353bdbbb4cdf89efeb3c3895f89b [2021-11-23 02:55:08,261 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:55:08,263 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:55:08,279 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:55:08,279 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:55:08,282 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:55:08,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,287 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b75f900 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08, skipping insertion in model container [2021-11-23 02:55:08,287 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,295 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:55:08,315 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:55:08,544 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i[950,963] [2021-11-23 02:55:08,572 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:55:08,581 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:55:08,597 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/sv-benchmarks/c/nla-digbench-scaling/divbin_unwindbound50.i[950,963] [2021-11-23 02:55:08,621 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:55:08,639 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:55:08,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08 WrapperNode [2021-11-23 02:55:08,640 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:55:08,641 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:55:08,642 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:55:08,642 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:55:08,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,657 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,680 INFO L137 Inliner]: procedures = 16, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 54 [2021-11-23 02:55:08,680 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:55:08,681 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:55:08,682 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:55:08,682 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:55:08,690 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,702 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,702 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,712 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,723 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,725 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:55:08,732 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:55:08,732 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:55:08,732 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:55:08,733 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (1/1) ... [2021-11-23 02:55:08,741 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:55:08,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:08,772 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:55:08,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:55:08,820 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:55:08,820 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:55:08,820 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:55:08,820 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:55:08,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:55:08,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:55:08,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:55:08,821 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:55:08,883 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:55:08,885 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:55:09,002 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:55:09,028 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:55:09,028 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:55:09,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:55:09 BoogieIcfgContainer [2021-11-23 02:55:09,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:55:09,033 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:55:09,033 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:55:09,036 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:55:09,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:55:08" (1/3) ... [2021-11-23 02:55:09,037 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e0b2b87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:55:09, skipping insertion in model container [2021-11-23 02:55:09,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:55:08" (2/3) ... [2021-11-23 02:55:09,038 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e0b2b87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:55:09, skipping insertion in model container [2021-11-23 02:55:09,038 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:55:09" (3/3) ... [2021-11-23 02:55:09,040 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound50.i [2021-11-23 02:55:09,045 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:55:09,045 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:55:09,091 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:55:09,099 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:55:09,099 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:55:09,115 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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) [2021-11-23 02:55:09,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:55:09,121 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:09,122 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:09,123 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:09,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:09,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1734137638, now seen corresponding path program 1 times [2021-11-23 02:55:09,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:09,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981223376] [2021-11-23 02:55:09,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:09,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:09,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:09,355 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:09,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:09,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981223376] [2021-11-23 02:55:09,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981223376] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:55:09,359 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:55:09,359 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:55:09,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010850895] [2021-11-23 02:55:09,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:55:09,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 02:55:09,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:09,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 02:55:09,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:55:09,410 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 4.0) internal successors, (8), 2 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) [2021-11-23 02:55:09,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:09,459 INFO L93 Difference]: Finished difference Result 35 states and 49 transitions. [2021-11-23 02:55:09,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 02:55:09,462 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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 [2021-11-23 02:55:09,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:09,471 INFO L225 Difference]: With dead ends: 35 [2021-11-23 02:55:09,471 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:55:09,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 02:55:09,481 INFO L933 BasicCegarLoop]: 23 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, 23 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 [2021-11-23 02:55:09,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:55:09,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:55:09,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:55:09,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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) [2021-11-23 02:55:09,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-11-23 02:55:09,535 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 14 [2021-11-23 02:55:09,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:09,537 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-11-23 02:55:09,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 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) [2021-11-23 02:55:09,537 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-11-23 02:55:09,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:55:09,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:09,541 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:09,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:55:09,542 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:09,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:09,547 INFO L85 PathProgramCache]: Analyzing trace with hash -207211284, now seen corresponding path program 1 times [2021-11-23 02:55:09,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:09,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575624475] [2021-11-23 02:55:09,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:09,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:09,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:09,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:09,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:09,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575624475] [2021-11-23 02:55:09,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575624475] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:55:09,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:55:09,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:55:09,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300096963] [2021-11-23 02:55:09,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:55:09,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:55:09,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:09,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:55:09,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:55:09,683 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-23 02:55:09,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:09,725 INFO L93 Difference]: Finished difference Result 33 states and 41 transitions. [2021-11-23 02:55:09,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:55:09,726 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 16 [2021-11-23 02:55:09,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:09,727 INFO L225 Difference]: With dead ends: 33 [2021-11-23 02:55:09,727 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 02:55:09,728 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:55:09,730 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:09,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 53 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:55:09,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 02:55:09,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 02:55:09,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 16 states have internal predecessors, (20), 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) [2021-11-23 02:55:09,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-23 02:55:09,737 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-11-23 02:55:09,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:09,738 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-23 02:55:09,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-23 02:55:09,738 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-23 02:55:09,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 02:55:09,739 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:09,739 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:09,740 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:55:09,740 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:09,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:09,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1776102932, now seen corresponding path program 1 times [2021-11-23 02:55:09,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:09,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788102989] [2021-11-23 02:55:09,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:09,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:09,757 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:09,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2065129425] [2021-11-23 02:55:09,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:09,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:09,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:09,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:09,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:55:09,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:09,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:55:09,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:10,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:55:10,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:10,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:10,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:10,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788102989] [2021-11-23 02:55:10,272 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:10,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065129425] [2021-11-23 02:55:10,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065129425] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:55:10,273 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:55:10,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-11-23 02:55:10,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991063977] [2021-11-23 02:55:10,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:55:10,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:55:10,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:10,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:55:10,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:55:10,275 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-11-23 02:55:12,412 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:55:12,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:12,577 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-11-23 02:55:12,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:55:12,579 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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 17 [2021-11-23 02:55:12,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:12,582 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:55:12,582 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 02:55:12,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:55:12,584 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:12,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 81 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:55:12,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 02:55:12,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-23 02:55:12,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 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) [2021-11-23 02:55:12,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-23 02:55:12,607 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2021-11-23 02:55:12,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:12,608 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-23 02:55:12,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 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) [2021-11-23 02:55:12,608 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-23 02:55:12,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:55:12,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:12,610 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:12,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:12,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:12,811 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:12,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:12,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1737998361, now seen corresponding path program 1 times [2021-11-23 02:55:12,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:12,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954762699] [2021-11-23 02:55:12,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:12,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:12,830 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:12,835 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1752163136] [2021-11-23 02:55:12,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:12,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:12,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:12,843 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:12,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:55:12,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:12,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:55:12,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:13,007 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:13,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:13,107 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:13,108 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:13,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954762699] [2021-11-23 02:55:13,108 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:13,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752163136] [2021-11-23 02:55:13,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752163136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:13,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041413741] [2021-11-23 02:55:13,130 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-23 02:55:13,131 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:13,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:13,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:13,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:13,626 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2021-11-23 02:55:13,659 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2021-11-23 02:55:13,705 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:55:15,468 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '489#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (< ~counter~0 51) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:55:15,468 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:55:15,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:55:15,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-23 02:55:15,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920666159] [2021-11-23 02:55:15,469 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:15,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:55:15,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:15,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:55:15,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:55:15,471 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:55:15,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:15,672 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2021-11-23 02:55:15,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:55:15,673 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2021-11-23 02:55:15,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:15,676 INFO L225 Difference]: With dead ends: 62 [2021-11-23 02:55:15,678 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:55:15,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:55:15,682 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:15,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 109 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:55:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:55:15,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 39. [2021-11-23 02:55:15,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 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) [2021-11-23 02:55:15,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-23 02:55:15,705 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 19 [2021-11-23 02:55:15,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:15,706 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-23 02:55:15,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:55:15,708 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-23 02:55:15,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:55:15,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:15,719 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:15,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 02:55:15,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:15,920 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:15,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:15,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1948059783, now seen corresponding path program 1 times [2021-11-23 02:55:15,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:15,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546194866] [2021-11-23 02:55:15,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:15,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:15,961 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:15,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2130024357] [2021-11-23 02:55:15,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:15,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:15,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:15,963 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:15,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:55:16,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:16,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:55:16,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:16,387 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:55:16,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:16,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:16,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:16,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546194866] [2021-11-23 02:55:16,746 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:16,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130024357] [2021-11-23 02:55:16,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130024357] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:55:16,746 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:55:16,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-11-23 02:55:16,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502688835] [2021-11-23 02:55:16,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:55:16,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:55:16,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:16,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:55:16,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-23 02:55:16,749 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-23 02:55:16,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:16,804 INFO L93 Difference]: Finished difference Result 49 states and 58 transitions. [2021-11-23 02:55:16,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:55:16,805 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 20 [2021-11-23 02:55:16,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:16,808 INFO L225 Difference]: With dead ends: 49 [2021-11-23 02:55:16,808 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 02:55:16,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:55:16,810 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 9 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:16,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 106 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 13 Unchecked, 0.0s Time] [2021-11-23 02:55:16,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 02:55:16,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-11-23 02:55:16,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 37 states have internal predecessors, (44), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 02:55:16,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2021-11-23 02:55:16,820 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 20 [2021-11-23 02:55:16,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:16,821 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2021-11-23 02:55:16,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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) [2021-11-23 02:55:16,821 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2021-11-23 02:55:16,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:55:16,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:16,825 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:16,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:17,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:17,047 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:17,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:17,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1946272323, now seen corresponding path program 1 times [2021-11-23 02:55:17,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:17,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860699344] [2021-11-23 02:55:17,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:17,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:17,064 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:17,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [121688169] [2021-11-23 02:55:17,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:17,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:17,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:17,066 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:17,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:55:17,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:17,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:55:17,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:17,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:17,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:17,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:17,362 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:17,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860699344] [2021-11-23 02:55:17,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:17,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121688169] [2021-11-23 02:55:17,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121688169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:17,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423664548] [2021-11-23 02:55:17,366 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-23 02:55:17,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:17,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:17,367 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:17,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:17,701 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:55:17,734 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2021-11-23 02:55:17,764 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:55:19,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1017#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 51 ~counter~0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:55:19,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:55:19,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:55:19,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2021-11-23 02:55:19,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785286454] [2021-11-23 02:55:19,194 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:19,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 02:55:19,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:19,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 02:55:19,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:55:19,196 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:55:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:19,416 INFO L93 Difference]: Finished difference Result 116 states and 138 transitions. [2021-11-23 02:55:19,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:55:19,418 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 20 [2021-11-23 02:55:19,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:19,420 INFO L225 Difference]: With dead ends: 116 [2021-11-23 02:55:19,420 INFO L226 Difference]: Without dead ends: 109 [2021-11-23 02:55:19,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:55:19,422 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 66 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:19,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 106 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:55:19,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-23 02:55:19,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 102. [2021-11-23 02:55:19,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 76 states have (on average 1.236842105263158) internal successors, (94), 84 states have internal predecessors, (94), 15 states have call successors, (15), 10 states have call predecessors, (15), 10 states have return successors, (11), 7 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-23 02:55:19,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 120 transitions. [2021-11-23 02:55:19,458 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 120 transitions. Word has length 20 [2021-11-23 02:55:19,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:19,459 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 120 transitions. [2021-11-23 02:55:19,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 02:55:19,459 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 120 transitions. [2021-11-23 02:55:19,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:55:19,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:19,460 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:19,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:19,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:55:19,691 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:19,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:19,691 INFO L85 PathProgramCache]: Analyzing trace with hash -1825805005, now seen corresponding path program 1 times [2021-11-23 02:55:19,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:19,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789139681] [2021-11-23 02:55:19,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:19,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:19,700 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:19,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [155920297] [2021-11-23 02:55:19,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:19,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:19,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:19,702 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:19,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:55:19,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:19,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:55:19,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:19,783 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:55:19,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:55:19,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:19,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789139681] [2021-11-23 02:55:19,784 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:19,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155920297] [2021-11-23 02:55:19,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155920297] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:55:19,784 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:55:19,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:55:19,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122332041] [2021-11-23 02:55:19,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:55:19,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:55:19,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:19,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:55:19,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:55:19,786 INFO L87 Difference]: Start difference. First operand 102 states and 120 transitions. Second operand has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:55:21,812 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2021-11-23 02:55:21,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:21,815 INFO L93 Difference]: Finished difference Result 139 states and 164 transitions. [2021-11-23 02:55:21,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:55:21,963 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-11-23 02:55:21,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:21,964 INFO L225 Difference]: With dead ends: 139 [2021-11-23 02:55:21,964 INFO L226 Difference]: Without dead ends: 89 [2021-11-23 02:55:21,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:55:21,966 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:21,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 39 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 1 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 02:55:21,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-23 02:55:21,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-23 02:55:21,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 67 states have (on average 1.2388059701492538) internal successors, (83), 73 states have internal predecessors, (83), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 02:55:21,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 105 transitions. [2021-11-23 02:55:21,978 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 105 transitions. Word has length 25 [2021-11-23 02:55:21,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:21,990 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 105 transitions. [2021-11-23 02:55:21,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 02:55:21,991 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 105 transitions. [2021-11-23 02:55:21,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:55:21,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:21,992 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:22,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:22,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:22,195 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:22,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:22,195 INFO L85 PathProgramCache]: Analyzing trace with hash -687200305, now seen corresponding path program 1 times [2021-11-23 02:55:22,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:22,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582157415] [2021-11-23 02:55:22,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:22,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:22,205 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:22,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2105435076] [2021-11-23 02:55:22,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:22,205 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:22,205 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:22,216 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:22,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:55:22,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:22,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:55:22,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:22,368 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:55:22,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:22,544 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:55:22,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:22,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582157415] [2021-11-23 02:55:22,545 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:55:22,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105435076] [2021-11-23 02:55:22,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105435076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:22,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2101311942] [2021-11-23 02:55:22,548 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2021-11-23 02:55:22,548 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:22,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:22,549 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:22,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:22,972 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 49 for LOIs [2021-11-23 02:55:23,109 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2021-11-23 02:55:23,136 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:55:24,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1854#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (< ~counter~0 51) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:55:24,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:55:24,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:55:24,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-23 02:55:24,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394343827] [2021-11-23 02:55:24,918 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:24,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:55:24,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:24,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:55:24,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=560, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:55:24,920 INFO L87 Difference]: Start difference. First operand 89 states and 105 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:55:27,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-23 02:55:27,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:27,321 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2021-11-23 02:55:27,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:55:27,321 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-23 02:55:27,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:27,323 INFO L225 Difference]: With dead ends: 104 [2021-11-23 02:55:27,323 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 02:55:27,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:55:27,325 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 16 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:27,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 104 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 65 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:55:27,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 02:55:27,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-23 02:55:27,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 65 states have (on average 1.1846153846153846) internal successors, (77), 69 states have internal predecessors, (77), 10 states have call successors, (10), 8 states have call predecessors, (10), 8 states have return successors, (9), 6 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 02:55:27,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 96 transitions. [2021-11-23 02:55:27,339 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 96 transitions. Word has length 26 [2021-11-23 02:55:27,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:27,340 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 96 transitions. [2021-11-23 02:55:27,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 02:55:27,340 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 96 transitions. [2021-11-23 02:55:27,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 02:55:27,342 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:27,342 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:27,368 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:55:27,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:27,555 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:55:27,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:27,555 INFO L85 PathProgramCache]: Analyzing trace with hash -810539866, now seen corresponding path program 1 times [2021-11-23 02:55:27,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:27,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897990101] [2021-11-23 02:55:27,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:27,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:27,583 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:55:27,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1551343853] [2021-11-23 02:55:27,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:27,584 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:27,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:27,592 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:27,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_616eaaa8-d1a4-4090-8713-7d4ccb36202e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process