./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7 --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 1af9610c3f2ac44e456633c84d2e8d0495857443026005d5daf994731366c726 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:09:19,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:09:19,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:09:19,812 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:09:19,813 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:09:19,816 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:09:19,818 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:09:19,822 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:09:19,825 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:09:19,830 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:09:19,831 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:09:19,833 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:09:19,833 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:09:19,836 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:09:19,838 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:09:19,842 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:09:19,844 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:09:19,845 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:09:19,850 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:09:19,857 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:09:19,859 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:09:19,860 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:09:19,863 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:09:19,864 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:09:19,873 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:09:19,873 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:09:19,874 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:09:19,876 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:09:19,876 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:09:19,878 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:09:19,878 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:09:19,879 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:09:19,881 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:09:19,883 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:09:19,884 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:09:19,885 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:09:19,885 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:09:19,886 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:09:19,886 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:09:19,887 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:09:19,888 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:09:19,889 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:09:19,929 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:09:19,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:09:19,930 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:09:19,930 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:09:19,931 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:09:19,937 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:09:19,938 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:09:19,938 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:09:19,938 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:09:19,938 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:09:19,939 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:09:19,939 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:09:19,940 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:09:19,940 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:09:19,940 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:09:19,940 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:09:19,940 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:09:19,941 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:09:19,941 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:09:19,942 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:09:19,942 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:09:19,942 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:09:19,942 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:09:19,942 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:09:19,943 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:09:19,943 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:09:19,943 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:09:19,943 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:09:19,943 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:09:19,944 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:09:19,944 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:09:19,944 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:09:19,944 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:09:19,945 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:09:19,945 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:09:19,945 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:09:19,945 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:09:19,945 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:09:19,946 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:09:19,946 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:09:19,946 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:09:19,946 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_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1af9610c3f2ac44e456633c84d2e8d0495857443026005d5daf994731366c726 [2021-11-25 20:09:20,221 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:09:20,241 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:09:20,244 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:09:20,245 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:09:20,245 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:09:20,247 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c [2021-11-25 20:09:20,309 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/data/6567f589e/389eb2b152e34d63be9a811dde61d753/FLAGd7eb871d9 [2021-11-25 20:09:20,744 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:09:20,744 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c [2021-11-25 20:09:20,750 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/data/6567f589e/389eb2b152e34d63be9a811dde61d753/FLAGd7eb871d9 [2021-11-25 20:09:21,138 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/data/6567f589e/389eb2b152e34d63be9a811dde61d753 [2021-11-25 20:09:21,140 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:09:21,141 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:09:21,143 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:09:21,143 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:09:21,146 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:09:21,147 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,148 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a4ce4b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21, skipping insertion in model container [2021-11-25 20:09:21,148 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,155 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:09:21,174 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:09:21,347 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_17b9e740-d028-4ea0-8c0c-c3cb129655ff/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c[490,503] [2021-11-25 20:09:21,368 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:09:21,374 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:09:21,385 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_17b9e740-d028-4ea0-8c0c-c3cb129655ff/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound10.c[490,503] [2021-11-25 20:09:21,396 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:09:21,408 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:09:21,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21 WrapperNode [2021-11-25 20:09:21,409 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:09:21,410 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:09:21,410 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:09:21,411 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:09:21,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,424 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,445 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2021-11-25 20:09:21,445 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:09:21,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:09:21,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:09:21,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:09:21,454 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,454 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,456 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,456 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,461 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,465 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,466 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,468 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:09:21,469 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:09:21,469 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:09:21,469 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:09:21,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (1/1) ... [2021-11-25 20:09:21,477 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:09:21,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:21,501 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:09:21,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:09:21,541 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:09:21,542 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 20:09:21,542 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 20:09:21,542 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:09:21,542 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:09:21,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:09:21,543 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 20:09:21,543 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 20:09:21,598 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:09:21,599 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:09:21,728 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:09:21,750 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:09:21,751 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 20:09:21,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:09:21 BoogieIcfgContainer [2021-11-25 20:09:21,753 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:09:21,755 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:09:21,755 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:09:21,760 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:09:21,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:09:21" (1/3) ... [2021-11-25 20:09:21,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3deb0ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:09:21, skipping insertion in model container [2021-11-25 20:09:21,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:09:21" (2/3) ... [2021-11-25 20:09:21,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3deb0ecf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:09:21, skipping insertion in model container [2021-11-25 20:09:21,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:09:21" (3/3) ... [2021-11-25 20:09:21,763 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound10.c [2021-11-25 20:09:21,769 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:09:21,769 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:09:21,824 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:09:21,840 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 [2021-11-25 20:09:21,840 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:09:21,858 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-25 20:09:21,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:09:21,890 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:21,890 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:21,891 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:21,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:21,896 INFO L85 PathProgramCache]: Analyzing trace with hash 966807424, now seen corresponding path program 1 times [2021-11-25 20:09:21,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:21,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673515912] [2021-11-25 20:09:21,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:21,918 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:22,020 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:22,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [713298394] [2021-11-25 20:09:22,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:22,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:22,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:22,026 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:22,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:09:22,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:22,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-25 20:09:22,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:09:22,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:09:22,252 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:22,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673515912] [2021-11-25 20:09:22,252 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:22,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713298394] [2021-11-25 20:09:22,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713298394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:09:22,253 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:09:22,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:09:22,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116160917] [2021-11-25 20:09:22,257 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:09:22,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 20:09:22,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:22,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 20:09:22,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:09:22,290 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 20:09:22,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:22,318 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2021-11-25 20:09:22,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 20:09:22,321 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2021-11-25 20:09:22,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:22,332 INFO L225 Difference]: With dead ends: 49 [2021-11-25 20:09:22,332 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 20:09:22,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 20:09:22,347 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:22,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:09:22,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 20:09:22,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-25 20:09:22,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:09:22,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-11-25 20:09:22,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2021-11-25 20:09:22,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:22,423 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-11-25 20:09:22,423 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 20:09:22,423 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-11-25 20:09:22,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 20:09:22,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:22,425 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:22,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:22,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:22,630 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:22,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:22,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1643993843, now seen corresponding path program 1 times [2021-11-25 20:09:22,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:22,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109316741] [2021-11-25 20:09:22,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:22,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:22,675 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:22,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [8792758] [2021-11-25 20:09:22,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:22,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:22,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:22,690 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:22,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:09:22,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:22,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:09:22,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:22,901 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:09:22,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:23,071 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:09:23,071 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:23,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109316741] [2021-11-25 20:09:23,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:23,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8792758] [2021-11-25 20:09:23,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8792758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:09:23,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [577400085] [2021-11-25 20:09:23,104 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:09:23,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:09:23,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:09:23,121 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:09:23,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:09:24,357 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:09:24,388 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:09:25,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [577400085] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:09:25,284 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:09:25,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5] total 14 [2021-11-25 20:09:25,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518808776] [2021-11-25 20:09:25,286 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:09:25,286 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 20:09:25,286 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:25,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 20:09:25,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:09:25,288 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:09:25,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:25,509 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-11-25 20:09:25,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:09:25,510 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-25 20:09:25,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:25,512 INFO L225 Difference]: With dead ends: 38 [2021-11-25 20:09:25,512 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 20:09:25,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:09:25,518 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 44 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:25,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 48 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:09:25,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 20:09:25,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-25 20:09:25,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:09:25,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2021-11-25 20:09:25,544 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2021-11-25 20:09:25,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:25,544 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2021-11-25 20:09:25,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-25 20:09:25,545 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2021-11-25 20:09:25,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 20:09:25,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:25,547 INFO L514 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:25,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:25,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 20:09:25,763 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:25,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:25,764 INFO L85 PathProgramCache]: Analyzing trace with hash -575116102, now seen corresponding path program 1 times [2021-11-25 20:09:25,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:25,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318397715] [2021-11-25 20:09:25,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:25,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:25,787 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:25,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [295105009] [2021-11-25 20:09:25,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:25,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:25,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:25,809 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:25,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:09:25,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:25,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:09:25,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:25,989 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:09:25,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:26,092 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:09:26,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:26,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318397715] [2021-11-25 20:09:26,094 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:26,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295105009] [2021-11-25 20:09:26,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295105009] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:09:26,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:09:26,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 20:09:26,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963537294] [2021-11-25 20:09:26,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:09:26,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:09:26,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:26,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:09:26,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:09:26,098 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 20:09:26,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:26,152 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2021-11-25 20:09:26,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:09:26,153 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2021-11-25 20:09:26,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:26,154 INFO L225 Difference]: With dead ends: 36 [2021-11-25 20:09:26,154 INFO L226 Difference]: Without dead ends: 34 [2021-11-25 20:09:26,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:09:26,156 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:26,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 111 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:09:26,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-25 20:09:26,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-25 20:09:26,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 12 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-25 20:09:26,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-25 20:09:26,168 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 28 [2021-11-25 20:09:26,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:26,169 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-25 20:09:26,169 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-25 20:09:26,169 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-25 20:09:26,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 20:09:26,171 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:26,171 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:26,194 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:26,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:26,386 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:26,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:26,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1810277145, now seen corresponding path program 1 times [2021-11-25 20:09:26,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:26,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094027928] [2021-11-25 20:09:26,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:26,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:26,415 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:26,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1017105749] [2021-11-25 20:09:26,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:26,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:26,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:26,417 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:26,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:09:26,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:26,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 20:09:26,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:26,688 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:09:26,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:26,803 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 20:09:26,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:26,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094027928] [2021-11-25 20:09:26,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:26,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017105749] [2021-11-25 20:09:26,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017105749] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:09:26,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:09:26,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2021-11-25 20:09:26,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649606799] [2021-11-25 20:09:26,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:09:26,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:09:26,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:26,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:09:26,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 20:09:26,814 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:09:26,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:26,866 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-11-25 20:09:26,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:09:26,867 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2021-11-25 20:09:26,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:26,869 INFO L225 Difference]: With dead ends: 47 [2021-11-25 20:09:26,870 INFO L226 Difference]: Without dead ends: 45 [2021-11-25 20:09:26,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 20:09:26,873 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 7 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:26,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 137 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:09:26,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-25 20:09:26,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-11-25 20:09:26,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 20:09:26,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 58 transitions. [2021-11-25 20:09:26,897 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 58 transitions. Word has length 33 [2021-11-25 20:09:26,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:26,898 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 58 transitions. [2021-11-25 20:09:26,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-25 20:09:26,898 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 58 transitions. [2021-11-25 20:09:26,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:09:26,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:26,902 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:26,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:27,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:27,126 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:27,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:27,127 INFO L85 PathProgramCache]: Analyzing trace with hash -1313498982, now seen corresponding path program 1 times [2021-11-25 20:09:27,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:27,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390020677] [2021-11-25 20:09:27,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:27,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:27,148 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:27,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1227646520] [2021-11-25 20:09:27,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:27,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:27,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:27,150 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:27,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:09:27,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:27,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:09:27,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:27,352 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 20:09:27,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:27,405 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:27,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390020677] [2021-11-25 20:09:27,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:27,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1227646520] [2021-11-25 20:09:27,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1227646520] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:09:27,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2049488771] [2021-11-25 20:09:27,410 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2021-11-25 20:09:27,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:09:27,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:09:27,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:09:27,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:09:28,488 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 20:09:28,503 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:09:28,527 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:09:29,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2049488771] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:09:29,879 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:09:29,879 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [7] total 19 [2021-11-25 20:09:29,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179962336] [2021-11-25 20:09:29,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:09:29,880 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:09:29,880 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:29,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:09:29,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:09:29,881 INFO L87 Difference]: Start difference. First operand 44 states and 58 transitions. Second operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 20:09:30,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:30,215 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2021-11-25 20:09:30,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:09:30,216 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 38 [2021-11-25 20:09:30,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:30,218 INFO L225 Difference]: With dead ends: 65 [2021-11-25 20:09:30,218 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 20:09:30,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 52 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:09:30,220 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 42 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:30,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 47 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:09:30,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 20:09:30,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-11-25 20:09:30,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 20:09:30,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2021-11-25 20:09:30,252 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 38 [2021-11-25 20:09:30,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:30,255 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2021-11-25 20:09:30,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 7 states have internal predecessors, (12), 6 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-25 20:09:30,255 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2021-11-25 20:09:30,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:09:30,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:30,257 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:30,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:30,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:30,474 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:30,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:30,474 INFO L85 PathProgramCache]: Analyzing trace with hash 434944611, now seen corresponding path program 1 times [2021-11-25 20:09:30,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:30,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130375798] [2021-11-25 20:09:30,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:30,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:30,486 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:30,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [436611268] [2021-11-25 20:09:30,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:30,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:30,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:30,488 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:30,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:09:30,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:30,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 20:09:30,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:30,673 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:09:30,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:30,806 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:09:30,806 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:30,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130375798] [2021-11-25 20:09:30,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:30,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436611268] [2021-11-25 20:09:30,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436611268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:09:30,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [348623320] [2021-11-25 20:09:30,810 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:09:30,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:09:30,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:09:30,811 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:09:30,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:09:46,304 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 10 for LOIs [2021-11-25 20:09:46,311 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:09:46,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:09:49,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1775#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:09:49,329 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:09:49,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:09:49,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-11-25 20:09:49,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68842271] [2021-11-25 20:09:49,330 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:09:49,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:09:49,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:09:49,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:09:49,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:09:49,331 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 20:09:49,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:09:49,529 INFO L93 Difference]: Finished difference Result 103 states and 142 transitions. [2021-11-25 20:09:49,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 20:09:49,529 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2021-11-25 20:09:49,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:09:49,534 INFO L225 Difference]: With dead ends: 103 [2021-11-25 20:09:49,534 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 20:09:49,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 121 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:09:49,536 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 28 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:09:49,537 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 239 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:09:49,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 20:09:49,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 86. [2021-11-25 20:09:49,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 32 states have call successors, (32), 7 states have call predecessors, (32), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-25 20:09:49,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2021-11-25 20:09:49,581 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 52 [2021-11-25 20:09:49,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:09:49,581 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2021-11-25 20:09:49,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-25 20:09:49,582 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2021-11-25 20:09:49,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:09:49,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:09:49,590 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:09:49,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:09:49,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 20:09:49,809 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:09:49,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:09:49,810 INFO L85 PathProgramCache]: Analyzing trace with hash -243308457, now seen corresponding path program 1 times [2021-11-25 20:09:49,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:09:49,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043074365] [2021-11-25 20:09:49,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:49,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:09:49,823 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:09:49,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [3289863] [2021-11-25 20:09:49,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:09:49,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:09:49,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:09:49,827 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:09:49,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:09:49,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:09:49,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:09:49,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:09:50,011 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:09:50,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:09:50,191 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-25 20:09:50,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:09:50,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043074365] [2021-11-25 20:09:50,192 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:09:50,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3289863] [2021-11-25 20:09:50,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3289863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:09:50,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [570986560] [2021-11-25 20:09:50,195 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:09:50,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:09:50,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:09:50,196 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:09:50,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:10:03,394 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2021-11-25 20:10:03,405 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:10:03,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:10:06,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [570986560] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:10:06,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:10:06,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [8, 8] total 24 [2021-11-25 20:10:06,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188196061] [2021-11-25 20:10:06,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:10:06,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-25 20:10:06,792 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:10:06,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-25 20:10:06,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-11-25 20:10:06,794 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 20:10:08,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:10:08,060 INFO L93 Difference]: Finished difference Result 105 states and 140 transitions. [2021-11-25 20:10:08,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:10:08,061 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) Word has length 58 [2021-11-25 20:10:08,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:10:08,063 INFO L225 Difference]: With dead ends: 105 [2021-11-25 20:10:08,063 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 20:10:08,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 133 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=162, Invalid=540, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:10:08,064 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 74 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:10:08,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 50 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:10:08,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 20:10:08,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-11-25 20:10:08,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 57 states have (on average 1.1754385964912282) internal successors, (67), 58 states have internal predecessors, (67), 36 states have call successors, (36), 9 states have call predecessors, (36), 9 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-25 20:10:08,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 138 transitions. [2021-11-25 20:10:08,086 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 138 transitions. Word has length 58 [2021-11-25 20:10:08,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:10:08,087 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 138 transitions. [2021-11-25 20:10:08,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 7 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-25 20:10:08,087 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 138 transitions. [2021-11-25 20:10:08,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:10:08,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:10:08,088 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:10:08,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:10:08,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:10:08,302 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:10:08,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:10:08,303 INFO L85 PathProgramCache]: Analyzing trace with hash -331691367, now seen corresponding path program 1 times [2021-11-25 20:10:08,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:10:08,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178034244] [2021-11-25 20:10:08,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:10:08,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:10:08,314 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:10:08,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [892894346] [2021-11-25 20:10:08,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:10:08,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:10:08,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:10:08,318 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:10:08,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:10:08,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:10:08,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:10:08,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:10:08,487 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 20:10:08,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:10:08,637 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 21 proven. 10 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-25 20:10:08,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:10:08,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178034244] [2021-11-25 20:10:08,638 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:10:08,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892894346] [2021-11-25 20:10:08,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892894346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:10:08,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977188012] [2021-11-25 20:10:08,645 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 20:10:08,645 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:10:08,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:10:08,645 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:10:08,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:10:14,515 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2021-11-25 20:10:14,596 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:10:14,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:10:18,031 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3154#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:10:18,031 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:10:18,031 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:10:18,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 20:10:18,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884533282] [2021-11-25 20:10:18,032 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:10:18,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:10:18,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:10:18,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:10:18,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=578, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:10:18,033 INFO L87 Difference]: Start difference. First operand 103 states and 138 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 20:10:18,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:10:18,190 INFO L93 Difference]: Finished difference Result 117 states and 153 transitions. [2021-11-25 20:10:18,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:10:18,191 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 60 [2021-11-25 20:10:18,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:10:18,194 INFO L225 Difference]: With dead ends: 117 [2021-11-25 20:10:18,194 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 20:10:18,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 143 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=140, Invalid=672, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:10:18,195 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 18 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:10:18,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 93 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:10:18,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 20:10:18,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2021-11-25 20:10:18,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 64 states have (on average 1.15625) internal successors, (74), 66 states have internal predecessors, (74), 39 states have call successors, (39), 11 states have call predecessors, (39), 11 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-11-25 20:10:18,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 151 transitions. [2021-11-25 20:10:18,218 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 151 transitions. Word has length 60 [2021-11-25 20:10:18,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:10:18,219 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 151 transitions. [2021-11-25 20:10:18,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-25 20:10:18,219 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 151 transitions. [2021-11-25 20:10:18,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 20:10:18,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:10:18,220 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:10:18,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:10:18,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:10:18,430 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:10:18,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:10:18,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1984692712, now seen corresponding path program 2 times [2021-11-25 20:10:18,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:10:18,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371108871] [2021-11-25 20:10:18,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:10:18,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:10:18,438 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:10:18,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [178465964] [2021-11-25 20:10:18,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:10:18,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:10:18,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:10:18,442 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:10:18,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:10:18,483 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:10:18,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:10:18,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:10:18,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:10:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 20:10:18,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:10:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-25 20:10:18,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:10:18,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371108871] [2021-11-25 20:10:18,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:10:18,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178465964] [2021-11-25 20:10:18,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178465964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:10:18,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [437549787] [2021-11-25 20:10:18,812 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 20:10:18,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:10:18,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:10:18,813 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:10:18,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:10:24,477 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2021-11-25 20:10:24,559 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:10:24,574 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:10:27,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3927#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 20:10:27,865 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:10:27,865 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:10:27,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 9 [2021-11-25 20:10:27,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731816787] [2021-11-25 20:10:27,866 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:10:27,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:10:27,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:10:27,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:10:27,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=579, Unknown=0, NotChecked=0, Total=702 [2021-11-25 20:10:27,868 INFO L87 Difference]: Start difference. First operand 115 states and 151 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-25 20:10:28,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:10:28,024 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2021-11-25 20:10:28,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:10:28,024 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 65 [2021-11-25 20:10:28,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:10:28,026 INFO L225 Difference]: With dead ends: 122 [2021-11-25 20:10:28,026 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 20:10:28,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 157 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=139, Invalid=673, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:10:28,027 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:10:28,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 128 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:10:28,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 20:10:28,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2021-11-25 20:10:28,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-25 20:10:28,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 156 transitions. [2021-11-25 20:10:28,050 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 156 transitions. Word has length 65 [2021-11-25 20:10:28,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:10:28,051 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 156 transitions. [2021-11-25 20:10:28,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-25 20:10:28,051 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 156 transitions. [2021-11-25 20:10:28,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 20:10:28,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:10:28,052 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:10:28,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:10:28,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:10:28,253 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:10:28,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:10:28,254 INFO L85 PathProgramCache]: Analyzing trace with hash -2003369438, now seen corresponding path program 1 times [2021-11-25 20:10:28,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:10:28,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589975847] [2021-11-25 20:10:28,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:10:28,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:10:28,264 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:10:28,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [120368765] [2021-11-25 20:10:28,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:10:28,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:10:28,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:10:28,265 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:10:28,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:10:28,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:10:28,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:10:28,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:10:28,830 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 20:10:28,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:10:29,486 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-25 20:10:29,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:10:29,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589975847] [2021-11-25 20:10:29,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:10:29,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120368765] [2021-11-25 20:10:29,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120368765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:10:29,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151281728] [2021-11-25 20:10:29,489 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:10:29,489 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:10:29,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:10:29,490 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:10:29,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:10:33,093 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 20:10:33,096 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:10:33,112 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:11:11,266 WARN L227 SmtUtils]: Spent 31.79s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:11:25,795 WARN L227 SmtUtils]: Spent 13.80s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:11:35,567 WARN L227 SmtUtils]: Spent 6.13s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:11:53,545 WARN L227 SmtUtils]: Spent 17.13s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:12:16,991 WARN L227 SmtUtils]: Spent 17.82s on a formula simplification. DAG size of input: 183 DAG size of output: 92 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:12:16,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4775#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 20:12:16,992 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:12:16,992 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:12:16,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2021-11-25 20:12:16,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327476257] [2021-11-25 20:12:16,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:12:16,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:12:16,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:12:16,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:12:16,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1152, Unknown=1, NotChecked=0, Total=1332 [2021-11-25 20:12:16,994 INFO L87 Difference]: Start difference. First operand 120 states and 156 transitions. Second operand has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 20:12:22,361 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-25 20:12:27,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:12:27,350 INFO L93 Difference]: Finished difference Result 203 states and 282 transitions. [2021-11-25 20:12:27,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:12:27,351 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 74 [2021-11-25 20:12:27,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:12:27,354 INFO L225 Difference]: With dead ends: 203 [2021-11-25 20:12:27,354 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 20:12:27,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 108.5s TimeCoverageRelationStatistics Valid=412, Invalid=2667, Unknown=1, NotChecked=0, Total=3080 [2021-11-25 20:12:27,357 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 65 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:12:27,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 426 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2021-11-25 20:12:27,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 20:12:27,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 191. [2021-11-25 20:12:27,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 104 states have internal predecessors, (124), 73 states have call successors, (73), 15 states have call predecessors, (73), 15 states have return successors, (72), 71 states have call predecessors, (72), 72 states have call successors, (72) [2021-11-25 20:12:27,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 269 transitions. [2021-11-25 20:12:27,402 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 269 transitions. Word has length 74 [2021-11-25 20:12:27,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:12:27,402 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 269 transitions. [2021-11-25 20:12:27,403 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 15 states have internal predecessors, (29), 9 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 20:12:27,403 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 269 transitions. [2021-11-25 20:12:27,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 20:12:27,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:12:27,404 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:12:27,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:12:27,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:12:27,621 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:12:27,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:12:27,621 INFO L85 PathProgramCache]: Analyzing trace with hash -134461569, now seen corresponding path program 1 times [2021-11-25 20:12:27,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:12:27,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789329415] [2021-11-25 20:12:27,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:27,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:12:27,634 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:12:27,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2060318843] [2021-11-25 20:12:27,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:12:27,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:12:27,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:12:27,639 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:12:27,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:12:27,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:12:27,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:12:27,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:12:28,021 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 35 proven. 15 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2021-11-25 20:12:28,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:12:28,267 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2021-11-25 20:12:28,267 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:12:28,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789329415] [2021-11-25 20:12:28,268 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:12:28,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060318843] [2021-11-25 20:12:28,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060318843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:12:28,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [687701789] [2021-11-25 20:12:28,270 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:12:28,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:12:28,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:12:28,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:12:28,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:12:32,269 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2021-11-25 20:12:32,271 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:12:32,284 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:13:12,471 WARN L227 SmtUtils]: Spent 35.95s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:13:42,992 WARN L227 SmtUtils]: Spent 29.89s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:13:56,424 WARN L227 SmtUtils]: Spent 11.00s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:14:17,804 WARN L227 SmtUtils]: Spent 20.50s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:14:59,499 WARN L227 SmtUtils]: Spent 39.23s on a formula simplification. DAG size of input: 183 DAG size of output: 91 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:14:59,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5939#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0))' at error location [2021-11-25 20:14:59,957 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:14:59,957 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:14:59,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-25 20:14:59,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544452150] [2021-11-25 20:14:59,957 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:14:59,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 20:14:59,958 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:14:59,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 20:14:59,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:14:59,959 INFO L87 Difference]: Start difference. First operand 191 states and 269 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 20:15:01,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:15:01,125 INFO L93 Difference]: Finished difference Result 224 states and 306 transitions. [2021-11-25 20:15:01,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:15:01,126 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 79 [2021-11-25 20:15:01,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:15:01,128 INFO L225 Difference]: With dead ends: 224 [2021-11-25 20:15:01,128 INFO L226 Difference]: Without dead ends: 218 [2021-11-25 20:15:01,129 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 203 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 148.1s TimeCoverageRelationStatistics Valid=238, Invalid=1654, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:15:01,130 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 36 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 383 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:15:01,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 383 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 20:15:01,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-11-25 20:15:01,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 216. [2021-11-25 20:15:01,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 122 states have (on average 1.1639344262295082) internal successors, (142), 125 states have internal predecessors, (142), 75 states have call successors, (75), 18 states have call predecessors, (75), 18 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 20:15:01,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 291 transitions. [2021-11-25 20:15:01,179 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 291 transitions. Word has length 79 [2021-11-25 20:15:01,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:15:01,180 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 291 transitions. [2021-11-25 20:15:01,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 14 states have internal predecessors, (33), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-11-25 20:15:01,180 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 291 transitions. [2021-11-25 20:15:01,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 20:15:01,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:15:01,182 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:15:01,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:15:01,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:01,406 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:15:01,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:15:01,406 INFO L85 PathProgramCache]: Analyzing trace with hash 145896886, now seen corresponding path program 1 times [2021-11-25 20:15:01,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:15:01,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332963675] [2021-11-25 20:15:01,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:01,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:15:01,415 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:15:01,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [299786346] [2021-11-25 20:15:01,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:15:01,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:15:01,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:15:01,417 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:15:01,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:15:01,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:15:01,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 20:15:01,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:15:02,273 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 59 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-25 20:15:02,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:15:07,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:15:07,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332963675] [2021-11-25 20:15:07,427 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:15:07,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299786346] [2021-11-25 20:15:07,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299786346] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:15:07,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157641093] [2021-11-25 20:15:07,429 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:15:07,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:15:07,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:15:07,430 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:15:07,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:15:11,488 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 20:15:11,497 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:15:11,512 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:15:50,100 WARN L227 SmtUtils]: Spent 35.52s on a formula simplification. DAG size of input: 181 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:00,277 WARN L227 SmtUtils]: Spent 9.46s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:13,583 WARN L227 SmtUtils]: Spent 7.63s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:26,287 WARN L227 SmtUtils]: Spent 11.46s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:16:26,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7073#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:16:26,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:16:26,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:16:26,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-11-25 20:16:26,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511110968] [2021-11-25 20:16:26,400 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:16:26,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 20:16:26,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:26,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 20:16:26,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1086, Unknown=2, NotChecked=0, Total=1260 [2021-11-25 20:16:26,402 INFO L87 Difference]: Start difference. First operand 216 states and 291 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-25 20:16:26,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:26,928 INFO L93 Difference]: Finished difference Result 228 states and 301 transitions. [2021-11-25 20:16:26,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:16:26,928 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2021-11-25 20:16:26,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:26,930 INFO L225 Difference]: With dead ends: 228 [2021-11-25 20:16:26,931 INFO L226 Difference]: Without dead ends: 226 [2021-11-25 20:16:26,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 171 SyntacticMatches, 14 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 818 ImplicationChecksByTransitivity, 80.0s TimeCoverageRelationStatistics Valid=195, Invalid=1285, Unknown=2, NotChecked=0, Total=1482 [2021-11-25 20:16:26,932 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 21 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:26,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 233 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:16:26,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-25 20:16:26,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 224. [2021-11-25 20:16:26,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 128 states have (on average 1.15625) internal successors, (148), 131 states have internal predecessors, (148), 75 states have call successors, (75), 20 states have call predecessors, (75), 20 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2021-11-25 20:16:26,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 297 transitions. [2021-11-25 20:16:26,987 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 297 transitions. Word has length 90 [2021-11-25 20:16:26,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:26,988 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 297 transitions. [2021-11-25 20:16:26,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 5 states have call predecessors, (17), 6 states have call successors, (17) [2021-11-25 20:16:26,989 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 297 transitions. [2021-11-25 20:16:26,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 20:16:26,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:26,990 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:27,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-25 20:16:27,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 20:16:27,192 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:27,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:27,193 INFO L85 PathProgramCache]: Analyzing trace with hash 2106799636, now seen corresponding path program 2 times [2021-11-25 20:16:27,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:27,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905407472] [2021-11-25 20:16:27,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:27,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:27,217 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:16:27,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2031759714] [2021-11-25 20:16:27,230 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:27,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:27,230 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:27,234 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:27,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:16:27,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:16:27,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:27,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 20:16:27,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:27,412 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-25 20:16:27,412 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:16:27,412 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:27,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905407472] [2021-11-25 20:16:27,412 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:16:27,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031759714] [2021-11-25 20:16:27,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031759714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:16:27,413 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:16:27,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:16:27,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809185641] [2021-11-25 20:16:27,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:16:27,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:16:27,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:16:27,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:16:27,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:16:27,414 INFO L87 Difference]: Start difference. First operand 224 states and 297 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-25 20:16:27,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:16:27,495 INFO L93 Difference]: Finished difference Result 306 states and 407 transitions. [2021-11-25 20:16:27,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:16:27,496 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-25 20:16:27,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:16:27,498 INFO L225 Difference]: With dead ends: 306 [2021-11-25 20:16:27,498 INFO L226 Difference]: Without dead ends: 209 [2021-11-25 20:16:27,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:16:27,500 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 6 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:16:27,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 150 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:16:27,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-25 20:16:27,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 184. [2021-11-25 20:16:27,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 106 states have (on average 1.1132075471698113) internal successors, (118), 109 states have internal predecessors, (118), 57 states have call successors, (57), 20 states have call predecessors, (57), 20 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-25 20:16:27,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 231 transitions. [2021-11-25 20:16:27,537 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 231 transitions. Word has length 99 [2021-11-25 20:16:27,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:16:27,538 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 231 transitions. [2021-11-25 20:16:27,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-25 20:16:27,538 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 231 transitions. [2021-11-25 20:16:27,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-25 20:16:27,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:16:27,540 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:16:27,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:16:27,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 20:16:27,750 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:16:27,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:16:27,751 INFO L85 PathProgramCache]: Analyzing trace with hash 173280102, now seen corresponding path program 2 times [2021-11-25 20:16:27,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:16:27,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002379586] [2021-11-25 20:16:27,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:16:27,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:16:27,761 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:16:27,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [568440629] [2021-11-25 20:16:27,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:16:27,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:16:27,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:16:27,770 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:16:27,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:16:27,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:16:27,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:16:27,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 20:16:27,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:16:28,096 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 57 proven. 35 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2021-11-25 20:16:28,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:16:28,308 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 73 proven. 7 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-25 20:16:28,309 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:16:28,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002379586] [2021-11-25 20:16:28,309 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:16:28,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568440629] [2021-11-25 20:16:28,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568440629] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:16:28,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576441389] [2021-11-25 20:16:28,311 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:16:28,311 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:16:28,311 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:16:28,311 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:16:28,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:16:31,446 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2021-11-25 20:16:31,453 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:16:31,466 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:00,734 WARN L227 SmtUtils]: Spent 23.62s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:17:20,348 WARN L227 SmtUtils]: Spent 19.40s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:17:32,859 WARN L227 SmtUtils]: Spent 10.22s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:17:58,248 WARN L227 SmtUtils]: Spent 24.35s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:17:58,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9495#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:17:58,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:58,440 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:58,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-25 20:17:58,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778123793] [2021-11-25 20:17:58,441 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:58,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:17:58,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:58,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:17:58,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=968, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:17:58,443 INFO L87 Difference]: Start difference. First operand 184 states and 231 transitions. Second operand has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-25 20:18:00,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:00,112 INFO L93 Difference]: Finished difference Result 230 states and 301 transitions. [2021-11-25 20:18:00,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:18:00,113 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 105 [2021-11-25 20:18:00,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:00,115 INFO L225 Difference]: With dead ends: 230 [2021-11-25 20:18:00,115 INFO L226 Difference]: Without dead ends: 228 [2021-11-25 20:18:00,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 265 SyntacticMatches, 16 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 88.2s TimeCoverageRelationStatistics Valid=215, Invalid=1507, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:18:00,117 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 38 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 291 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:00,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 291 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:18:00,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2021-11-25 20:18:00,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 188. [2021-11-25 20:18:00,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 109 states have (on average 1.110091743119266) internal successors, (121), 112 states have internal predecessors, (121), 57 states have call successors, (57), 21 states have call predecessors, (57), 21 states have return successors, (56), 54 states have call predecessors, (56), 56 states have call successors, (56) [2021-11-25 20:18:00,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 234 transitions. [2021-11-25 20:18:00,163 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 234 transitions. Word has length 105 [2021-11-25 20:18:00,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:00,164 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 234 transitions. [2021-11-25 20:18:00,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 13 states have internal predecessors, (41), 8 states have call successors, (26), 2 states have call predecessors, (26), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2021-11-25 20:18:00,164 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 234 transitions. [2021-11-25 20:18:00,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-25 20:18:00,166 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:00,166 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:00,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:00,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:18:00,381 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:00,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:00,381 INFO L85 PathProgramCache]: Analyzing trace with hash -425141716, now seen corresponding path program 3 times [2021-11-25 20:18:00,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:00,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165429661] [2021-11-25 20:18:00,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:00,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:00,391 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:18:00,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2096381976] [2021-11-25 20:18:00,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:18:00,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:00,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:00,394 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:00,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:18:00,448 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:18:00,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:18:00,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 20:18:00,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:18:01,113 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 77 proven. 55 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-25 20:18:01,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:18:01,428 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:18:01,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165429661] [2021-11-25 20:18:01,428 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:18:01,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096381976] [2021-11-25 20:18:01,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096381976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:18:01,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1149105673] [2021-11-25 20:18:01,430 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:18:01,430 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:18:01,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:18:01,431 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:18:01,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:18:05,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 20:18:05,060 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:18:05,072 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:18:34,031 WARN L227 SmtUtils]: Spent 23.97s on a formula simplification. DAG size of input: 181 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:18:54,546 WARN L227 SmtUtils]: Spent 19.92s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:03,673 WARN L227 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:18,212 WARN L227 SmtUtils]: Spent 12.87s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:19:18,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10614#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:19:18,282 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:19:18,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:19:18,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-25 20:19:18,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461843754] [2021-11-25 20:19:18,283 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:19:18,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 20:19:18,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:19:18,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 20:19:18,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1222, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:19:18,284 INFO L87 Difference]: Start difference. First operand 188 states and 234 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-11-25 20:19:18,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:19:18,686 INFO L93 Difference]: Finished difference Result 221 states and 279 transitions. [2021-11-25 20:19:18,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 20:19:18,693 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) Word has length 107 [2021-11-25 20:19:18,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:19:18,695 INFO L225 Difference]: With dead ends: 221 [2021-11-25 20:19:18,695 INFO L226 Difference]: Without dead ends: 219 [2021-11-25 20:19:18,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 195 SyntacticMatches, 17 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 73.5s TimeCoverageRelationStatistics Valid=208, Invalid=1432, Unknown=0, NotChecked=0, Total=1640 [2021-11-25 20:19:18,697 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 26 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:19:18,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 243 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:19:18,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-25 20:19:18,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 199. [2021-11-25 20:19:18,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 116 states have (on average 1.103448275862069) internal successors, (128), 120 states have internal predecessors, (128), 60 states have call successors, (60), 22 states have call predecessors, (60), 22 states have return successors, (59), 56 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-25 20:19:18,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 247 transitions. [2021-11-25 20:19:18,745 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 247 transitions. Word has length 107 [2021-11-25 20:19:18,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:19:18,745 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 247 transitions. [2021-11-25 20:19:18,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-11-25 20:19:18,746 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 247 transitions. [2021-11-25 20:19:18,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-25 20:19:18,748 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:19:18,748 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:19:18,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:19:18,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 20:19:18,962 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:19:18,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:19:18,963 INFO L85 PathProgramCache]: Analyzing trace with hash -743497349, now seen corresponding path program 4 times [2021-11-25 20:19:18,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:19:18,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358484850] [2021-11-25 20:19:18,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:19:18,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:19:18,973 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:19:18,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1813643715] [2021-11-25 20:19:18,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:19:18,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:19:18,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:19:18,978 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:19:18,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:19:19,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:19:19,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-25 20:19:19,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:19:19,801 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 90 proven. 95 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-11-25 20:19:19,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:19:20,394 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 120 proven. 32 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-25 20:19:20,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:19:20,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358484850] [2021-11-25 20:19:20,395 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:19:20,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813643715] [2021-11-25 20:19:20,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813643715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:19:20,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222038066] [2021-11-25 20:19:20,397 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:19:20,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:19:20,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:19:20,398 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:19:20,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:19:23,491 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 for LOIs [2021-11-25 20:19:23,499 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:19:23,511 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:20:03,235 WARN L227 SmtUtils]: Spent 32.26s on a formula simplification. DAG size of input: 185 DAG size of output: 156 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:20:26,207 WARN L227 SmtUtils]: Spent 22.32s on a formula simplification. DAG size of input: 96 DAG size of output: 88 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:20:38,251 WARN L227 SmtUtils]: Spent 7.45s on a formula simplification that was a NOOP. DAG size: 82 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:21:04,753 WARN L227 SmtUtils]: Spent 25.39s on a formula simplification. DAG size of input: 83 DAG size of output: 81 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:21:05,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11955#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:21:05,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:21:05,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:21:05,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 21 [2021-11-25 20:21:05,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521530422] [2021-11-25 20:21:05,158 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:21:05,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 20:21:05,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:21:05,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 20:21:05,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=1433, Unknown=1, NotChecked=0, Total=1640 [2021-11-25 20:21:05,161 INFO L87 Difference]: Start difference. First operand 199 states and 247 transitions. Second operand has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 20:21:08,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:21:08,178 INFO L93 Difference]: Finished difference Result 254 states and 322 transitions. [2021-11-25 20:21:08,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:21:08,179 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) Word has length 110 [2021-11-25 20:21:08,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:21:08,181 INFO L225 Difference]: With dead ends: 254 [2021-11-25 20:21:08,181 INFO L226 Difference]: Without dead ends: 252 [2021-11-25 20:21:08,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 272 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1392 ImplicationChecksByTransitivity, 102.6s TimeCoverageRelationStatistics Valid=292, Invalid=2157, Unknown=1, NotChecked=0, Total=2450 [2021-11-25 20:21:08,183 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 49 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 549 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:21:08,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 379 Invalid, 685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 549 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-25 20:21:08,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-25 20:21:08,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 217. [2021-11-25 20:21:08,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 126 states have (on average 1.1111111111111112) internal successors, (140), 128 states have internal predecessors, (140), 65 states have call successors, (65), 25 states have call predecessors, (65), 25 states have return successors, (64), 63 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-25 20:21:08,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 269 transitions. [2021-11-25 20:21:08,253 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 269 transitions. Word has length 110 [2021-11-25 20:21:08,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:21:08,254 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 269 transitions. [2021-11-25 20:21:08,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 16 states have internal predecessors, (42), 14 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 13 states have call predecessors, (32), 14 states have call successors, (32) [2021-11-25 20:21:08,255 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 269 transitions. [2021-11-25 20:21:08,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 20:21:08,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:21:08,257 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:21:08,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:21:08,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:21:08,470 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:21:08,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:21:08,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1680324149, now seen corresponding path program 5 times [2021-11-25 20:21:08,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:21:08,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007074627] [2021-11-25 20:21:08,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:21:08,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:21:08,481 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:21:08,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2070971857] [2021-11-25 20:21:08,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:21:08,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:21:08,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:21:08,485 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:21:08,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:21:08,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:21:08,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:21:08,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:21:08,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:21:10,394 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 71 proven. 41 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-25 20:21:10,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:21:12,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:21:12,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007074627] [2021-11-25 20:21:12,185 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:21:12,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070971857] [2021-11-25 20:21:12,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070971857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:21:12,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1016116404] [2021-11-25 20:21:12,187 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:21:12,187 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:21:12,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:21:12,187 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:21:12,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:21:16,052 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 30 for LOIs [2021-11-25 20:21:16,061 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2021-11-25 20:21:16,076 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:21:58,555 WARN L227 SmtUtils]: Spent 37.29s on a formula simplification. DAG size of input: 181 DAG size of output: 152 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:22:10,466 WARN L227 SmtUtils]: Spent 10.81s on a formula simplification. DAG size of input: 88 DAG size of output: 87 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:22:27,775 WARN L227 SmtUtils]: Spent 13.83s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:22:39,318 WARN L227 SmtUtils]: Spent 9.52s on a formula simplification that was a NOOP. DAG size: 77 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 20:22:39,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13140#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 20:22:39,474 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:22:39,474 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:22:39,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-11-25 20:22:39,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170163310] [2021-11-25 20:22:39,474 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-25 20:22:39,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:22:39,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:22:39,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:22:39,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1496, Unknown=0, NotChecked=0, Total=1722 [2021-11-25 20:22:39,476 INFO L87 Difference]: Start difference. First operand 217 states and 269 transitions. Second operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-25 20:22:40,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:22:40,845 INFO L93 Difference]: Finished difference Result 258 states and 320 transitions. [2021-11-25 20:22:40,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 20:22:40,846 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) Word has length 112 [2021-11-25 20:22:40,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:22:40,848 INFO L225 Difference]: With dead ends: 258 [2021-11-25 20:22:40,848 INFO L226 Difference]: Without dead ends: 256 [2021-11-25 20:22:40,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 190 SyntacticMatches, 18 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 85.4s TimeCoverageRelationStatistics Valid=282, Invalid=1974, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 20:22:40,850 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 44 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:22:40,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 318 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 615 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 20:22:40,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-25 20:22:40,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 228. [2021-11-25 20:22:40,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 133 states have (on average 1.105263157894737) internal successors, (147), 136 states have internal predecessors, (147), 68 states have call successors, (68), 26 states have call predecessors, (68), 26 states have return successors, (67), 65 states have call predecessors, (67), 67 states have call successors, (67) [2021-11-25 20:22:40,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 282 transitions. [2021-11-25 20:22:40,921 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 282 transitions. Word has length 112 [2021-11-25 20:22:40,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:22:40,922 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 282 transitions. [2021-11-25 20:22:40,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2021-11-25 20:22:40,922 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 282 transitions. [2021-11-25 20:22:40,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 20:22:40,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:22:40,923 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:22:40,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 20:22:41,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 20:22:41,124 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:22:41,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:22:41,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1506060358, now seen corresponding path program 6 times [2021-11-25 20:22:41,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:22:41,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450013210] [2021-11-25 20:22:41,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:22:41,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:22:41,136 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:22:41,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1526935865] [2021-11-25 20:22:41,137 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:22:41,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:22:41,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:22:41,138 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:22:41,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_17b9e740-d028-4ea0-8c0c-c3cb129655ff/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:22:41,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:22:41,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:22:41,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-25 20:22:41,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:22:43,234 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 94 proven. 126 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-11-25 20:22:43,234 INFO L328 TraceCheckSpWp]: Computing backward predicates...