./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b4ec56b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9 --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 5bfe5681b6d73d5859a119345279b9da165675f4eb4d814fdf24f92881f7a27f --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-6b4ec56 [2022-11-20 20:04:55,491 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-20 20:04:55,493 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-20 20:04:55,517 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-20 20:04:55,517 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-20 20:04:55,521 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-20 20:04:55,526 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-20 20:04:55,530 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-20 20:04:55,534 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-20 20:04:55,537 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-20 20:04:55,540 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-20 20:04:55,541 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-20 20:04:55,542 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-20 20:04:55,543 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-20 20:04:55,544 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-20 20:04:55,545 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-20 20:04:55,545 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-20 20:04:55,546 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-20 20:04:55,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-20 20:04:55,549 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-20 20:04:55,555 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-20 20:04:55,558 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-20 20:04:55,560 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-20 20:04:55,561 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-20 20:04:55,574 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-20 20:04:55,574 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-20 20:04:55,575 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-20 20:04:55,576 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-20 20:04:55,576 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-20 20:04:55,577 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-20 20:04:55,577 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-20 20:04:55,578 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-20 20:04:55,578 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-20 20:04:55,579 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-20 20:04:55,580 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-20 20:04:55,580 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-20 20:04:55,581 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-20 20:04:55,581 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-20 20:04:55,581 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-20 20:04:55,582 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-20 20:04:55,583 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-20 20:04:55,588 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-20 20:04:55,628 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-20 20:04:55,628 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-20 20:04:55,629 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-20 20:04:55,629 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-20 20:04:55,630 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-20 20:04:55,630 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-20 20:04:55,630 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-20 20:04:55,633 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-20 20:04:55,633 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-20 20:04:55,633 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-20 20:04:55,634 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-20 20:04:55,634 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-20 20:04:55,635 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-20 20:04:55,635 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-20 20:04:55,635 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-20 20:04:55,635 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-20 20:04:55,635 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-20 20:04:55,635 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-20 20:04:55,636 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-20 20:04:55,636 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-20 20:04:55,637 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-20 20:04:55,637 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-20 20:04:55,637 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-20 20:04:55,637 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-20 20:04:55,638 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-20 20:04:55,639 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-20 20:04:55,639 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-20 20:04:55,639 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:04:55,639 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-20 20:04:55,640 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-20 20:04:55,641 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-20 20:04:55,641 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5bfe5681b6d73d5859a119345279b9da165675f4eb4d814fdf24f92881f7a27f [2022-11-20 20:04:55,886 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-20 20:04:55,911 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-20 20:04:55,914 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-20 20:04:55,915 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-20 20:04:55,916 INFO L275 PluginConnector]: CDTParser initialized [2022-11-20 20:04:55,918 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/../../sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c [2022-11-20 20:04:58,986 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-20 20:04:59,238 INFO L351 CDTParser]: Found 1 translation units. [2022-11-20 20:04:59,238 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c [2022-11-20 20:04:59,246 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/data/bf432cc33/35ee24184c22466badefc615965eee75/FLAG4d28bc541 [2022-11-20 20:04:59,263 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/data/bf432cc33/35ee24184c22466badefc615965eee75 [2022-11-20 20:04:59,269 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-20 20:04:59,271 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-20 20:04:59,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-20 20:04:59,275 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-20 20:04:59,279 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-20 20:04:59,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,282 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@112a881f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59, skipping insertion in model container [2022-11-20 20:04:59,282 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,291 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-20 20:04:59,313 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-20 20:04:59,450 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c[458,471] [2022-11-20 20:04:59,469 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:04:59,480 INFO L203 MainTranslator]: Completed pre-run [2022-11-20 20:04:59,493 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/sv-benchmarks/c/nla-digbench-scaling/ps6-ll_unwindbound50.c[458,471] [2022-11-20 20:04:59,500 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-20 20:04:59,523 INFO L208 MainTranslator]: Completed translation [2022-11-20 20:04:59,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59 WrapperNode [2022-11-20 20:04:59,525 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-20 20:04:59,526 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-20 20:04:59,526 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-20 20:04:59,526 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-20 20:04:59,534 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,541 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,565 INFO L138 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2022-11-20 20:04:59,566 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-20 20:04:59,567 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-20 20:04:59,567 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-20 20:04:59,567 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-20 20:04:59,576 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,577 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,589 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,590 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,592 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,596 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,603 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,609 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-20 20:04:59,610 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-20 20:04:59,610 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-20 20:04:59,610 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-20 20:04:59,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (1/1) ... [2022-11-20 20:04:59,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-20 20:04:59,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:04:59,651 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-20 20:04:59,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-20 20:04:59,695 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-20 20:04:59,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-20 20:04:59,696 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-20 20:04:59,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-20 20:04:59,696 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-20 20:04:59,697 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-20 20:04:59,770 INFO L235 CfgBuilder]: Building ICFG [2022-11-20 20:04:59,772 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-20 20:04:59,964 INFO L276 CfgBuilder]: Performing block encoding [2022-11-20 20:04:59,999 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-20 20:04:59,999 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-20 20:05:00,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:05:00 BoogieIcfgContainer [2022-11-20 20:05:00,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-20 20:05:00,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-20 20:05:00,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-20 20:05:00,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-20 20:05:00,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 08:04:59" (1/3) ... [2022-11-20 20:05:00,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74a41d18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:05:00, skipping insertion in model container [2022-11-20 20:05:00,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 08:04:59" (2/3) ... [2022-11-20 20:05:00,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74a41d18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 08:05:00, skipping insertion in model container [2022-11-20 20:05:00,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 08:05:00" (3/3) ... [2022-11-20 20:05:00,010 INFO L112 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound50.c [2022-11-20 20:05:00,032 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-20 20:05:00,032 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-20 20:05:00,128 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-20 20:05:00,135 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6ddb6fd0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-20 20:05:00,135 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-20 20:05:00,143 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 20:05:00,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-20 20:05:00,151 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:00,152 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-20 20:05:00,152 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:00,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:00,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1749202120, now seen corresponding path program 1 times [2022-11-20 20:05:00,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:00,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657887525] [2022-11-20 20:05:00,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:00,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:00,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:00,300 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:00,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657887525] [2022-11-20 20:05:00,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-20 20:05:00,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313099906] [2022-11-20 20:05:00,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:00,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:00,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:00,306 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:00,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-20 20:05:00,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:00,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-20 20:05:00,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:00,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:00,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:05:00,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313099906] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:05:00,436 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:05:00,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-20 20:05:00,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496149630] [2022-11-20 20:05:00,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:05:00,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-20 20:05:00,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:00,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-20 20:05:00,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 20:05:00,473 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:00,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:00,498 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2022-11-20 20:05:00,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-20 20:05:00,500 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-20 20:05:00,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:00,508 INFO L225 Difference]: With dead ends: 29 [2022-11-20 20:05:00,508 INFO L226 Difference]: Without dead ends: 13 [2022-11-20 20:05:00,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-20 20:05:00,515 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:00,516 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:05:00,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-20 20:05:00,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-20 20:05:00,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:05:00,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-20 20:05:00,550 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-11-20 20:05:00,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:00,551 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-20 20:05:00,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:00,551 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-20 20:05:00,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:05:00,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:00,552 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:00,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:00,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:00,755 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:00,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:00,757 INFO L85 PathProgramCache]: Analyzing trace with hash 1208885392, now seen corresponding path program 1 times [2022-11-20 20:05:00,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:00,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114970236] [2022-11-20 20:05:00,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:00,759 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:00,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:00,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:00,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114970236] [2022-11-20 20:05:00,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-20 20:05:00,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15288667] [2022-11-20 20:05:00,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:00,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:00,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:00,832 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:00,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-20 20:05:00,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:00,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-20 20:05:00,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:00,977 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:00,978 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:05:00,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15288667] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:05:00,978 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:05:00,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-20 20:05:00,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424402719] [2022-11-20 20:05:00,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:05:00,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-20 20:05:00,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:00,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-20 20:05:00,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:05:00,988 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:01,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:01,017 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-20 20:05:01,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-20 20:05:01,019 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:05:01,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:01,020 INFO L225 Difference]: With dead ends: 23 [2022-11-20 20:05:01,020 INFO L226 Difference]: Without dead ends: 15 [2022-11-20 20:05:01,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-20 20:05:01,022 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:01,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:05:01,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-20 20:05:01,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-20 20:05:01,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:05:01,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-20 20:05:01,027 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2022-11-20 20:05:01,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:01,027 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-20 20:05:01,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:01,028 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-20 20:05:01,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-20 20:05:01,028 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:01,029 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:01,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:01,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:01,236 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:01,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:01,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1210672852, now seen corresponding path program 1 times [2022-11-20 20:05:01,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:01,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200317678] [2022-11-20 20:05:01,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:01,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:01,250 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:01,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1718046103] [2022-11-20 20:05:01,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:01,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:01,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:01,252 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:01,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-20 20:05:01,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:01,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-20 20:05:01,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:01,374 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:01,375 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-20 20:05:01,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:01,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200317678] [2022-11-20 20:05:01,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:01,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718046103] [2022-11-20 20:05:01,376 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718046103] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-20 20:05:01,376 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-20 20:05:01,376 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-20 20:05:01,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364365961] [2022-11-20 20:05:01,377 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:05:01,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:05:01,378 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:01,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:05:01,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-20 20:05:01,379 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:01,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:01,666 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-20 20:05:01,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-20 20:05:01,666 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-20 20:05:01,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:01,667 INFO L225 Difference]: With dead ends: 25 [2022-11-20 20:05:01,667 INFO L226 Difference]: Without dead ends: 21 [2022-11-20 20:05:01,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-20 20:05:01,669 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:01,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 41 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:05:01,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-20 20:05:01,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-20 20:05:01,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 20:05:01,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-20 20:05:01,677 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2022-11-20 20:05:01,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:01,677 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-20 20:05:01,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-20 20:05:01,678 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-20 20:05:01,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:05:01,679 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:01,679 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:01,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-20 20:05:01,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-20 20:05:01,884 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:01,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:01,885 INFO L85 PathProgramCache]: Analyzing trace with hash 479296502, now seen corresponding path program 1 times [2022-11-20 20:05:01,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:01,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83143917] [2022-11-20 20:05:01,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:01,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:01,900 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:01,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1745193042] [2022-11-20 20:05:01,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:01,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:01,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:01,903 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:01,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-20 20:05:01,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:02,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-20 20:05:02,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:02,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:02,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:05:02,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:02,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:02,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83143917] [2022-11-20 20:05:02,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:02,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745193042] [2022-11-20 20:05:02,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745193042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:05:02,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225568216] [2022-11-20 20:05:02,144 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-20 20:05:02,144 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:05:02,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:05:02,153 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:05:02,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:05:03,290 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 68 for LOIs [2022-11-20 20:05:03,410 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:05:12,808 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:05:12,808 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:05:12,808 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:05:12,808 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-20 20:05:12,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656588730] [2022-11-20 20:05:12,809 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:05:12,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-20 20:05:12,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:12,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-20 20:05:12,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=224, Unknown=1, NotChecked=0, Total=272 [2022-11-20 20:05:12,811 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:05:12,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:12,943 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2022-11-20 20:05:12,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 20:05:12,944 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-20 20:05:12,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:12,945 INFO L225 Difference]: With dead ends: 55 [2022-11-20 20:05:12,945 INFO L226 Difference]: Without dead ends: 47 [2022-11-20 20:05:12,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=67, Invalid=312, Unknown=1, NotChecked=0, Total=380 [2022-11-20 20:05:12,947 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:12,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 86 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:05:12,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-20 20:05:12,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-20 20:05:12,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:05:12,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2022-11-20 20:05:12,958 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2022-11-20 20:05:12,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:12,958 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2022-11-20 20:05:12,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-20 20:05:12,959 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2022-11-20 20:05:12,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-20 20:05:12,959 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:12,960 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:12,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-11-20 20:05:13,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:13,165 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:13,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:13,166 INFO L85 PathProgramCache]: Analyzing trace with hash 481083962, now seen corresponding path program 1 times [2022-11-20 20:05:13,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:13,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195970298] [2022-11-20 20:05:13,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:13,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:13,184 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:13,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [950234207] [2022-11-20 20:05:13,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:13,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:13,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:13,203 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:13,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-20 20:05:13,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:13,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-20 20:05:13,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:13,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-20 20:05:13,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:05:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-20 20:05:13,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:05:13,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195970298] [2022-11-20 20:05:13,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:05:13,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950234207] [2022-11-20 20:05:13,426 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950234207] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-20 20:05:13,426 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:05:13,426 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2022-11-20 20:05:13,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895882215] [2022-11-20 20:05:13,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-20 20:05:13,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-20 20:05:13,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:05:13,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-20 20:05:13,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-20 20:05:13,429 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:05:13,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:05:13,489 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2022-11-20 20:05:13,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-20 20:05:13,489 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), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-20 20:05:13,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:05:13,490 INFO L225 Difference]: With dead ends: 57 [2022-11-20 20:05:13,491 INFO L226 Difference]: Without dead ends: 49 [2022-11-20 20:05:13,491 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-11-20 20:05:13,492 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 8 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-20 20:05:13,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 26 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-20 20:05:13,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-11-20 20:05:13,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2022-11-20 20:05:13,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:05:13,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2022-11-20 20:05:13,510 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 15 [2022-11-20 20:05:13,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:05:13,510 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2022-11-20 20:05:13,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-20 20:05:13,511 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2022-11-20 20:05:13,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-20 20:05:13,512 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:05:13,512 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:05:13,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-20 20:05:13,718 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:13,718 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:05:13,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:05:13,719 INFO L85 PathProgramCache]: Analyzing trace with hash 669026573, now seen corresponding path program 1 times [2022-11-20 20:05:13,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:05:13,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904180051] [2022-11-20 20:05:13,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:13,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:05:13,729 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:05:13,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1931750138] [2022-11-20 20:05:13,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:05:13,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:05:13,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:05:13,731 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:05:13,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-20 20:05:13,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:05:13,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-20 20:05:13,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:05:13,965 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-20 20:05:13,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:05:18,067 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) .cse0) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))))) is different from false [2022-11-20 20:05:38,171 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19|))) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 6) .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 7) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 10)) 12) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14|) .cse0))))) is different from true [2022-11-20 20:05:56,278 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19|))) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 6) .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 7) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| 10)) 12) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_19| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_14|) .cse0)))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-20 20:06:20,592 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))))) is different from false [2022-11-20 20:06:22,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:06:22,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904180051] [2022-11-20 20:06:22,627 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:06:22,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931750138] [2022-11-20 20:06:22,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931750138] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:06:22,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323192575] [2022-11-20 20:06:22,630 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:06:22,630 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:06:22,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:06:22,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:06:22,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:06:23,352 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:06:23,358 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:06:23,862 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '887#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:06:23,862 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:06:23,862 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:06:23,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-11-20 20:06:23,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644060791] [2022-11-20 20:06:23,862 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:06:23,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-20 20:06:23,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:06:23,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-20 20:06:23,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=352, Unknown=9, NotChecked=164, Total=600 [2022-11-20 20:06:23,864 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 20:06:24,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:24,047 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-11-20 20:06:24,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-20 20:06:24,049 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2022-11-20 20:06:24,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:24,051 INFO L225 Difference]: With dead ends: 48 [2022-11-20 20:06:24,051 INFO L226 Difference]: Without dead ends: 42 [2022-11-20 20:06:24,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 20.8s TimeCoverageRelationStatistics Valid=95, Invalid=464, Unknown=9, NotChecked=188, Total=756 [2022-11-20 20:06:24,053 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:24,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 57 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:06:24,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-20 20:06:24,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-20 20:06:24,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 20:06:24,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2022-11-20 20:06:24,073 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 26 [2022-11-20 20:06:24,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:24,073 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2022-11-20 20:06:24,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-20 20:06:24,074 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2022-11-20 20:06:24,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-20 20:06:24,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:24,076 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:06:24,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:24,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:24,283 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:06:24,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:24,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1479325671, now seen corresponding path program 2 times [2022-11-20 20:06:24,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:06:24,283 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276526269] [2022-11-20 20:06:24,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:24,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:06:24,304 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:06:24,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1254332859] [2022-11-20 20:06:24,306 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:06:24,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:24,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:24,308 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:24,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-20 20:06:24,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-20 20:06:24,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:06:24,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-20 20:06:24,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:24,577 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-20 20:06:24,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:24,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:06:24,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276526269] [2022-11-20 20:06:24,725 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:06:24,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254332859] [2022-11-20 20:06:24,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254332859] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:06:24,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [435189379] [2022-11-20 20:06:24,730 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:06:24,732 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:06:24,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:06:24,734 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:06:24,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:06:25,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:06:25,347 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:06:25,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1199#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:06:25,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:06:25,912 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:06:25,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-20 20:06:25,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348563357] [2022-11-20 20:06:25,912 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:06:25,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-20 20:06:25,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:06:25,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-20 20:06:25,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=433, Unknown=0, NotChecked=0, Total=506 [2022-11-20 20:06:25,914 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 20:06:26,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:26,123 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2022-11-20 20:06:26,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-20 20:06:26,125 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2022-11-20 20:06:26,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:26,126 INFO L225 Difference]: With dead ends: 47 [2022-11-20 20:06:26,126 INFO L226 Difference]: Without dead ends: 41 [2022-11-20 20:06:26,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2022-11-20 20:06:26,127 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 7 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:26,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 74 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-20 20:06:26,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-20 20:06:26,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-20 20:06:26,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 20:06:26,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-11-20 20:06:26,139 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 34 [2022-11-20 20:06:26,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:26,140 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-11-20 20:06:26,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-20 20:06:26,140 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-11-20 20:06:26,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-20 20:06:26,141 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:26,141 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:06:26,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:26,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:26,347 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:06:26,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:26,348 INFO L85 PathProgramCache]: Analyzing trace with hash 179399873, now seen corresponding path program 3 times [2022-11-20 20:06:26,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:06:26,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990446008] [2022-11-20 20:06:26,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:26,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:06:26,371 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:06:26,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [846539872] [2022-11-20 20:06:26,373 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:06:26,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:26,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:26,375 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:26,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-20 20:06:26,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:06:26,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:06:26,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-20 20:06:26,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:26,716 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 38 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-20 20:06:26,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:30,943 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))))) is different from false [2022-11-20 20:06:32,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:06:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990446008] [2022-11-20 20:06:32,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:06:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846539872] [2022-11-20 20:06:32,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846539872] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:06:32,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [980544958] [2022-11-20 20:06:32,976 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:06:32,976 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:06:32,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:06:32,977 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:06:32,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:06:33,559 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:06:33,568 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:06:34,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1534#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:06:34,094 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:06:34,094 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:06:34,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-11-20 20:06:34,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118495266] [2022-11-20 20:06:34,094 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:06:34,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-20 20:06:34,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:06:34,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-20 20:06:34,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=515, Unknown=1, NotChecked=46, Total=650 [2022-11-20 20:06:34,096 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 20:06:34,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:34,373 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2022-11-20 20:06:34,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-20 20:06:34,374 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 42 [2022-11-20 20:06:34,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:34,375 INFO L225 Difference]: With dead ends: 49 [2022-11-20 20:06:34,375 INFO L226 Difference]: Without dead ends: 43 [2022-11-20 20:06:34,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=111, Invalid=648, Unknown=1, NotChecked=52, Total=812 [2022-11-20 20:06:34,376 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 6 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:34,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 111 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:06:34,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-20 20:06:34,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-11-20 20:06:34,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 20:06:34,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2022-11-20 20:06:34,388 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 42 [2022-11-20 20:06:34,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:34,388 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2022-11-20 20:06:34,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-20 20:06:34,389 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2022-11-20 20:06:34,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-20 20:06:34,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:34,390 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:06:34,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:34,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-20 20:06:34,596 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:06:34,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:34,596 INFO L85 PathProgramCache]: Analyzing trace with hash -783657828, now seen corresponding path program 1 times [2022-11-20 20:06:34,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:06:34,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256588413] [2022-11-20 20:06:34,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:34,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:06:34,606 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:06:34,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1752803463] [2022-11-20 20:06:34,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:34,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:34,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:34,608 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:34,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-20 20:06:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:06:34,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-20 20:06:34,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:34,756 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:06:34,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:34,855 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-20 20:06:34,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:06:34,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256588413] [2022-11-20 20:06:34,856 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:06:34,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752803463] [2022-11-20 20:06:34,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752803463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:06:34,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114293976] [2022-11-20 20:06:34,858 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:06:34,859 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:06:34,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:06:34,859 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:06:34,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:06:35,546 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-20 20:06:35,550 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:06:36,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1950#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:06:36,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:06:36,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:06:36,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-20 20:06:36,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593101888] [2022-11-20 20:06:36,126 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:06:36,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:06:36,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:06:36,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:06:36,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-11-20 20:06:36,127 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-20 20:06:36,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:06:36,437 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2022-11-20 20:06:36,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-20 20:06:36,438 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 44 [2022-11-20 20:06:36,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:06:36,443 INFO L225 Difference]: With dead ends: 129 [2022-11-20 20:06:36,444 INFO L226 Difference]: Without dead ends: 119 [2022-11-20 20:06:36,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=221, Invalid=835, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:06:36,447 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 121 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:06:36,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 152 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:06:36,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-20 20:06:36,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 94. [2022-11-20 20:06:36,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 66 states have (on average 1.106060606060606) internal successors, (73), 71 states have internal predecessors, (73), 17 states have call successors, (17), 11 states have call predecessors, (17), 10 states have return successors, (16), 11 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-20 20:06:36,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 106 transitions. [2022-11-20 20:06:36,494 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 106 transitions. Word has length 44 [2022-11-20 20:06:36,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:06:36,495 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 106 transitions. [2022-11-20 20:06:36,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 9 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2022-11-20 20:06:36,495 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 106 transitions. [2022-11-20 20:06:36,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-20 20:06:36,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:06:36,504 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:06:36,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-20 20:06:36,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:36,710 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:06:36,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:06:36,711 INFO L85 PathProgramCache]: Analyzing trace with hash 1502128027, now seen corresponding path program 4 times [2022-11-20 20:06:36,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:06:36,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838898355] [2022-11-20 20:06:36,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:06:36,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:06:36,725 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:06:36,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1091611543] [2022-11-20 20:06:36,730 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:06:36,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:06:36,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:06:36,731 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:06:36,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-20 20:06:36,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:06:36,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-20 20:06:36,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:06:37,033 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 26 proven. 41 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-20 20:06:37,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:06:41,094 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) .cse0) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))))) is different from false [2022-11-20 20:06:57,163 WARN L859 $PredicateComparison]: unable to prove that (or (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95|))) (or (= 0 (mod (+ .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 7) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 6)) 12)) (= .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81|))))) (not (= |c___VERIFIER_assert_#in~cond| 0))) is different from true [2022-11-20 20:07:15,221 WARN L859 $PredicateComparison]: unable to prove that (or (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95|))) (or (= 0 (mod (+ .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 7) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 10) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| 6)) 12)) (= .cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_95| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_81|))))) (not (= |c___VERIFIER_assert_#in~cond| 0)) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-20 20:07:37,442 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))))) is different from false [2022-11-20 20:07:39,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:07:39,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838898355] [2022-11-20 20:07:39,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:07:39,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091611543] [2022-11-20 20:07:39,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091611543] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:07:39,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418329630] [2022-11-20 20:07:39,473 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:07:39,473 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:07:39,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:07:39,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:07:39,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:07:40,214 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:07:40,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:07:40,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2516#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:07:40,975 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:07:40,975 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:07:40,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-11-20 20:07:40,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508292178] [2022-11-20 20:07:40,975 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:07:40,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-20 20:07:40,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:07:40,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-20 20:07:40,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=481, Unknown=6, NotChecked=188, Total=756 [2022-11-20 20:07:40,977 INFO L87 Difference]: Start difference. First operand 94 states and 106 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 20:07:41,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:07:41,274 INFO L93 Difference]: Finished difference Result 99 states and 110 transitions. [2022-11-20 20:07:41,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-20 20:07:41,275 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 50 [2022-11-20 20:07:41,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:07:41,276 INFO L225 Difference]: With dead ends: 99 [2022-11-20 20:07:41,276 INFO L226 Difference]: Without dead ends: 93 [2022-11-20 20:07:41,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=101, Invalid=611, Unknown=6, NotChecked=212, Total=930 [2022-11-20 20:07:41,277 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 6 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:07:41,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 144 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:07:41,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-20 20:07:41,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-11-20 20:07:41,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 70 states have internal predecessors, (72), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (15), 11 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-20 20:07:41,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 103 transitions. [2022-11-20 20:07:41,297 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 103 transitions. Word has length 50 [2022-11-20 20:07:41,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:07:41,298 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 103 transitions. [2022-11-20 20:07:41,298 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 6 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-20 20:07:41,298 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 103 transitions. [2022-11-20 20:07:41,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-20 20:07:41,299 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:07:41,300 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:07:41,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-11-20 20:07:41,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-20 20:07:41,505 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:07:41,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:07:41,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1530107787, now seen corresponding path program 5 times [2022-11-20 20:07:41,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:07:41,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473900197] [2022-11-20 20:07:41,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:41,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:07:41,520 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:07:41,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1126571520] [2022-11-20 20:07:41,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:07:41,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:07:41,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:07:41,524 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:07:41,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-20 20:07:41,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-20 20:07:41,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:07:41,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-20 20:07:41,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:42,016 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 22 proven. 70 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-20 20:07:42,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:42,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:07:42,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473900197] [2022-11-20 20:07:42,171 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:07:42,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126571520] [2022-11-20 20:07:42,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126571520] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:07:42,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1909078772] [2022-11-20 20:07:42,173 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:07:42,174 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:07:42,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:07:42,174 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:07:42,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:07:42,667 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:07:42,672 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:07:43,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3047#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:07:43,225 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:07:43,225 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:07:43,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-11-20 20:07:43,226 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697074964] [2022-11-20 20:07:43,226 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:07:43,226 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-20 20:07:43,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:07:43,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-20 20:07:43,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2022-11-20 20:07:43,227 INFO L87 Difference]: Start difference. First operand 93 states and 103 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:07:43,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:07:43,540 INFO L93 Difference]: Finished difference Result 98 states and 107 transitions. [2022-11-20 20:07:43,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-20 20:07:43,541 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 58 [2022-11-20 20:07:43,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:07:43,543 INFO L225 Difference]: With dead ends: 98 [2022-11-20 20:07:43,543 INFO L226 Difference]: Without dead ends: 92 [2022-11-20 20:07:43,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2022-11-20 20:07:43,544 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 6 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-20 20:07:43,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 181 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-20 20:07:43,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-20 20:07:43,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-11-20 20:07:43,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 69 states have internal predecessors, (71), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-20 20:07:43,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2022-11-20 20:07:43,564 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 58 [2022-11-20 20:07:43,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:07:43,565 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2022-11-20 20:07:43,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-20 20:07:43,565 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2022-11-20 20:07:43,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-20 20:07:43,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:07:43,566 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:07:43,574 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-20 20:07:43,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:07:43,771 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:07:43,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:07:43,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1835618481, now seen corresponding path program 6 times [2022-11-20 20:07:43,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:07:43,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067009564] [2022-11-20 20:07:43,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:43,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:07:43,780 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:07:43,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [716297658] [2022-11-20 20:07:43,780 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:07:43,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:07:43,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:07:43,782 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:07:43,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-20 20:07:43,955 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:07:43,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:07:43,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 40 conjunts are in the unsatisfiable core [2022-11-20 20:07:43,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:44,224 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 15 proven. 106 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2022-11-20 20:07:44,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:44,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:07:44,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067009564] [2022-11-20 20:07:44,482 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:07:44,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716297658] [2022-11-20 20:07:44,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [716297658] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:07:44,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426776430] [2022-11-20 20:07:44,484 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:07:44,484 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:07:44,484 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:07:44,484 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:07:44,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:07:45,031 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:07:45,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:07:45,621 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3599#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:07:45,621 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:07:45,621 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:07:45,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-11-20 20:07:45,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355683637] [2022-11-20 20:07:45,621 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:07:45,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-20 20:07:45,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:07:45,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-20 20:07:45,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2022-11-20 20:07:45,623 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-20 20:07:45,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:07:45,951 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2022-11-20 20:07:45,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-20 20:07:45,952 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 66 [2022-11-20 20:07:45,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:07:45,953 INFO L225 Difference]: With dead ends: 97 [2022-11-20 20:07:45,953 INFO L226 Difference]: Without dead ends: 91 [2022-11-20 20:07:45,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=765, Unknown=0, NotChecked=0, Total=870 [2022-11-20 20:07:45,954 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 7 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:07:45,955 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 206 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:07:45,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-20 20:07:45,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-20 20:07:45,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 68 states have internal predecessors, (70), 14 states have call successors, (14), 11 states have call predecessors, (14), 10 states have return successors, (13), 11 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-20 20:07:45,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2022-11-20 20:07:45,972 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 66 [2022-11-20 20:07:45,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:07:45,972 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2022-11-20 20:07:45,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 8 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-20 20:07:45,973 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2022-11-20 20:07:45,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-20 20:07:45,974 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:07:45,974 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:07:45,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-20 20:07:46,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-20 20:07:46,180 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:07:46,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:07:46,180 INFO L85 PathProgramCache]: Analyzing trace with hash 251755561, now seen corresponding path program 7 times [2022-11-20 20:07:46,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:07:46,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018808635] [2022-11-20 20:07:46,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:07:46,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:07:46,189 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:07:46,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [337983762] [2022-11-20 20:07:46,189 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:07:46,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:07:46,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:07:46,191 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:07:46,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-20 20:07:46,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:07:46,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-20 20:07:46,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:07:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 41 proven. 113 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2022-11-20 20:07:46,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:07:50,862 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (= (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) .cse0) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))))) is different from false [2022-11-20 20:08:10,933 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_135| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167|))) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| 10) (* 7 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| 6) .cse0) 12) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_135|) .cse0))))) is different from true [2022-11-20 20:08:29,101 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_135| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167|))) (or (= (mod (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| 10) (* 7 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| 6) .cse0) 12) 0) (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_167| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_135|) .cse0)))) (= c___VERIFIER_assert_~cond 0)) is different from true [2022-11-20 20:08:53,346 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 2) 1)))))) is different from false [2022-11-20 20:08:55,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:08:55,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018808635] [2022-11-20 20:08:55,373 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:08:55,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337983762] [2022-11-20 20:08:55,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337983762] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:08:55,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667603830] [2022-11-20 20:08:55,375 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:08:55,375 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:08:55,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:08:55,376 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:08:55,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:08:55,855 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:08:55,860 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:08:56,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4175#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:08:56,405 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:08:56,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:08:56,406 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-11-20 20:08:56,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871668370] [2022-11-20 20:08:56,406 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:08:56,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-20 20:08:56,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:08:56,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-20 20:08:56,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=623, Unknown=8, NotChecked=212, Total=930 [2022-11-20 20:08:56,407 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-20 20:08:56,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:08:56,837 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-11-20 20:08:56,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-20 20:08:56,838 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 74 [2022-11-20 20:08:56,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:08:56,839 INFO L225 Difference]: With dead ends: 96 [2022-11-20 20:08:56,839 INFO L226 Difference]: Without dead ends: 90 [2022-11-20 20:08:56,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=107, Invalid=771, Unknown=8, NotChecked=236, Total=1122 [2022-11-20 20:08:56,840 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 6 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:08:56,841 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 267 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:08:56,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-20 20:08:56,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-11-20 20:08:56,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 67 states have internal predecessors, (69), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 20:08:56,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2022-11-20 20:08:56,857 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 74 [2022-11-20 20:08:56,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:08:56,858 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2022-11-20 20:08:56,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 14 states have internal predecessors, (34), 9 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-20 20:08:56,858 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2022-11-20 20:08:56,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-20 20:08:56,859 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:08:56,860 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:08:56,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-20 20:08:57,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-20 20:08:57,060 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:08:57,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:08:57,061 INFO L85 PathProgramCache]: Analyzing trace with hash 1277611779, now seen corresponding path program 8 times [2022-11-20 20:08:57,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:08:57,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654800179] [2022-11-20 20:08:57,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:08:57,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:08:57,069 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:08:57,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [639839047] [2022-11-20 20:08:57,070 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:08:57,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:08:57,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:08:57,071 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:08:57,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-20 20:09:23,026 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-20 20:09:23,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:23,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-20 20:09:23,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:23,337 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 25 proven. 166 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-20 20:09:23,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:23,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654800179] [2022-11-20 20:09:23,498 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:09:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639839047] [2022-11-20 20:09:23,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639839047] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:09:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105891798] [2022-11-20 20:09:23,500 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:09:23,500 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:09:23,501 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:09:23,501 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:09:23,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:09:24,247 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:09:24,251 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:09:25,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4769#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:09:25,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:09:25,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:09:25,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-11-20 20:09:25,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168330238] [2022-11-20 20:09:25,100 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:09:25,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-20 20:09:25,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:25,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-20 20:09:25,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=721, Unknown=0, NotChecked=0, Total=812 [2022-11-20 20:09:25,102 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-20 20:09:25,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:25,567 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2022-11-20 20:09:25,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-20 20:09:25,567 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 82 [2022-11-20 20:09:25,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:25,568 INFO L225 Difference]: With dead ends: 95 [2022-11-20 20:09:25,569 INFO L226 Difference]: Without dead ends: 89 [2022-11-20 20:09:25,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:09:25,570 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 6 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:25,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 316 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:09:25,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-20 20:09:25,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-11-20 20:09:25,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-20 20:09:25,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-11-20 20:09:25,584 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 82 [2022-11-20 20:09:25,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:25,584 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-11-20 20:09:25,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.466666666666667) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-20 20:09:25,584 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-11-20 20:09:25,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-20 20:09:25,585 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:25,585 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:09:25,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-20 20:09:25,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:25,794 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:25,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:25,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1038047267, now seen corresponding path program 9 times [2022-11-20 20:09:25,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:25,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436339254] [2022-11-20 20:09:25,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:25,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:25,810 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:09:25,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [444108557] [2022-11-20 20:09:25,811 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:09:25,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:25,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:25,812 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:25,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-20 20:09:26,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:09:26,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:26,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-20 20:09:26,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 422 backedges. 21 proven. 211 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2022-11-20 20:09:26,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:32,092 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (= (+ (* 9 |ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 18) 81)) (<= |ULTIMATE.start_main_~k~0#1| (+ |c_ULTIMATE.start_main_~c~0#1| 8)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 9) |ULTIMATE.start_main_~k~0#1|))) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))))) is different from false [2022-11-20 20:09:32,095 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:32,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436339254] [2022-11-20 20:09:32,095 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:09:32,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444108557] [2022-11-20 20:09:32,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444108557] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:09:32,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353169411] [2022-11-20 20:09:32,097 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:09:32,097 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:09:32,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:09:32,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:09:32,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:09:32,593 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:09:32,598 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:09:33,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5585#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:09:33,293 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:09:33,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:09:33,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-20 20:09:33,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943523076] [2022-11-20 20:09:33,293 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:09:33,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-20 20:09:33,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:33,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-20 20:09:33,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1216, Unknown=1, NotChecked=72, Total=1482 [2022-11-20 20:09:33,295 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 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) [2022-11-20 20:09:33,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:33,819 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2022-11-20 20:09:33,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-20 20:09:33,820 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 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) Word has length 90 [2022-11-20 20:09:33,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:33,821 INFO L225 Difference]: With dead ends: 97 [2022-11-20 20:09:33,821 INFO L226 Difference]: Without dead ends: 91 [2022-11-20 20:09:33,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=213, Invalid=1430, Unknown=1, NotChecked=78, Total=1722 [2022-11-20 20:09:33,823 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 7 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 563 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:33,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 347 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 563 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-20 20:09:33,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-20 20:09:33,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-11-20 20:09:33,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 13 states have call successors, (13), 11 states have call predecessors, (13), 10 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 20:09:33,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2022-11-20 20:09:33,836 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 90 [2022-11-20 20:09:33,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:33,837 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2022-11-20 20:09:33,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.5) internal successors, (40), 16 states have internal predecessors, (40), 11 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) [2022-11-20 20:09:33,837 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2022-11-20 20:09:33,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-11-20 20:09:33,838 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:33,838 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:09:33,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-20 20:09:34,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-20 20:09:34,048 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:34,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:34,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1775712440, now seen corresponding path program 2 times [2022-11-20 20:09:34,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:34,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443951555] [2022-11-20 20:09:34,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:34,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:34,060 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:09:34,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1159888634] [2022-11-20 20:09:34,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:09:34,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:34,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:34,062 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:34,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-20 20:09:38,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-20 20:09:38,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:09:38,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-20 20:09:38,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:38,806 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 60 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-20 20:09:38,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:09:39,078 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-20 20:09:39,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:09:39,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443951555] [2022-11-20 20:09:39,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:09:39,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159888634] [2022-11-20 20:09:39,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159888634] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-20 20:09:39,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1675130243] [2022-11-20 20:09:39,081 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:09:39,081 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:09:39,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:09:39,081 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:09:39,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:09:39,662 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-20 20:09:39,666 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:09:40,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6433#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:09:40,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:09:40,271 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-20 20:09:40,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-20 20:09:40,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798278236] [2022-11-20 20:09:40,272 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-20 20:09:40,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-20 20:09:40,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:09:40,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-20 20:09:40,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=942, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 20:09:40,274 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (23), 12 states have call predecessors, (23), 12 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2022-11-20 20:09:40,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:09:40,959 INFO L93 Difference]: Finished difference Result 261 states and 285 transitions. [2022-11-20 20:09:40,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-20 20:09:40,960 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (23), 12 states have call predecessors, (23), 12 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) Word has length 92 [2022-11-20 20:09:40,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:09:40,962 INFO L225 Difference]: With dead ends: 261 [2022-11-20 20:09:40,962 INFO L226 Difference]: Without dead ends: 251 [2022-11-20 20:09:40,964 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 774 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=833, Invalid=2359, Unknown=0, NotChecked=0, Total=3192 [2022-11-20 20:09:40,965 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 235 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 235 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-20 20:09:40,965 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [235 Valid, 234 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-20 20:09:40,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2022-11-20 20:09:40,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 196. [2022-11-20 20:09:40,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 138 states have (on average 1.0942028985507246) internal successors, (151), 149 states have internal predecessors, (151), 35 states have call successors, (35), 23 states have call predecessors, (35), 22 states have return successors, (34), 23 states have call predecessors, (34), 34 states have call successors, (34) [2022-11-20 20:09:41,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 220 transitions. [2022-11-20 20:09:41,000 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 220 transitions. Word has length 92 [2022-11-20 20:09:41,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:09:41,001 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 220 transitions. [2022-11-20 20:09:41,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.0) internal successors, (104), 26 states have internal predecessors, (104), 21 states have call successors, (23), 12 states have call predecessors, (23), 12 states have return successors, (22), 21 states have call predecessors, (22), 21 states have call successors, (22) [2022-11-20 20:09:41,001 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 220 transitions. [2022-11-20 20:09:41,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-20 20:09:41,002 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:09:41,002 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:09:41,009 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-20 20:09:41,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-20 20:09:41,203 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:09:41,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:09:41,203 INFO L85 PathProgramCache]: Analyzing trace with hash 789120695, now seen corresponding path program 10 times [2022-11-20 20:09:41,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:09:41,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163429432] [2022-11-20 20:09:41,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:09:41,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:09:41,214 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:09:41,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1636800248] [2022-11-20 20:09:41,215 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:09:41,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:09:41,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:09:41,216 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:09:41,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-20 20:09:45,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-20 20:09:45,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-20 20:09:45,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:09:45,923 INFO L134 CoverageAnalysis]: Checked inductivity of 508 backedges. 29 proven. 248 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2022-11-20 20:09:45,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:10:21,431 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278|))) (or (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 16) 64 .cse0) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236|) (* 8 |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236|))) (= (mod (+ (* 7 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 6) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 10) .cse0) 12) 0))))) is different from true [2022-11-20 20:10:39,752 WARN L859 $PredicateComparison]: unable to prove that (or (not (= |c___VERIFIER_assert_#in~cond| 0)) (= c___VERIFIER_assert_~cond 0) (forall ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| Int)) (let ((.cse0 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278|))) (or (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 16) 64 .cse0) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236|) (* 8 |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_236|))) (= (mod (+ (* 7 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 6) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_278| 10) .cse0) 12) 0))))) is different from true [2022-11-20 20:10:47,810 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (not (< (+ |c_ULTIMATE.start_main_~c~0#1| 8) |c_ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 9) |c_ULTIMATE.start_main_~k~0#1|) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))) (= (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 18) 81) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* 9 |c_ULTIMATE.start_main_~k~0#1|))))) is different from false [2022-11-20 20:10:58,396 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|))) (or (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (= (+ .cse0 (* |c_ULTIMATE.start_main_~y~0#1| 20) 100) (+ (* |ULTIMATE.start_main_~k~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|))) (< (+ |c_ULTIMATE.start_main_~c~0#1| 10) |ULTIMATE.start_main_~k~0#1|) (<= |ULTIMATE.start_main_~k~0#1| (+ |c_ULTIMATE.start_main_~c~0#1| 9)))) (not (= 0 (mod (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 10) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 7) .cse0 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| 6)) 12))))) is different from false [2022-11-20 20:11:00,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:11:00,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163429432] [2022-11-20 20:11:00,424 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:11:00,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636800248] [2022-11-20 20:11:00,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636800248] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:11:00,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902318466] [2022-11-20 20:11:00,426 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:11:00,426 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:11:00,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:11:00,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:11:00,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:11:00,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:11:00,898 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:11:01,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7728#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:11:01,642 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:11:01,643 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:11:01,643 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-20 20:11:01,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916845554] [2022-11-20 20:11:01,643 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:11:01,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-20 20:11:01,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:11:01,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-20 20:11:01,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1281, Unknown=5, NotChecked=308, Total=1806 [2022-11-20 20:11:01,645 INFO L87 Difference]: Start difference. First operand 196 states and 220 transitions. Second operand has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 20:11:02,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:11:02,225 INFO L93 Difference]: Finished difference Result 201 states and 224 transitions. [2022-11-20 20:11:02,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-20 20:11:02,225 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 98 [2022-11-20 20:11:02,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:11:02,227 INFO L225 Difference]: With dead ends: 201 [2022-11-20 20:11:02,227 INFO L226 Difference]: Without dead ends: 195 [2022-11-20 20:11:02,228 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=232, Invalid=1501, Unknown=5, NotChecked=332, Total=2070 [2022-11-20 20:11:02,228 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 690 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 426 SdHoareTripleChecker+Invalid, 692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 690 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:11:02,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 426 Invalid, 692 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 690 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:11:02,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-11-20 20:11:02,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-11-20 20:11:02,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 138 states have (on average 1.0869565217391304) internal successors, (150), 148 states have internal predecessors, (150), 34 states have call successors, (34), 23 states have call predecessors, (34), 22 states have return successors, (33), 23 states have call predecessors, (33), 33 states have call successors, (33) [2022-11-20 20:11:02,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 217 transitions. [2022-11-20 20:11:02,265 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 217 transitions. Word has length 98 [2022-11-20 20:11:02,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:11:02,265 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 217 transitions. [2022-11-20 20:11:02,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 17 states have internal predecessors, (43), 12 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-20 20:11:02,265 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 217 transitions. [2022-11-20 20:11:02,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-20 20:11:02,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:11:02,267 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:11:02,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-11-20 20:11:02,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-20 20:11:02,474 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:11:02,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:11:02,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1762006127, now seen corresponding path program 11 times [2022-11-20 20:11:02,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:11:02,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140174060] [2022-11-20 20:11:02,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:11:02,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:11:02,482 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:11:02,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1137617985] [2022-11-20 20:11:02,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-20 20:11:02,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:11:02,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:11:02,484 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:11:02,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-20 20:12:46,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-20 20:12:46,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:46,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-20 20:12:46,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:46,755 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 43 proven. 283 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-20 20:12:46,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:46,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:12:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140174060] [2022-11-20 20:12:46,926 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:12:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137617985] [2022-11-20 20:12:46,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137617985] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:12:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110286768] [2022-11-20 20:12:46,928 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:12:46,928 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:12:46,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:12:46,929 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:12:46,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:12:47,381 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:12:47,387 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:12:48,031 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8697#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:12:48,031 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:12:48,031 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:12:48,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-11-20 20:12:48,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836729214] [2022-11-20 20:12:48,031 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:12:48,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-20 20:12:48,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:12:48,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-20 20:12:48,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2022-11-20 20:12:48,033 INFO L87 Difference]: Start difference. First operand 195 states and 217 transitions. Second operand has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-20 20:12:48,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:12:48,643 INFO L93 Difference]: Finished difference Result 200 states and 221 transitions. [2022-11-20 20:12:48,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-20 20:12:48,644 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 106 [2022-11-20 20:12:48,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:12:48,645 INFO L225 Difference]: With dead ends: 200 [2022-11-20 20:12:48,646 INFO L226 Difference]: Without dead ends: 194 [2022-11-20 20:12:48,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=120, Invalid=1070, Unknown=0, NotChecked=0, Total=1190 [2022-11-20 20:12:48,647 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 7 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 741 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-20 20:12:48,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 461 Invalid, 741 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 739 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-20 20:12:48,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-11-20 20:12:48,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2022-11-20 20:12:48,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 138 states have (on average 1.0797101449275361) internal successors, (149), 147 states have internal predecessors, (149), 33 states have call successors, (33), 23 states have call predecessors, (33), 22 states have return successors, (32), 23 states have call predecessors, (32), 32 states have call successors, (32) [2022-11-20 20:12:48,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 214 transitions. [2022-11-20 20:12:48,677 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 214 transitions. Word has length 106 [2022-11-20 20:12:48,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:12:48,678 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 214 transitions. [2022-11-20 20:12:48,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 18 states have internal predecessors, (46), 13 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-20 20:12:48,678 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 214 transitions. [2022-11-20 20:12:48,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-20 20:12:48,679 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:12:48,679 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:12:48,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-20 20:12:48,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-20 20:12:48,880 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:12:48,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:12:48,880 INFO L85 PathProgramCache]: Analyzing trace with hash 1141724779, now seen corresponding path program 12 times [2022-11-20 20:12:48,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:12:48,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723192511] [2022-11-20 20:12:48,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:12:48,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:12:48,891 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:12:48,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [224943683] [2022-11-20 20:12:48,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-20 20:12:48,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:12:48,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:12:48,892 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:12:48,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-20 20:12:50,315 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-20 20:12:50,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-20 20:12:50,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-20 20:12:50,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-20 20:12:50,756 INFO L134 CoverageAnalysis]: Checked inductivity of 704 backedges. 27 proven. 352 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-20 20:12:50,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-20 20:12:50,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-20 20:12:50,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723192511] [2022-11-20 20:12:50,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-20 20:12:50,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224943683] [2022-11-20 20:12:50,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224943683] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-20 20:12:50,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126017878] [2022-11-20 20:12:50,935 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-20 20:12:50,935 INFO L166 IcfgInterpreter]: Building call graph [2022-11-20 20:12:50,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-20 20:12:50,936 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-20 20:12:50,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-20 20:12:51,366 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-20 20:12:51,370 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-20 20:12:52,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9687#(and (<= ~counter~0 51) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-20 20:12:52,037 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-20 20:12:52,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-20 20:12:52,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-20 20:12:52,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316804037] [2022-11-20 20:12:52,038 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-20 20:12:52,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-20 20:12:52,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-20 20:12:52,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-20 20:12:52,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=953, Unknown=0, NotChecked=0, Total=1056 [2022-11-20 20:12:52,039 INFO L87 Difference]: Start difference. First operand 194 states and 214 transitions. Second operand has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-20 20:12:52,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-20 20:12:52,791 INFO L93 Difference]: Finished difference Result 199 states and 218 transitions. [2022-11-20 20:12:52,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-20 20:12:52,794 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 114 [2022-11-20 20:12:52,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-20 20:12:52,795 INFO L225 Difference]: With dead ends: 199 [2022-11-20 20:12:52,796 INFO L226 Difference]: Without dead ends: 193 [2022-11-20 20:12:52,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=123, Invalid=1137, Unknown=0, NotChecked=0, Total=1260 [2022-11-20 20:12:52,797 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 6 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 884 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 886 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-20 20:12:52,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 552 Invalid, 886 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 884 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-20 20:12:52,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2022-11-20 20:12:52,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2022-11-20 20:12:52,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 138 states have (on average 1.0724637681159421) internal successors, (148), 146 states have internal predecessors, (148), 32 states have call successors, (32), 23 states have call predecessors, (32), 22 states have return successors, (31), 23 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-20 20:12:52,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 211 transitions. [2022-11-20 20:12:52,829 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 211 transitions. Word has length 114 [2022-11-20 20:12:52,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-20 20:12:52,830 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 211 transitions. [2022-11-20 20:12:52,830 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 19 states have internal predecessors, (49), 14 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-20 20:12:52,830 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 211 transitions. [2022-11-20 20:12:52,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-20 20:12:52,831 INFO L187 NwaCegarLoop]: Found error trace [2022-11-20 20:12:52,831 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-20 20:12:52,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-20 20:12:53,039 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:12:53,039 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-20 20:12:53,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-20 20:12:53,040 INFO L85 PathProgramCache]: Analyzing trace with hash -966965435, now seen corresponding path program 13 times [2022-11-20 20:12:53,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-20 20:12:53,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39838299] [2022-11-20 20:12:53,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-20 20:12:53,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-20 20:12:53,059 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-20 20:12:53,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [971186173] [2022-11-20 20:12:53,060 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-20 20:12:53,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-20 20:12:53,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 [2022-11-20 20:12:53,061 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-20 20:12:53,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_354230d6-b30d-40c1-9211-55e9d9f7a1ce/bin/utaipan-6cKwYrpEi9/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process