./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI --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 ac7d6bbeae1af74610eb5ea0ec9cc56676532539c7535ebfdf72e0c17174815d --- 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-5e519f3 [2022-11-03 02:25:18,792 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:25:18,795 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:25:18,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:25:18,836 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:25:18,837 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:25:18,838 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:25:18,840 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:25:18,842 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:25:18,842 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:25:18,843 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:25:18,844 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:25:18,845 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:25:18,846 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:25:18,847 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:25:18,848 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:25:18,849 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:25:18,850 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:25:18,851 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:25:18,853 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:25:18,855 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:25:18,856 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:25:18,857 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:25:18,858 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:25:18,862 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:25:18,862 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:25:18,862 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:25:18,863 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:25:18,864 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:25:18,865 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:25:18,865 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:25:18,866 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:25:18,867 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:25:18,868 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:25:18,869 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:25:18,870 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:25:18,870 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:25:18,871 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:25:18,871 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:25:18,872 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:25:18,873 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:25:18,885 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:25:18,906 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:25:18,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:25:18,907 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:25:18,907 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:25:18,907 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:25:18,908 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:25:18,908 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:25:18,908 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:25:18,908 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:25:18,908 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:25:18,908 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:25:18,909 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:25:18,909 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:25:18,909 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:25:18,909 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:25:18,909 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:25:18,910 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:25:18,910 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:25:18,910 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:25:18,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:25:18,912 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:25:18,912 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:25:18,912 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:25:18,912 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:25:18,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:25:18,913 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:25:18,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:25:18,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:25:18,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:25:18,913 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:25:18,914 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:25:18,914 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:25:18,914 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:25:18,914 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:25:18,914 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:25:18,915 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:25:18,915 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_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac7d6bbeae1af74610eb5ea0ec9cc56676532539c7535ebfdf72e0c17174815d [2022-11-03 02:25:19,154 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:25:19,180 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:25:19,183 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:25:19,195 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:25:19,196 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:25:19,197 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c [2022-11-03 02:25:19,278 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/data/08e385fb0/2c237557f1f347fc9d95d80931314640/FLAG467bbb108 [2022-11-03 02:25:19,856 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:25:19,861 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c [2022-11-03 02:25:19,873 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/data/08e385fb0/2c237557f1f347fc9d95d80931314640/FLAG467bbb108 [2022-11-03 02:25:20,209 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/data/08e385fb0/2c237557f1f347fc9d95d80931314640 [2022-11-03 02:25:20,215 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:25:20,216 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:25:20,226 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:25:20,226 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:25:20,230 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:25:20,230 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,232 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c45ee0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20, skipping insertion in model container [2022-11-03 02:25:20,232 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,239 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:25:20,253 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:25:20,463 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c[535,548] [2022-11-03 02:25:20,484 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:25:20,493 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:25:20,507 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/sv-benchmarks/c/nla-digbench-scaling/fermat1-ll_unwindbound100.c[535,548] [2022-11-03 02:25:20,517 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:25:20,531 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:25:20,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20 WrapperNode [2022-11-03 02:25:20,532 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:25:20,533 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:25:20,533 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:25:20,533 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:25:20,541 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,548 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,568 INFO L138 Inliner]: procedures = 14, calls = 13, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 67 [2022-11-03 02:25:20,568 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:25:20,569 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:25:20,569 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:25:20,569 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:25:20,579 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,579 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,581 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,581 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,585 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,589 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,598 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,599 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,601 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:25:20,602 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:25:20,602 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:25:20,602 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:25:20,611 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (1/1) ... [2022-11-03 02:25:20,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:25:20,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:20,667 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:25:20,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:25:20,723 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:25:20,723 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-03 02:25:20,723 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-03 02:25:20,724 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:25:20,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:25:20,724 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:25:20,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 02:25:20,724 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 02:25:20,810 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:25:20,812 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:25:21,026 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:25:21,047 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:25:21,047 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-03 02:25:21,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:25:21 BoogieIcfgContainer [2022-11-03 02:25:21,050 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:25:21,052 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:25:21,052 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:25:21,066 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:25:21,066 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:25:20" (1/3) ... [2022-11-03 02:25:21,067 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34b645bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:25:21, skipping insertion in model container [2022-11-03 02:25:21,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:25:20" (2/3) ... [2022-11-03 02:25:21,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34b645bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:25:21, skipping insertion in model container [2022-11-03 02:25:21,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:25:21" (3/3) ... [2022-11-03 02:25:21,071 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat1-ll_unwindbound100.c [2022-11-03 02:25:21,099 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:25:21,099 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:25:21,180 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:25:21,191 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;@4754f053, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:25:21,191 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:25:21,196 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-03 02:25:21,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-03 02:25:21,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:21,205 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:21,206 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:21,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:21,211 INFO L85 PathProgramCache]: Analyzing trace with hash -438729207, now seen corresponding path program 1 times [2022-11-03 02:25:21,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:21,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055295262] [2022-11-03 02:25:21,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:21,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:21,346 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:21,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1491531530] [2022-11-03 02:25:21,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:21,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:21,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:21,353 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:21,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:25:21,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:21,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 02:25:21,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:21,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:21,509 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:25:21,509 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:21,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055295262] [2022-11-03 02:25:21,510 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:21,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491531530] [2022-11-03 02:25:21,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491531530] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:21,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:21,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 02:25:21,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525084051] [2022-11-03 02:25:21,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:21,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 02:25:21,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:21,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 02:25:21,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:25:21,589 INFO L87 Difference]: Start difference. First operand has 27 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:21,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:21,649 INFO L93 Difference]: Finished difference Result 48 states and 77 transitions. [2022-11-03 02:25:21,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 02:25:21,652 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2022-11-03 02:25:21,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:21,666 INFO L225 Difference]: With dead ends: 48 [2022-11-03 02:25:21,666 INFO L226 Difference]: Without dead ends: 25 [2022-11-03 02:25:21,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 02:25:21,675 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:21,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 33 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:21,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-03 02:25:21,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-03 02:25:21,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 6 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) [2022-11-03 02:25:21,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 34 transitions. [2022-11-03 02:25:21,719 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 34 transitions. Word has length 13 [2022-11-03 02:25:21,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:21,721 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 34 transitions. [2022-11-03 02:25:21,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:21,722 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 34 transitions. [2022-11-03 02:25:21,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:25:21,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:21,724 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:21,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:21,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-03 02:25:21,950 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:21,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:21,951 INFO L85 PathProgramCache]: Analyzing trace with hash 2071776720, now seen corresponding path program 1 times [2022-11-03 02:25:21,951 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:21,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787350597] [2022-11-03 02:25:21,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:21,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:21,981 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:21,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1745254687] [2022-11-03 02:25:21,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:21,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:21,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:21,985 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:22,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:25:22,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:22,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:25:22,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:22,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:22,172 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:25:22,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:22,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787350597] [2022-11-03 02:25:22,173 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:22,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745254687] [2022-11-03 02:25:22,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745254687] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:22,176 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:22,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:25:22,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428900488] [2022-11-03 02:25:22,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:22,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:25:22,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:22,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:25:22,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:22,182 INFO L87 Difference]: Start difference. First operand 25 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:22,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:22,224 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-11-03 02:25:22,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:25:22,225 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-03 02:25:22,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:22,226 INFO L225 Difference]: With dead ends: 34 [2022-11-03 02:25:22,227 INFO L226 Difference]: Without dead ends: 27 [2022-11-03 02:25:22,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:25:22,230 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 0 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:22,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 82 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:25:22,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-03 02:25:22,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-11-03 02:25:22,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 6 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) [2022-11-03 02:25:22,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2022-11-03 02:25:22,251 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 14 [2022-11-03 02:25:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:22,251 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2022-11-03 02:25:22,252 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:22,252 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2022-11-03 02:25:22,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-03 02:25:22,253 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:22,253 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:22,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:22,468 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:22,468 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:22,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:22,469 INFO L85 PathProgramCache]: Analyzing trace with hash 2073445016, now seen corresponding path program 1 times [2022-11-03 02:25:22,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:22,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [123770167] [2022-11-03 02:25:22,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:22,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:22,480 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:22,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1580464390] [2022-11-03 02:25:22,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:22,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:22,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:22,485 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:22,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:25:22,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:22,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:25:22,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:22,782 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:22,783 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:25:22,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:22,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [123770167] [2022-11-03 02:25:22,783 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:22,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1580464390] [2022-11-03 02:25:22,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1580464390] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:22,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:25:22,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:25:22,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74955996] [2022-11-03 02:25:22,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:22,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:25:22,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:22,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:25:22,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:25:22,786 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:25,382 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.48s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:25:28,560 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.18s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:25:29,690 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:25:31,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:31,706 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2022-11-03 02:25:31,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:25:31,707 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2022-11-03 02:25:31,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:31,708 INFO L225 Difference]: With dead ends: 46 [2022-11-03 02:25:31,708 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 02:25:31,709 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 02:25:31,710 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 16 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.9s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:31,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 85 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 2 Unknown, 0 Unchecked, 8.9s Time] [2022-11-03 02:25:31,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 02:25:31,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-03 02:25:31,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 31 states have internal predecessors, (43), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 02:25:31,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 60 transitions. [2022-11-03 02:25:31,728 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 60 transitions. Word has length 14 [2022-11-03 02:25:31,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:31,729 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 60 transitions. [2022-11-03 02:25:31,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-03 02:25:31,730 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 60 transitions. [2022-11-03 02:25:31,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-03 02:25:31,732 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:31,732 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:31,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:31,938 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:31,939 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:31,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:31,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1668710205, now seen corresponding path program 1 times [2022-11-03 02:25:31,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:31,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562453016] [2022-11-03 02:25:31,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:31,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:31,954 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:31,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [763204652] [2022-11-03 02:25:31,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:31,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:31,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:31,957 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:31,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:25:32,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:32,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:25:32,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:32,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:32,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:32,395 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:32,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:32,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562453016] [2022-11-03 02:25:32,396 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:32,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763204652] [2022-11-03 02:25:32,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [763204652] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:32,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [912871316] [2022-11-03 02:25:32,416 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-03 02:25:32,416 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:32,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:32,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:32,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:32,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2022-11-03 02:25:33,004 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:25:33,099 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:38,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [912871316] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:38,651 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:25:38,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 8] total 21 [2022-11-03 02:25:38,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641101135] [2022-11-03 02:25:38,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:38,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:25:38,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:38,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:25:38,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:25:38,653 INFO L87 Difference]: Start difference. First operand 43 states and 60 transitions. Second operand has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:25:38,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:38,992 INFO L93 Difference]: Finished difference Result 57 states and 74 transitions. [2022-11-03 02:25:38,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:25:38,993 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-03 02:25:38,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:38,994 INFO L225 Difference]: With dead ends: 57 [2022-11-03 02:25:38,995 INFO L226 Difference]: Without dead ends: 50 [2022-11-03 02:25:38,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2022-11-03 02:25:38,996 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 8 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:38,996 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 132 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 107 Invalid, 0 Unknown, 33 Unchecked, 0.3s Time] [2022-11-03 02:25:38,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-03 02:25:39,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-11-03 02:25:39,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 35 states have internal predecessors, (47), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:25:39,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2022-11-03 02:25:39,033 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 20 [2022-11-03 02:25:39,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:39,033 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2022-11-03 02:25:39,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:25:39,034 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2022-11-03 02:25:39,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 02:25:39,035 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:39,035 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:39,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:39,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:39,250 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:39,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:39,250 INFO L85 PathProgramCache]: Analyzing trace with hash 1338452232, now seen corresponding path program 1 times [2022-11-03 02:25:39,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:39,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179118380] [2022-11-03 02:25:39,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:39,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:39,262 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:39,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1394869639] [2022-11-03 02:25:39,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:39,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:39,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:39,264 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:39,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:25:39,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:39,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:25:39,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:39,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:39,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:39,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:25:39,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:39,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179118380] [2022-11-03 02:25:39,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:39,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394869639] [2022-11-03 02:25:39,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394869639] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:39,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1869103955] [2022-11-03 02:25:39,583 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:25:39,584 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:39,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:39,584 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:39,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:40,053 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 58 for LOIs [2022-11-03 02:25:40,108 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:25:40,152 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:25:48,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1869103955] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:25:48,650 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:25:48,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7, 6] total 22 [2022-11-03 02:25:48,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344579462] [2022-11-03 02:25:48,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:25:48,651 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 02:25:48,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:25:48,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 02:25:48,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:25:48,652 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:25:49,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:25:49,263 INFO L93 Difference]: Finished difference Result 93 states and 129 transitions. [2022-11-03 02:25:49,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 02:25:49,263 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-03 02:25:49,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:25:49,265 INFO L225 Difference]: With dead ends: 93 [2022-11-03 02:25:49,265 INFO L226 Difference]: Without dead ends: 58 [2022-11-03 02:25:49,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=72, Invalid=390, Unknown=0, NotChecked=0, Total=462 [2022-11-03 02:25:49,267 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 7 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 24 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:25:49,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 157 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 185 Invalid, 0 Unknown, 24 Unchecked, 0.6s Time] [2022-11-03 02:25:49,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-03 02:25:49,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2022-11-03 02:25:49,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 41 states have internal predecessors, (52), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 02:25:49,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 73 transitions. [2022-11-03 02:25:49,290 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 73 transitions. Word has length 22 [2022-11-03 02:25:49,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:25:49,290 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 73 transitions. [2022-11-03 02:25:49,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 10 states have internal predecessors, (13), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:25:49,291 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 73 transitions. [2022-11-03 02:25:49,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-03 02:25:49,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:25:49,292 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:25:49,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:25:49,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:49,506 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:25:49,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:25:49,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1808313670, now seen corresponding path program 1 times [2022-11-03 02:25:49,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:25:49,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932255593] [2022-11-03 02:25:49,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:25:49,516 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:25:49,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [765161727] [2022-11-03 02:25:49,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:25:49,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:25:49,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:25:49,519 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:25:49,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:25:49,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:25:49,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-03 02:25:49,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:25:49,752 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:25:49,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:25:49,882 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 02:25:49,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:25:49,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932255593] [2022-11-03 02:25:49,883 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:25:49,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765161727] [2022-11-03 02:25:49,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765161727] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:25:49,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458831142] [2022-11-03 02:25:49,886 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-03 02:25:49,886 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:25:49,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:25:49,887 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:25:49,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:25:51,107 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 89 for LOIs [2022-11-03 02:25:51,263 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:25:51,301 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:01,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1309#(and (<= 2 ~counter~0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:26:01,372 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:01,372 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:26:01,372 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2022-11-03 02:26:01,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780003391] [2022-11-03 02:26:01,373 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:01,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:26:01,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:01,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:26:01,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2022-11-03 02:26:01,374 INFO L87 Difference]: Start difference. First operand 56 states and 73 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:26:02,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:02,022 INFO L93 Difference]: Finished difference Result 76 states and 101 transitions. [2022-11-03 02:26:02,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:26:02,023 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2022-11-03 02:26:02,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:02,025 INFO L225 Difference]: With dead ends: 76 [2022-11-03 02:26:02,025 INFO L226 Difference]: Without dead ends: 72 [2022-11-03 02:26:02,026 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:26:02,027 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 51 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:02,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 152 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:26:02,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-03 02:26:02,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 58. [2022-11-03 02:26:02,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 02:26:02,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2022-11-03 02:26:02,050 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 30 [2022-11-03 02:26:02,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:02,051 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2022-11-03 02:26:02,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:26:02,051 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2022-11-03 02:26:02,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-03 02:26:02,052 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:02,052 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:02,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:02,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-03 02:26:02,258 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:02,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:02,258 INFO L85 PathProgramCache]: Analyzing trace with hash -2135719167, now seen corresponding path program 1 times [2022-11-03 02:26:02,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:02,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117576826] [2022-11-03 02:26:02,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:02,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:02,267 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:26:02,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [671565013] [2022-11-03 02:26:02,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:02,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:02,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:02,268 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:02,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:26:02,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:02,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:26:02,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:02,388 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:26:02,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:02,478 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:26:02,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:02,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117576826] [2022-11-03 02:26:02,479 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:26:02,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671565013] [2022-11-03 02:26:02,479 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671565013] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 02:26:02,479 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 02:26:02,479 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 10 [2022-11-03 02:26:02,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158640893] [2022-11-03 02:26:02,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:26:02,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 02:26:02,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:02,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 02:26:02,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:26:02,481 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:26:02,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:02,541 INFO L93 Difference]: Finished difference Result 99 states and 132 transitions. [2022-11-03 02:26:02,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:26:02,542 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2022-11-03 02:26:02,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:02,543 INFO L225 Difference]: With dead ends: 99 [2022-11-03 02:26:02,543 INFO L226 Difference]: Without dead ends: 62 [2022-11-03 02:26:02,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-03 02:26:02,544 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 21 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:02,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 93 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:26:02,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-03 02:26:02,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-11-03 02:26:02,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 44 states have internal predecessors, (57), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 02:26:02,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2022-11-03 02:26:02,567 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 32 [2022-11-03 02:26:02,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:02,568 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2022-11-03 02:26:02,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2022-11-03 02:26:02,568 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2022-11-03 02:26:02,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-03 02:26:02,569 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:02,569 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:02,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:02,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-03 02:26:02,794 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:02,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:02,794 INFO L85 PathProgramCache]: Analyzing trace with hash -301470394, now seen corresponding path program 1 times [2022-11-03 02:26:02,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:02,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989384176] [2022-11-03 02:26:02,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:02,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:02,803 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:26:02,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [54371388] [2022-11-03 02:26:02,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:02,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:02,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:02,810 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:02,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 02:26:02,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:02,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 02:26:02,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:02,931 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:26:02,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:03,004 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:26:03,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:03,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989384176] [2022-11-03 02:26:03,005 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:26:03,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54371388] [2022-11-03 02:26:03,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54371388] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:03,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705407047] [2022-11-03 02:26:03,008 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-03 02:26:03,008 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:03,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:03,009 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:03,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:05,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:26:05,168 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:26:05,204 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:19,451 WARN L234 SmtUtils]: Spent 6.19s on a formula simplification. DAG size of input: 129 DAG size of output: 103 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:26:21,167 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2154#(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 [2022-11-03 02:26:21,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:21,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:26:21,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 10 [2022-11-03 02:26:21,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343412186] [2022-11-03 02:26:21,168 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:21,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 02:26:21,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:21,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 02:26:21,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:26:21,169 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-03 02:26:21,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:21,404 INFO L93 Difference]: Finished difference Result 186 states and 247 transitions. [2022-11-03 02:26:21,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 02:26:21,404 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 34 [2022-11-03 02:26:21,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:21,406 INFO L225 Difference]: With dead ends: 186 [2022-11-03 02:26:21,406 INFO L226 Difference]: Without dead ends: 149 [2022-11-03 02:26:21,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=173, Invalid=883, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:26:21,408 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 80 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:21,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 214 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:26:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-11-03 02:26:21,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 133. [2022-11-03 02:26:21,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.3061224489795917) internal successors, (128), 100 states have internal predecessors, (128), 23 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2022-11-03 02:26:21,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 173 transitions. [2022-11-03 02:26:21,451 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 173 transitions. Word has length 34 [2022-11-03 02:26:21,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:21,451 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 173 transitions. [2022-11-03 02:26:21,452 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 10 states have internal predecessors, (38), 7 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-03 02:26:21,452 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 173 transitions. [2022-11-03 02:26:21,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-03 02:26:21,453 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:21,453 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:21,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:21,666 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:21,666 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:21,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:21,667 INFO L85 PathProgramCache]: Analyzing trace with hash 753982024, now seen corresponding path program 1 times [2022-11-03 02:26:21,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:21,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149082037] [2022-11-03 02:26:21,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:21,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:21,716 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:26:21,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1197253238] [2022-11-03 02:26:21,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:21,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:21,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:21,720 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:21,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 02:26:21,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:21,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:26:21,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:21,840 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:26:21,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:26:21,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:21,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149082037] [2022-11-03 02:26:21,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:26:21,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197253238] [2022-11-03 02:26:21,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197253238] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:26:21,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:26:21,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:26:21,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890270199] [2022-11-03 02:26:21,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:26:21,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:26:21,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:21,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:26:21,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:26:21,843 INFO L87 Difference]: Start difference. First operand 133 states and 173 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 02:26:21,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:21,927 INFO L93 Difference]: Finished difference Result 228 states and 314 transitions. [2022-11-03 02:26:21,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:26:21,928 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-11-03 02:26:21,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:21,929 INFO L225 Difference]: With dead ends: 228 [2022-11-03 02:26:21,929 INFO L226 Difference]: Without dead ends: 173 [2022-11-03 02:26:21,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:26:21,931 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 19 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:21,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 97 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:26:21,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-11-03 02:26:21,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2022-11-03 02:26:21,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 127 states have (on average 1.31496062992126) internal successors, (167), 129 states have internal predecessors, (167), 32 states have call successors, (32), 12 states have call predecessors, (32), 11 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2022-11-03 02:26:21,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 230 transitions. [2022-11-03 02:26:21,984 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 230 transitions. Word has length 38 [2022-11-03 02:26:21,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:21,984 INFO L495 AbstractCegarLoop]: Abstraction has 171 states and 230 transitions. [2022-11-03 02:26:21,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-11-03 02:26:21,985 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 230 transitions. [2022-11-03 02:26:21,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-03 02:26:21,986 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:21,986 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:22,013 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:22,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:22,198 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:22,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:22,198 INFO L85 PathProgramCache]: Analyzing trace with hash 419809677, now seen corresponding path program 1 times [2022-11-03 02:26:22,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:22,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388383206] [2022-11-03 02:26:22,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:22,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:22,219 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:26:22,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590525302] [2022-11-03 02:26:22,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:22,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:22,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:22,221 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:22,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 02:26:22,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:22,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 02:26:22,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:22,351 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:26:22,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:22,431 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 02:26:22,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:22,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388383206] [2022-11-03 02:26:22,431 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:26:22,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590525302] [2022-11-03 02:26:22,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590525302] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:22,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1874247250] [2022-11-03 02:26:22,434 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:26:22,434 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:22,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:22,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:22,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:24,813 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 55 for LOIs [2022-11-03 02:26:24,846 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:26:24,879 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:26:44,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3575#(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 [2022-11-03 02:26:44,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:26:44,791 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:26:44,791 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2022-11-03 02:26:44,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862539065] [2022-11-03 02:26:44,791 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:26:44,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:26:44,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:26:44,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:26:44,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=803, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:26:44,794 INFO L87 Difference]: Start difference. First operand 171 states and 230 transitions. Second operand has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-03 02:26:45,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:26:45,192 INFO L93 Difference]: Finished difference Result 380 states and 527 transitions. [2022-11-03 02:26:45,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:26:45,193 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 40 [2022-11-03 02:26:45,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:26:45,195 INFO L225 Difference]: With dead ends: 380 [2022-11-03 02:26:45,195 INFO L226 Difference]: Without dead ends: 279 [2022-11-03 02:26:45,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 87 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 02:26:45,197 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 134 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:26:45,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 243 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:26:45,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-11-03 02:26:45,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 257. [2022-11-03 02:26:45,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 193 states have (on average 1.2953367875647668) internal successors, (250), 195 states have internal predecessors, (250), 48 states have call successors, (48), 16 states have call predecessors, (48), 15 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2022-11-03 02:26:45,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2022-11-03 02:26:45,272 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 40 [2022-11-03 02:26:45,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:26:45,273 INFO L495 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2022-11-03 02:26:45,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.75) internal successors, (45), 12 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-03 02:26:45,273 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2022-11-03 02:26:45,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-03 02:26:45,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:26:45,275 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:26:45,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 02:26:45,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 02:26:45,502 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:26:45,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:26:45,502 INFO L85 PathProgramCache]: Analyzing trace with hash -1579218988, now seen corresponding path program 1 times [2022-11-03 02:26:45,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:26:45,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343585360] [2022-11-03 02:26:45,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:45,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:26:45,511 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:26:45,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1635318081] [2022-11-03 02:26:45,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:26:45,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:26:45,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:26:45,513 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:26:45,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 02:26:45,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:26:45,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 02:26:45,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:26:45,710 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:26:45,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:26:45,852 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-11-03 02:26:45,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:26:45,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343585360] [2022-11-03 02:26:45,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:26:45,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635318081] [2022-11-03 02:26:45,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635318081] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:26:45,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749049731] [2022-11-03 02:26:45,858 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:26:45,861 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:26:45,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:26:45,863 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:26:45,863 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:26:51,329 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:26:51,334 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:26:51,378 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:11,827 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4813#(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 [2022-11-03 02:27:11,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:11,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:27:11,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-03 02:27:11,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064930558] [2022-11-03 02:27:11,828 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:11,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:27:11,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:11,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:27:11,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=924, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 02:27:11,830 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-03 02:27:12,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:12,328 INFO L93 Difference]: Finished difference Result 410 states and 556 transitions. [2022-11-03 02:27:12,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 02:27:12,329 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 46 [2022-11-03 02:27:12,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:12,332 INFO L225 Difference]: With dead ends: 410 [2022-11-03 02:27:12,332 INFO L226 Difference]: Without dead ends: 405 [2022-11-03 02:27:12,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=257, Invalid=1303, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:27:12,334 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 165 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:12,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 290 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:27:12,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2022-11-03 02:27:12,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 362. [2022-11-03 02:27:12,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 270 states have (on average 1.288888888888889) internal successors, (348), 279 states have internal predecessors, (348), 72 states have call successors, (72), 20 states have call predecessors, (72), 19 states have return successors, (71), 62 states have call predecessors, (71), 71 states have call successors, (71) [2022-11-03 02:27:12,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 491 transitions. [2022-11-03 02:27:12,435 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 491 transitions. Word has length 46 [2022-11-03 02:27:12,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:12,436 INFO L495 AbstractCegarLoop]: Abstraction has 362 states and 491 transitions. [2022-11-03 02:27:12,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-03 02:27:12,436 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 491 transitions. [2022-11-03 02:27:12,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-03 02:27:12,448 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:12,448 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:12,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:12,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 02:27:12,670 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:27:12,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:12,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1252121023, now seen corresponding path program 1 times [2022-11-03 02:27:12,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:12,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465892786] [2022-11-03 02:27:12,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:12,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:12,679 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:27:12,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1057076603] [2022-11-03 02:27:12,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:12,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:12,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:12,681 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:12,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 02:27:12,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:12,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:27:12,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:13,003 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-03 02:27:13,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 4 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-03 02:27:13,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:13,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465892786] [2022-11-03 02:27:13,407 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:27:13,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057076603] [2022-11-03 02:27:13,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057076603] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:13,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80367453] [2022-11-03 02:27:13,410 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:27:13,410 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:13,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:13,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:13,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:19,170 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2022-11-03 02:27:19,175 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:27:19,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:27:38,511 WARN L234 SmtUtils]: Spent 5.91s on a formula simplification. DAG size of input: 116 DAG size of output: 103 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:27:50,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6290#(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 [2022-11-03 02:27:50,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:27:50,516 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:27:50,516 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2022-11-03 02:27:50,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025265119] [2022-11-03 02:27:50,516 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:27:50,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 02:27:50,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:27:50,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 02:27:50,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2022-11-03 02:27:50,519 INFO L87 Difference]: Start difference. First operand 362 states and 491 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 02:27:52,549 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:27:54,935 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:27:55,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:27:55,282 INFO L93 Difference]: Finished difference Result 541 states and 748 transitions. [2022-11-03 02:27:55,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 02:27:55,282 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) Word has length 52 [2022-11-03 02:27:55,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:27:55,285 INFO L225 Difference]: With dead ends: 541 [2022-11-03 02:27:55,286 INFO L226 Difference]: Without dead ends: 373 [2022-11-03 02:27:55,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 02:27:55,288 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 72 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 33 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:27:55,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 181 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 193 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2022-11-03 02:27:55,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2022-11-03 02:27:55,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 326. [2022-11-03 02:27:55,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 245 states have (on average 1.2285714285714286) internal successors, (301), 250 states have internal predecessors, (301), 61 states have call successors, (61), 20 states have call predecessors, (61), 19 states have return successors, (60), 55 states have call predecessors, (60), 60 states have call successors, (60) [2022-11-03 02:27:55,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 422 transitions. [2022-11-03 02:27:55,393 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 422 transitions. Word has length 52 [2022-11-03 02:27:55,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:27:55,394 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 422 transitions. [2022-11-03 02:27:55,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (9), 5 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-03 02:27:55,394 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 422 transitions. [2022-11-03 02:27:55,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-03 02:27:55,400 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:27:55,400 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:27:55,440 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 02:27:55,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:55,614 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:27:55,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:27:55,614 INFO L85 PathProgramCache]: Analyzing trace with hash -703296414, now seen corresponding path program 1 times [2022-11-03 02:27:55,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:27:55,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110010172] [2022-11-03 02:27:55,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:55,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:27:55,625 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:27:55,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1916237720] [2022-11-03 02:27:55,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:27:55,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:27:55,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:27:55,627 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:27:55,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 02:27:55,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:27:55,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 02:27:55,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:27:55,782 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 64 proven. 12 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-03 02:27:55,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:27:55,887 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 38 proven. 12 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-11-03 02:27:55,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:27:55,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110010172] [2022-11-03 02:27:55,888 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:27:55,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1916237720] [2022-11-03 02:27:55,888 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1916237720] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:27:55,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410525086] [2022-11-03 02:27:55,891 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:27:55,891 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:27:55,892 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:27:55,892 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:27:55,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:27:58,716 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:27:58,781 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:27:58,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:03,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8073#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:03,049 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:03,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:03,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2022-11-03 02:28:03,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324785270] [2022-11-03 02:28:03,049 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:03,050 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:28:03,050 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:03,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:28:03,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:28:03,051 INFO L87 Difference]: Start difference. First operand 326 states and 422 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:28:03,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:03,216 INFO L93 Difference]: Finished difference Result 524 states and 700 transitions. [2022-11-03 02:28:03,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:28:03,217 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 82 [2022-11-03 02:28:03,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:03,220 INFO L225 Difference]: With dead ends: 524 [2022-11-03 02:28:03,220 INFO L226 Difference]: Without dead ends: 388 [2022-11-03 02:28:03,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-11-03 02:28:03,228 INFO L413 NwaCegarLoop]: 61 mSDtfsCounter, 17 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:03,229 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 117 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:28:03,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2022-11-03 02:28:03,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 377. [2022-11-03 02:28:03,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 283 states have (on average 1.243816254416961) internal successors, (352), 289 states have internal predecessors, (352), 74 states have call successors, (74), 20 states have call predecessors, (74), 19 states have return successors, (73), 67 states have call predecessors, (73), 73 states have call successors, (73) [2022-11-03 02:28:03,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 499 transitions. [2022-11-03 02:28:03,324 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 499 transitions. Word has length 82 [2022-11-03 02:28:03,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:03,324 INFO L495 AbstractCegarLoop]: Abstraction has 377 states and 499 transitions. [2022-11-03 02:28:03,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 02:28:03,325 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 499 transitions. [2022-11-03 02:28:03,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-03 02:28:03,327 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:03,328 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:03,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-03 02:28:03,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 02:28:03,538 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:03,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:03,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1378770924, now seen corresponding path program 2 times [2022-11-03 02:28:03,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:03,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128450923] [2022-11-03 02:28:03,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:03,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:03,550 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:03,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1709893358] [2022-11-03 02:28:03,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:28:03,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:03,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:03,553 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:03,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 02:28:03,705 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:28:03,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:03,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-03 02:28:03,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:03,730 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-03 02:28:03,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:28:03,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:03,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128450923] [2022-11-03 02:28:03,731 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:03,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709893358] [2022-11-03 02:28:03,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709893358] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:28:03,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:28:03,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:28:03,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710955163] [2022-11-03 02:28:03,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:28:03,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:28:03,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:03,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:28:03,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:28:03,733 INFO L87 Difference]: Start difference. First operand 377 states and 499 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:28:03,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:03,918 INFO L93 Difference]: Finished difference Result 639 states and 863 transitions. [2022-11-03 02:28:03,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-03 02:28:03,919 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 82 [2022-11-03 02:28:03,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:03,922 INFO L225 Difference]: With dead ends: 639 [2022-11-03 02:28:03,922 INFO L226 Difference]: Without dead ends: 478 [2022-11-03 02:28:03,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 02:28:03,924 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:03,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 133 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:28:03,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2022-11-03 02:28:04,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 443. [2022-11-03 02:28:04,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 338 states have (on average 1.227810650887574) internal successors, (415), 344 states have internal predecessors, (415), 83 states have call successors, (83), 22 states have call predecessors, (83), 21 states have return successors, (82), 76 states have call predecessors, (82), 82 states have call successors, (82) [2022-11-03 02:28:04,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 580 transitions. [2022-11-03 02:28:04,060 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 580 transitions. Word has length 82 [2022-11-03 02:28:04,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:04,060 INFO L495 AbstractCegarLoop]: Abstraction has 443 states and 580 transitions. [2022-11-03 02:28:04,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-11-03 02:28:04,061 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 580 transitions. [2022-11-03 02:28:04,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-03 02:28:04,063 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:04,063 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:04,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:04,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 02:28:04,269 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:04,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:04,271 INFO L85 PathProgramCache]: Analyzing trace with hash -760314426, now seen corresponding path program 3 times [2022-11-03 02:28:04,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:04,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640799456] [2022-11-03 02:28:04,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:04,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:04,294 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:04,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1169778829] [2022-11-03 02:28:04,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:28:04,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:04,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:04,302 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:04,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 02:28:04,484 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:28:04,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:04,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-03 02:28:04,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:04,694 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 152 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:28:04,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:04,984 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 24 proven. 40 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-03 02:28:04,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:04,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640799456] [2022-11-03 02:28:04,984 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:04,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169778829] [2022-11-03 02:28:04,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169778829] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:04,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145290153] [2022-11-03 02:28:04,989 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:04,989 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:04,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:04,990 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:04,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:07,670 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:28:07,714 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:28:07,741 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:10,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11753#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:10,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:10,083 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:10,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-03 02:28:10,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000830606] [2022-11-03 02:28:10,083 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:10,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 02:28:10,084 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:10,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 02:28:10,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=1274, Unknown=0, NotChecked=0, Total=1640 [2022-11-03 02:28:10,085 INFO L87 Difference]: Start difference. First operand 443 states and 580 transitions. Second operand has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-03 02:28:11,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:11,380 INFO L93 Difference]: Finished difference Result 1283 states and 1794 transitions. [2022-11-03 02:28:11,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-03 02:28:11,381 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) Word has length 82 [2022-11-03 02:28:11,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:11,388 INFO L225 Difference]: With dead ends: 1283 [2022-11-03 02:28:11,389 INFO L226 Difference]: Without dead ends: 1196 [2022-11-03 02:28:11,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1087 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=678, Invalid=2514, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:28:11,395 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 434 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 434 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:11,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [434 Valid, 402 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 02:28:11,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2022-11-03 02:28:11,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 1136. [2022-11-03 02:28:11,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1136 states, 859 states have (on average 1.2421420256111757) internal successors, (1067), 868 states have internal predecessors, (1067), 239 states have call successors, (239), 38 states have call predecessors, (239), 37 states have return successors, (238), 229 states have call predecessors, (238), 238 states have call successors, (238) [2022-11-03 02:28:11,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1136 states to 1136 states and 1544 transitions. [2022-11-03 02:28:11,744 INFO L78 Accepts]: Start accepts. Automaton has 1136 states and 1544 transitions. Word has length 82 [2022-11-03 02:28:11,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:11,744 INFO L495 AbstractCegarLoop]: Abstraction has 1136 states and 1544 transitions. [2022-11-03 02:28:11,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.181818181818182) internal successors, (92), 22 states have internal predecessors, (92), 19 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (20), 18 states have call predecessors, (20), 18 states have call successors, (20) [2022-11-03 02:28:11,745 INFO L276 IsEmpty]: Start isEmpty. Operand 1136 states and 1544 transitions. [2022-11-03 02:28:11,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-03 02:28:11,747 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:11,747 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:11,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:11,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 02:28:11,962 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:11,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:11,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1887960563, now seen corresponding path program 1 times [2022-11-03 02:28:11,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:11,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109804312] [2022-11-03 02:28:11,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:11,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:11,977 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:11,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1957025191] [2022-11-03 02:28:11,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:11,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:11,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:11,979 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:11,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 02:28:12,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:12,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-03 02:28:12,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 190 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:28:12,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:12,594 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 22 proven. 46 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-11-03 02:28:12,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:12,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109804312] [2022-11-03 02:28:12,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:12,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957025191] [2022-11-03 02:28:12,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957025191] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:12,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699329063] [2022-11-03 02:28:12,599 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:12,600 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:12,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:12,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:12,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:16,417 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:28:16,424 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:28:16,458 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:23,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15911#(and (<= ~counter~0 103) (= |__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 [2022-11-03 02:28:23,084 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:23,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:23,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 24 [2022-11-03 02:28:23,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901265026] [2022-11-03 02:28:23,085 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:23,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 02:28:23,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:23,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 02:28:23,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=1480, Unknown=0, NotChecked=0, Total=1892 [2022-11-03 02:28:23,088 INFO L87 Difference]: Start difference. First operand 1136 states and 1544 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-03 02:28:24,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:24,493 INFO L93 Difference]: Finished difference Result 1692 states and 2276 transitions. [2022-11-03 02:28:24,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-03 02:28:24,494 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) Word has length 88 [2022-11-03 02:28:24,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:24,499 INFO L225 Difference]: With dead ends: 1692 [2022-11-03 02:28:24,499 INFO L226 Difference]: Without dead ends: 924 [2022-11-03 02:28:24,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1228 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=760, Invalid=2900, Unknown=0, NotChecked=0, Total=3660 [2022-11-03 02:28:24,504 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 524 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 317 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 524 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 317 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:24,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [524 Valid, 406 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [317 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:28:24,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 924 states. [2022-11-03 02:28:24,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 924 to 868. [2022-11-03 02:28:24,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 868 states, 653 states have (on average 1.1929555895865238) internal successors, (779), 658 states have internal predecessors, (779), 173 states have call successors, (173), 42 states have call predecessors, (173), 41 states have return successors, (172), 167 states have call predecessors, (172), 172 states have call successors, (172) [2022-11-03 02:28:24,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 868 states to 868 states and 1124 transitions. [2022-11-03 02:28:24,766 INFO L78 Accepts]: Start accepts. Automaton has 868 states and 1124 transitions. Word has length 88 [2022-11-03 02:28:24,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:24,766 INFO L495 AbstractCegarLoop]: Abstraction has 868 states and 1124 transitions. [2022-11-03 02:28:24,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 21 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (22), 20 states have call predecessors, (22), 20 states have call successors, (22) [2022-11-03 02:28:24,767 INFO L276 IsEmpty]: Start isEmpty. Operand 868 states and 1124 transitions. [2022-11-03 02:28:24,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-03 02:28:24,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:24,769 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:24,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:24,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:24,983 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:24,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:24,983 INFO L85 PathProgramCache]: Analyzing trace with hash -890970028, now seen corresponding path program 1 times [2022-11-03 02:28:24,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:24,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016800019] [2022-11-03 02:28:24,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:24,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:24,994 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:24,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1423913351] [2022-11-03 02:28:24,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:24,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:24,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:24,996 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:25,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 02:28:25,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:25,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 02:28:25,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:25,275 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 236 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:28:25,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:25,615 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 20 proven. 56 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2022-11-03 02:28:25,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:25,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016800019] [2022-11-03 02:28:25,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:25,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423913351] [2022-11-03 02:28:25,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423913351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:25,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406479497] [2022-11-03 02:28:25,618 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:25,619 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:25,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:25,619 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:25,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:30,351 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:28:30,356 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:28:30,386 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:36,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20293#(and (<= ~counter~0 102) (= |__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 [2022-11-03 02:28:36,595 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:36,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:36,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2022-11-03 02:28:36,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823241861] [2022-11-03 02:28:36,595 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:36,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-03 02:28:36,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:36,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-03 02:28:36,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=457, Invalid=1523, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 02:28:36,598 INFO L87 Difference]: Start difference. First operand 868 states and 1124 transitions. Second operand has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-03 02:28:37,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:37,966 INFO L93 Difference]: Finished difference Result 992 states and 1292 transitions. [2022-11-03 02:28:37,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-03 02:28:37,967 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 94 [2022-11-03 02:28:37,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:37,972 INFO L225 Difference]: With dead ends: 992 [2022-11-03 02:28:37,973 INFO L226 Difference]: Without dead ends: 987 [2022-11-03 02:28:37,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 235 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=846, Invalid=3060, Unknown=0, NotChecked=0, Total=3906 [2022-11-03 02:28:37,977 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 553 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 386 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 553 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 386 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:37,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [553 Valid, 521 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [386 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 02:28:37,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 987 states. [2022-11-03 02:28:38,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 987 to 971. [2022-11-03 02:28:38,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 971 states, 734 states have (on average 1.1702997275204359) internal successors, (859), 740 states have internal predecessors, (859), 191 states have call successors, (191), 46 states have call predecessors, (191), 45 states have return successors, (190), 184 states have call predecessors, (190), 190 states have call successors, (190) [2022-11-03 02:28:38,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 971 states to 971 states and 1240 transitions. [2022-11-03 02:28:38,264 INFO L78 Accepts]: Start accepts. Automaton has 971 states and 1240 transitions. Word has length 94 [2022-11-03 02:28:38,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:38,265 INFO L495 AbstractCegarLoop]: Abstraction has 971 states and 1240 transitions. [2022-11-03 02:28:38,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.076923076923077) internal successors, (106), 26 states have internal predecessors, (106), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-03 02:28:38,266 INFO L276 IsEmpty]: Start isEmpty. Operand 971 states and 1240 transitions. [2022-11-03 02:28:38,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:28:38,272 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:38,273 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:38,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:38,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 02:28:38,486 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:38,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:38,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1384815896, now seen corresponding path program 4 times [2022-11-03 02:28:38,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:38,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523484195] [2022-11-03 02:28:38,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:38,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:38,499 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:38,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [512872328] [2022-11-03 02:28:38,500 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:28:38,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:38,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:38,502 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:38,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 02:28:38,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:38,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 02:28:38,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:38,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 612 proven. 0 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2022-11-03 02:28:38,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:28:38,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523484195] [2022-11-03 02:28:38,634 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:38,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512872328] [2022-11-03 02:28:38,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512872328] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:28:38,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:28:38,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 02:28:38,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457043794] [2022-11-03 02:28:38,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:28:38,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 02:28:38,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:38,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 02:28:38,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:28:38,636 INFO L87 Difference]: Start difference. First operand 971 states and 1240 transitions. Second operand has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 02:28:38,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:38,960 INFO L93 Difference]: Finished difference Result 1566 states and 2026 transitions. [2022-11-03 02:28:38,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 02:28:38,961 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 178 [2022-11-03 02:28:38,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:38,972 INFO L225 Difference]: With dead ends: 1566 [2022-11-03 02:28:38,972 INFO L226 Difference]: Without dead ends: 1035 [2022-11-03 02:28:38,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 02:28:38,975 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 3 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:38,976 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 66 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:28:38,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2022-11-03 02:28:39,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 962. [2022-11-03 02:28:39,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 962 states, 730 states have (on average 1.1602739726027398) internal successors, (847), 739 states have internal predecessors, (847), 186 states have call successors, (186), 46 states have call predecessors, (186), 45 states have return successors, (185), 176 states have call predecessors, (185), 185 states have call successors, (185) [2022-11-03 02:28:39,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 962 states to 962 states and 1218 transitions. [2022-11-03 02:28:39,237 INFO L78 Accepts]: Start accepts. Automaton has 962 states and 1218 transitions. Word has length 178 [2022-11-03 02:28:39,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:39,238 INFO L495 AbstractCegarLoop]: Abstraction has 962 states and 1218 transitions. [2022-11-03 02:28:39,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.0) internal successors, (45), 3 states have internal predecessors, (45), 3 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-03 02:28:39,238 INFO L276 IsEmpty]: Start isEmpty. Operand 962 states and 1218 transitions. [2022-11-03 02:28:39,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:28:39,244 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:39,244 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 9, 8, 8, 8, 8, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:39,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:39,457 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 02:28:39,458 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:39,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:39,458 INFO L85 PathProgramCache]: Analyzing trace with hash 437435780, now seen corresponding path program 5 times [2022-11-03 02:28:39,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:39,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038948393] [2022-11-03 02:28:39,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:39,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:39,475 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:39,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1680807089] [2022-11-03 02:28:39,475 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:28:39,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:39,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:39,477 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:39,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 02:28:41,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-03 02:28:41,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:41,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 02:28:41,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:41,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1078 backedges. 120 proven. 0 refuted. 0 times theorem prover too weak. 958 trivial. 0 not checked. [2022-11-03 02:28:41,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 02:28:41,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:41,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038948393] [2022-11-03 02:28:41,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:41,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680807089] [2022-11-03 02:28:41,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680807089] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:28:41,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:28:41,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 02:28:41,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250843110] [2022-11-03 02:28:41,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:28:41,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 02:28:41,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:41,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 02:28:41,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:28:41,445 INFO L87 Difference]: Start difference. First operand 962 states and 1218 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-03 02:28:41,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:41,693 INFO L93 Difference]: Finished difference Result 974 states and 1228 transitions. [2022-11-03 02:28:41,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 02:28:41,694 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 178 [2022-11-03 02:28:41,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:41,699 INFO L225 Difference]: With dead ends: 974 [2022-11-03 02:28:41,699 INFO L226 Difference]: Without dead ends: 923 [2022-11-03 02:28:41,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-03 02:28:41,701 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 12 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:41,701 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 101 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:28:41,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 923 states. [2022-11-03 02:28:41,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 923 to 908. [2022-11-03 02:28:41,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 688 states have (on average 1.1555232558139534) internal successors, (795), 695 states have internal predecessors, (795), 174 states have call successors, (174), 46 states have call predecessors, (174), 45 states have return successors, (173), 166 states have call predecessors, (173), 173 states have call successors, (173) [2022-11-03 02:28:41,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1142 transitions. [2022-11-03 02:28:41,975 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1142 transitions. Word has length 178 [2022-11-03 02:28:41,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:41,975 INFO L495 AbstractCegarLoop]: Abstraction has 908 states and 1142 transitions. [2022-11-03 02:28:41,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 4 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-03 02:28:41,976 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1142 transitions. [2022-11-03 02:28:41,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:28:41,982 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:41,983 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:41,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:42,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:42,191 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:42,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:42,191 INFO L85 PathProgramCache]: Analyzing trace with hash -223810874, now seen corresponding path program 6 times [2022-11-03 02:28:42,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:42,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768332460] [2022-11-03 02:28:42,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:42,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:42,201 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:42,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2138971790] [2022-11-03 02:28:42,202 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:28:42,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:42,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:42,203 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:42,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 02:28:42,318 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:28:42,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:28:42,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:28:42,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:42,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 280 proven. 184 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2022-11-03 02:28:42,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:42,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 140 proven. 184 refuted. 0 times theorem prover too weak. 782 trivial. 0 not checked. [2022-11-03 02:28:42,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:42,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768332460] [2022-11-03 02:28:42,746 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:42,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138971790] [2022-11-03 02:28:42,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138971790] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:42,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [162103635] [2022-11-03 02:28:42,748 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:42,748 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:42,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:42,749 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:42,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:45,130 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:28:45,181 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:28:45,214 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:49,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31789#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-03 02:28:49,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:49,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:49,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2022-11-03 02:28:49,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139822101] [2022-11-03 02:28:49,710 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:49,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 02:28:49,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:49,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 02:28:49,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:28:49,712 INFO L87 Difference]: Start difference. First operand 908 states and 1142 transitions. Second operand has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-03 02:28:51,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:28:51,222 INFO L93 Difference]: Finished difference Result 1913 states and 2523 transitions. [2022-11-03 02:28:51,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 02:28:51,223 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) Word has length 178 [2022-11-03 02:28:51,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:28:51,231 INFO L225 Difference]: With dead ends: 1913 [2022-11-03 02:28:51,232 INFO L226 Difference]: Without dead ends: 1690 [2022-11-03 02:28:51,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 499 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=190, Invalid=1616, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 02:28:51,235 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 108 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 939 SdHoareTripleChecker+Invalid, 927 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:28:51,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 939 Invalid, 927 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:28:51,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2022-11-03 02:28:51,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1491. [2022-11-03 02:28:51,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1491 states, 1129 states have (on average 1.174490699734278) internal successors, (1326), 1145 states have internal predecessors, (1326), 316 states have call successors, (316), 46 states have call predecessors, (316), 45 states have return successors, (315), 299 states have call predecessors, (315), 315 states have call successors, (315) [2022-11-03 02:28:51,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1491 states to 1491 states and 1957 transitions. [2022-11-03 02:28:51,709 INFO L78 Accepts]: Start accepts. Automaton has 1491 states and 1957 transitions. Word has length 178 [2022-11-03 02:28:51,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:28:51,710 INFO L495 AbstractCegarLoop]: Abstraction has 1491 states and 1957 transitions. [2022-11-03 02:28:51,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.3) internal successors, (73), 10 states have internal predecessors, (73), 10 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 10 states have call successors, (21) [2022-11-03 02:28:51,710 INFO L276 IsEmpty]: Start isEmpty. Operand 1491 states and 1957 transitions. [2022-11-03 02:28:51,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:28:51,718 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:28:51,718 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 10, 9, 9, 9, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:28:51,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 02:28:51,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:51,942 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:28:51,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:28:51,942 INFO L85 PathProgramCache]: Analyzing trace with hash -654614764, now seen corresponding path program 7 times [2022-11-03 02:28:51,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:28:51,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311646510] [2022-11-03 02:28:51,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:28:51,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:28:51,968 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:28:51,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1660810165] [2022-11-03 02:28:51,968 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:28:51,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:28:51,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:28:51,970 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:28:52,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 02:28:52,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:28:52,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 13 conjunts are in the unsatisfiable core [2022-11-03 02:28:52,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:28:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 516 proven. 84 refuted. 0 times theorem prover too weak. 494 trivial. 0 not checked. [2022-11-03 02:28:52,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:28:52,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 226 proven. 84 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2022-11-03 02:28:52,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:28:52,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311646510] [2022-11-03 02:28:52,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:28:52,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660810165] [2022-11-03 02:28:52,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660810165] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:28:52,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1693837937] [2022-11-03 02:28:52,582 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:28:52,582 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:28:52,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:28:52,583 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:28:52,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:28:55,552 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:28:55,615 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:28:55,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:28:58,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37948#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:28:58,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:28:58,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:28:58,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-11-03 02:28:58,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8770001] [2022-11-03 02:28:58,575 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:28:58,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:28:58,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:28:58,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:28:58,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 02:28:58,577 INFO L87 Difference]: Start difference. First operand 1491 states and 1957 transitions. Second operand has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-03 02:29:00,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:00,951 INFO L93 Difference]: Finished difference Result 3076 states and 4153 transitions. [2022-11-03 02:29:00,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-03 02:29:00,951 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) Word has length 178 [2022-11-03 02:29:00,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:00,965 INFO L225 Difference]: With dead ends: 3076 [2022-11-03 02:29:00,965 INFO L226 Difference]: Without dead ends: 2753 [2022-11-03 02:29:00,968 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 525 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 778 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=448, Invalid=2744, Unknown=0, NotChecked=0, Total=3192 [2022-11-03 02:29:00,969 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 212 mSDsluCounter, 512 mSDsCounter, 0 mSdLazyCounter, 728 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:00,970 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [217 Valid, 662 Invalid, 841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 728 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-03 02:29:00,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2753 states. [2022-11-03 02:29:01,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2753 to 2155. [2022-11-03 02:29:01,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2155 states, 1626 states have (on average 1.1672816728167281) internal successors, (1898), 1654 states have internal predecessors, (1898), 483 states have call successors, (483), 46 states have call predecessors, (483), 45 states have return successors, (482), 454 states have call predecessors, (482), 482 states have call successors, (482) [2022-11-03 02:29:01,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2155 states to 2155 states and 2863 transitions. [2022-11-03 02:29:01,731 INFO L78 Accepts]: Start accepts. Automaton has 2155 states and 2863 transitions. Word has length 178 [2022-11-03 02:29:01,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:01,732 INFO L495 AbstractCegarLoop]: Abstraction has 2155 states and 2863 transitions. [2022-11-03 02:29:01,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.5) internal successors, (105), 14 states have internal predecessors, (105), 14 states have call successors, (36), 2 states have call predecessors, (36), 2 states have return successors, (35), 14 states have call predecessors, (35), 14 states have call successors, (35) [2022-11-03 02:29:01,732 INFO L276 IsEmpty]: Start isEmpty. Operand 2155 states and 2863 transitions. [2022-11-03 02:29:01,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:29:01,743 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:01,743 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:29:01,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 02:29:01,957 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 02:29:01,957 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:29:01,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:01,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1253226182, now seen corresponding path program 8 times [2022-11-03 02:29:01,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:01,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103421224] [2022-11-03 02:29:01,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:01,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:01,998 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:29:01,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [5535274] [2022-11-03 02:29:01,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:29:01,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:01,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:02,014 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:02,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 02:29:03,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-03 02:29:03,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:29:03,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-03 02:29:03,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:04,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-03 02:29:04,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:04,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 84 proven. 248 refuted. 0 times theorem prover too weak. 774 trivial. 0 not checked. [2022-11-03 02:29:04,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:04,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103421224] [2022-11-03 02:29:04,518 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:29:04,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5535274] [2022-11-03 02:29:04,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5535274] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:04,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [513816065] [2022-11-03 02:29:04,520 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:29:04,520 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:04,521 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:04,521 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:04,521 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:08,298 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:29:08,303 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:29:08,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:22,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46910#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:22,902 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:22,902 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:29:22,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2022-11-03 02:29:22,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038963241] [2022-11-03 02:29:22,903 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:22,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:29:22,904 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:22,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:29:22,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1421, Unknown=0, NotChecked=0, Total=1560 [2022-11-03 02:29:22,905 INFO L87 Difference]: Start difference. First operand 2155 states and 2863 transitions. Second operand has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-03 02:29:27,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:27,436 INFO L93 Difference]: Finished difference Result 3671 states and 4982 transitions. [2022-11-03 02:29:27,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-03 02:29:27,440 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) Word has length 178 [2022-11-03 02:29:27,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:27,459 INFO L225 Difference]: With dead ends: 3671 [2022-11-03 02:29:27,459 INFO L226 Difference]: Without dead ends: 3360 [2022-11-03 02:29:27,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 492 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1474 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=517, Invalid=4885, Unknown=0, NotChecked=0, Total=5402 [2022-11-03 02:29:27,464 INFO L413 NwaCegarLoop]: 305 mSDtfsCounter, 283 mSDsluCounter, 1654 mSDsCounter, 0 mSdLazyCounter, 2347 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 1946 SdHoareTripleChecker+Invalid, 2515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 2347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:27,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [291 Valid, 1946 Invalid, 2515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 2347 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-03 02:29:27,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3360 states. [2022-11-03 02:29:28,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3360 to 2697. [2022-11-03 02:29:28,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2697 states, 2036 states have (on average 1.1792730844793713) internal successors, (2401), 2078 states have internal predecessors, (2401), 615 states have call successors, (615), 46 states have call predecessors, (615), 45 states have return successors, (614), 572 states have call predecessors, (614), 614 states have call successors, (614) [2022-11-03 02:29:28,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2697 states to 2697 states and 3630 transitions. [2022-11-03 02:29:28,307 INFO L78 Accepts]: Start accepts. Automaton has 2697 states and 3630 transitions. Word has length 178 [2022-11-03 02:29:28,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:28,308 INFO L495 AbstractCegarLoop]: Abstraction has 2697 states and 3630 transitions. [2022-11-03 02:29:28,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.0) internal successors, (108), 18 states have internal predecessors, (108), 18 states have call successors, (33), 2 states have call predecessors, (33), 1 states have return successors, (32), 17 states have call predecessors, (32), 17 states have call successors, (32) [2022-11-03 02:29:28,309 INFO L276 IsEmpty]: Start isEmpty. Operand 2697 states and 3630 transitions. [2022-11-03 02:29:28,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-03 02:29:28,321 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:28,322 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 11, 10, 10, 10, 7, 7, 6, 6, 6, 5, 4, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:29:28,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-03 02:29:28,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-03 02:29:28,531 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:29:28,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:28,531 INFO L85 PathProgramCache]: Analyzing trace with hash 2135458502, now seen corresponding path program 9 times [2022-11-03 02:29:28,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:28,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738828430] [2022-11-03 02:29:28,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:28,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:28,543 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:29:28,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1474113950] [2022-11-03 02:29:28,544 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:29:28,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:28,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:28,545 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:28,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 02:29:28,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:29:28,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:29:28,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-03 02:29:28,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:29,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 1044 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:29:29,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:30,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 60 proven. 284 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2022-11-03 02:29:30,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:30,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738828430] [2022-11-03 02:29:30,354 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:29:30,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474113950] [2022-11-03 02:29:30,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474113950] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:30,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1554234518] [2022-11-03 02:29:30,356 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:29:30,356 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:30,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:30,357 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:30,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:32,882 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:29:32,934 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:29:32,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:29:37,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57625#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:29:37,382 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:29:37,382 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:29:37,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24] total 46 [2022-11-03 02:29:37,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156005051] [2022-11-03 02:29:37,383 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:29:37,384 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-03 02:29:37,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:29:37,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-03 02:29:37,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=2918, Unknown=0, NotChecked=0, Total=4160 [2022-11-03 02:29:37,386 INFO L87 Difference]: Start difference. First operand 2697 states and 3630 transitions. Second operand has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-03 02:29:43,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:29:43,226 INFO L93 Difference]: Finished difference Result 10790 states and 16088 transitions. [2022-11-03 02:29:43,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-03 02:29:43,227 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) Word has length 178 [2022-11-03 02:29:43,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:29:43,285 INFO L225 Difference]: With dead ends: 10790 [2022-11-03 02:29:43,285 INFO L226 Difference]: Without dead ends: 10651 [2022-11-03 02:29:43,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3073 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2982, Invalid=7938, Unknown=0, NotChecked=0, Total=10920 [2022-11-03 02:29:43,293 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 1472 mSDsluCounter, 871 mSDsCounter, 0 mSdLazyCounter, 763 mSolverCounterSat, 933 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1472 SdHoareTripleChecker+Valid, 1013 SdHoareTripleChecker+Invalid, 1696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 933 IncrementalHoareTripleChecker+Valid, 763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:29:43,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1472 Valid, 1013 Invalid, 1696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [933 Valid, 763 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-03 02:29:43,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10651 states. [2022-11-03 02:29:46,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10651 to 10396. [2022-11-03 02:29:46,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10396 states, 7815 states have (on average 1.2519513755598208) internal successors, (9784), 7878 states have internal predecessors, (9784), 2495 states have call successors, (2495), 86 states have call predecessors, (2495), 85 states have return successors, (2494), 2431 states have call predecessors, (2494), 2494 states have call successors, (2494) [2022-11-03 02:29:46,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10396 states to 10396 states and 14773 transitions. [2022-11-03 02:29:46,289 INFO L78 Accepts]: Start accepts. Automaton has 10396 states and 14773 transitions. Word has length 178 [2022-11-03 02:29:46,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:29:46,290 INFO L495 AbstractCegarLoop]: Abstraction has 10396 states and 14773 transitions. [2022-11-03 02:29:46,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 4.3478260869565215) internal successors, (200), 46 states have internal predecessors, (200), 43 states have call successors, (45), 23 states have call predecessors, (45), 22 states have return successors, (44), 42 states have call predecessors, (44), 42 states have call successors, (44) [2022-11-03 02:29:46,291 INFO L276 IsEmpty]: Start isEmpty. Operand 10396 states and 14773 transitions. [2022-11-03 02:29:46,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-11-03 02:29:46,304 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:29:46,304 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 10, 10, 10, 10, 8, 7, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:29:46,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-11-03 02:29:46,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:46,530 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:29:46,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:29:46,530 INFO L85 PathProgramCache]: Analyzing trace with hash 97743629, now seen corresponding path program 2 times [2022-11-03 02:29:46,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:29:46,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565421753] [2022-11-03 02:29:46,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:29:46,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:29:46,541 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:29:46,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1723103296] [2022-11-03 02:29:46,542 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:29:46,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:29:46,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:29:46,543 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:29:46,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 02:29:47,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:29:47,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:29:47,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-03 02:29:47,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:29:48,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 1142 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:29:48,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:29:49,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1194 backedges. 50 proven. 302 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2022-11-03 02:29:49,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:29:49,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565421753] [2022-11-03 02:29:49,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:29:49,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723103296] [2022-11-03 02:29:49,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723103296] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:29:49,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1106968526] [2022-11-03 02:29:49,370 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:29:49,371 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:29:49,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:29:49,371 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:29:49,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:29:53,410 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:29:53,416 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:29:53,448 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:01,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90528#(and (<= ~counter~0 103) (= |__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 [2022-11-03 02:30:01,486 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:01,486 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:30:01,486 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 48 [2022-11-03 02:30:01,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985196885] [2022-11-03 02:30:01,486 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:01,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-03 02:30:01,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:01,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-03 02:30:01,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=3220, Unknown=0, NotChecked=0, Total=4556 [2022-11-03 02:30:01,489 INFO L87 Difference]: Start difference. First operand 10396 states and 14773 transitions. Second operand has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-03 02:30:06,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:06,784 INFO L93 Difference]: Finished difference Result 15637 states and 22379 transitions. [2022-11-03 02:30:06,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-11-03 02:30:06,785 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) Word has length 184 [2022-11-03 02:30:06,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:06,822 INFO L225 Difference]: With dead ends: 15637 [2022-11-03 02:30:06,823 INFO L226 Difference]: Without dead ends: 7986 [2022-11-03 02:30:06,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 484 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3286 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=3160, Invalid=8612, Unknown=0, NotChecked=0, Total=11772 [2022-11-03 02:30:06,848 INFO L413 NwaCegarLoop]: 150 mSDtfsCounter, 1445 mSDsluCounter, 841 mSDsCounter, 0 mSdLazyCounter, 834 mSolverCounterSat, 976 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1445 SdHoareTripleChecker+Valid, 989 SdHoareTripleChecker+Invalid, 1810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 976 IncrementalHoareTripleChecker+Valid, 834 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:06,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1445 Valid, 989 Invalid, 1810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [976 Valid, 834 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-03 02:30:06,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7986 states. [2022-11-03 02:30:09,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7986 to 7755. [2022-11-03 02:30:09,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7755 states, 5819 states have (on average 1.1802715243168929) internal successors, (6868), 5867 states have internal predecessors, (6868), 1846 states have call successors, (1846), 90 states have call predecessors, (1846), 89 states have return successors, (1845), 1797 states have call predecessors, (1845), 1845 states have call successors, (1845) [2022-11-03 02:30:09,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7755 states to 7755 states and 10559 transitions. [2022-11-03 02:30:09,108 INFO L78 Accepts]: Start accepts. Automaton has 7755 states and 10559 transitions. Word has length 184 [2022-11-03 02:30:09,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:09,109 INFO L495 AbstractCegarLoop]: Abstraction has 7755 states and 10559 transitions. [2022-11-03 02:30:09,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 4.3125) internal successors, (207), 48 states have internal predecessors, (207), 45 states have call successors, (47), 24 states have call predecessors, (47), 23 states have return successors, (46), 44 states have call predecessors, (46), 44 states have call successors, (46) [2022-11-03 02:30:09,110 INFO L276 IsEmpty]: Start isEmpty. Operand 7755 states and 10559 transitions. [2022-11-03 02:30:09,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-11-03 02:30:09,123 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:09,123 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 10, 10, 10, 10, 8, 8, 8, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:09,137 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:09,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 02:30:09,332 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:09,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:09,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1898418516, now seen corresponding path program 2 times [2022-11-03 02:30:09,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:09,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099327289] [2022-11-03 02:30:09,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:09,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:09,346 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:30:09,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [755604015] [2022-11-03 02:30:09,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:30:09,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:09,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:09,348 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:09,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 02:30:29,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 02:30:29,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:30:29,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 47 conjunts are in the unsatisfiable core [2022-11-03 02:30:29,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:30,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 1248 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:30:30,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:31,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1294 backedges. 44 proven. 324 refuted. 0 times theorem prover too weak. 926 trivial. 0 not checked. [2022-11-03 02:30:31,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:31,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099327289] [2022-11-03 02:30:31,454 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:30:31,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755604015] [2022-11-03 02:30:31,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755604015] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:31,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1079168894] [2022-11-03 02:30:31,456 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:30:31,456 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:31,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:31,457 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:31,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:35,095 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:30:35,100 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:30:35,132 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:30:44,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '126742#(and (<= ~counter~0 102) (= |__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 [2022-11-03 02:30:44,840 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:30:44,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:30:44,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2022-11-03 02:30:44,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058253616] [2022-11-03 02:30:44,841 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:30:44,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-03 02:30:44,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:30:44,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-03 02:30:44,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=3263, Unknown=0, NotChecked=0, Total=4692 [2022-11-03 02:30:44,843 INFO L87 Difference]: Start difference. First operand 7755 states and 10559 transitions. Second operand has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-03 02:30:50,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:30:50,360 INFO L93 Difference]: Finished difference Result 8408 states and 11491 transitions. [2022-11-03 02:30:50,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2022-11-03 02:30:50,361 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 190 [2022-11-03 02:30:50,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:30:50,390 INFO L225 Difference]: With dead ends: 8408 [2022-11-03 02:30:50,390 INFO L226 Difference]: Without dead ends: 8261 [2022-11-03 02:30:50,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 497 SyntacticMatches, 4 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=3342, Invalid=8868, Unknown=0, NotChecked=0, Total=12210 [2022-11-03 02:30:50,396 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 1301 mSDsluCounter, 829 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 903 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1301 SdHoareTripleChecker+Valid, 983 SdHoareTripleChecker+Invalid, 1775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 903 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-03 02:30:50,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1301 Valid, 983 Invalid, 1775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [903 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-03 02:30:50,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8261 states. [2022-11-03 02:30:52,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8261 to 7551. [2022-11-03 02:30:52,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7551 states, 5676 states have (on average 1.1243833685694151) internal successors, (6382), 5720 states have internal predecessors, (6382), 1781 states have call successors, (1781), 94 states have call predecessors, (1781), 93 states have return successors, (1780), 1736 states have call predecessors, (1780), 1780 states have call successors, (1780) [2022-11-03 02:30:52,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7551 states to 7551 states and 9943 transitions. [2022-11-03 02:30:52,607 INFO L78 Accepts]: Start accepts. Automaton has 7551 states and 9943 transitions. Word has length 190 [2022-11-03 02:30:52,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:30:52,608 INFO L495 AbstractCegarLoop]: Abstraction has 7551 states and 9943 transitions. [2022-11-03 02:30:52,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.28) internal successors, (214), 50 states have internal predecessors, (214), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2022-11-03 02:30:52,608 INFO L276 IsEmpty]: Start isEmpty. Operand 7551 states and 9943 transitions. [2022-11-03 02:30:52,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-03 02:30:52,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:30:52,648 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:30:52,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 02:30:52,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-03 02:30:52,864 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:30:52,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:30:52,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1302721490, now seen corresponding path program 10 times [2022-11-03 02:30:52,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:30:52,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951780680] [2022-11-03 02:30:52,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:30:52,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:30:52,894 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:30:52,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1390841041] [2022-11-03 02:30:52,894 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:30:52,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:30:52,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:30:52,897 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:30:52,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 02:30:53,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:30:53,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 02:30:53,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:30:54,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 416 proven. 1164 refuted. 0 times theorem prover too weak. 3690 trivial. 0 not checked. [2022-11-03 02:30:54,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:30:55,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 266 proven. 1204 refuted. 0 times theorem prover too weak. 3800 trivial. 0 not checked. [2022-11-03 02:30:55,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:30:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951780680] [2022-11-03 02:30:55,264 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:30:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390841041] [2022-11-03 02:30:55,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390841041] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:30:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [675599887] [2022-11-03 02:30:55,266 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:30:55,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:30:55,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:30:55,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:30:55,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:30:58,243 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:30:58,297 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:30:58,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:03,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152893#(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 [2022-11-03 02:31:03,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:03,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:31:03,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 32 [2022-11-03 02:31:03,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656855776] [2022-11-03 02:31:03,080 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:03,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-03 02:31:03,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:03,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-03 02:31:03,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2365, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 02:31:03,083 INFO L87 Difference]: Start difference. First operand 7551 states and 9943 transitions. Second operand has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-03 02:31:09,577 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:11,581 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:13,717 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-11-03 02:31:16,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:31:16,232 INFO L93 Difference]: Finished difference Result 10909 states and 14419 transitions. [2022-11-03 02:31:16,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-03 02:31:16,233 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) Word has length 370 [2022-11-03 02:31:16,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:31:16,267 INFO L225 Difference]: With dead ends: 10909 [2022-11-03 02:31:16,267 INFO L226 Difference]: Without dead ends: 9151 [2022-11-03 02:31:16,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1136 GetRequests, 1057 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1405 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=581, Invalid=5581, Unknown=0, NotChecked=0, Total=6162 [2022-11-03 02:31:16,276 INFO L413 NwaCegarLoop]: 305 mSDtfsCounter, 361 mSDsluCounter, 2762 mSDsCounter, 0 mSdLazyCounter, 3135 mSolverCounterSat, 183 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 3050 SdHoareTripleChecker+Invalid, 3321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 3135 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:31:16,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [367 Valid, 3050 Invalid, 3321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 3135 Invalid, 3 Unknown, 0 Unchecked, 8.8s Time] [2022-11-03 02:31:16,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9151 states. [2022-11-03 02:31:18,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9151 to 7664. [2022-11-03 02:31:18,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7664 states, 5761 states have (on average 1.1246311404270093) internal successors, (6479), 5806 states have internal predecessors, (6479), 1809 states have call successors, (1809), 94 states have call predecessors, (1809), 93 states have return successors, (1808), 1763 states have call predecessors, (1808), 1808 states have call successors, (1808) [2022-11-03 02:31:18,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7664 states to 7664 states and 10096 transitions. [2022-11-03 02:31:18,627 INFO L78 Accepts]: Start accepts. Automaton has 7664 states and 10096 transitions. Word has length 370 [2022-11-03 02:31:18,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:31:18,628 INFO L495 AbstractCegarLoop]: Abstraction has 7664 states and 10096 transitions. [2022-11-03 02:31:18,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 7.34375) internal successors, (235), 32 states have internal predecessors, (235), 32 states have call successors, (75), 2 states have call predecessors, (75), 2 states have return successors, (74), 32 states have call predecessors, (74), 32 states have call successors, (74) [2022-11-03 02:31:18,629 INFO L276 IsEmpty]: Start isEmpty. Operand 7664 states and 10096 transitions. [2022-11-03 02:31:18,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-03 02:31:18,664 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:31:18,665 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:31:18,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-03 02:31:18,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 02:31:18,880 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:31:18,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:31:18,881 INFO L85 PathProgramCache]: Analyzing trace with hash -467354670, now seen corresponding path program 11 times [2022-11-03 02:31:18,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:31:18,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097224059] [2022-11-03 02:31:18,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:31:18,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:31:18,905 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:31:18,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1670135165] [2022-11-03 02:31:18,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:31:18,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:31:18,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:31:18,907 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:31:18,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 02:31:22,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-11-03 02:31:22,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:31:22,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 27 conjunts are in the unsatisfiable core [2022-11-03 02:31:22,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:31:23,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 176 proven. 1280 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-03 02:31:23,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:31:24,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 236 proven. 1220 refuted. 0 times theorem prover too weak. 3814 trivial. 0 not checked. [2022-11-03 02:31:24,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:31:24,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097224059] [2022-11-03 02:31:24,491 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:31:24,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670135165] [2022-11-03 02:31:24,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670135165] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:31:24,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1770422956] [2022-11-03 02:31:24,494 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:31:24,494 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:31:24,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:31:24,495 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:31:24,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:31:29,651 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:31:29,657 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:31:29,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:31:44,907 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182923#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:31:44,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:31:44,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:31:44,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 25 [2022-11-03 02:31:44,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689363897] [2022-11-03 02:31:44,908 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:31:44,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 02:31:44,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:31:44,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 02:31:44,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1990, Unknown=1, NotChecked=0, Total=2162 [2022-11-03 02:31:44,911 INFO L87 Difference]: Start difference. First operand 7664 states and 10096 transitions. Second operand has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-03 02:32:09,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:32:09,695 INFO L93 Difference]: Finished difference Result 30169 states and 40583 transitions. [2022-11-03 02:32:09,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-11-03 02:32:09,695 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) Word has length 370 [2022-11-03 02:32:09,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:32:09,767 INFO L225 Difference]: With dead ends: 30169 [2022-11-03 02:32:09,768 INFO L226 Difference]: Without dead ends: 28330 [2022-11-03 02:32:09,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 1054 SyntacticMatches, 9 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6983 ImplicationChecksByTransitivity, 23.3s TimeCoverageRelationStatistics Valid=1797, Invalid=19958, Unknown=1, NotChecked=0, Total=21756 [2022-11-03 02:32:09,782 INFO L413 NwaCegarLoop]: 656 mSDtfsCounter, 786 mSDsluCounter, 4279 mSDsCounter, 0 mSdLazyCounter, 6384 mSolverCounterSat, 457 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 795 SdHoareTripleChecker+Valid, 4919 SdHoareTripleChecker+Invalid, 6841 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 457 IncrementalHoareTripleChecker+Valid, 6384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-11-03 02:32:09,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [795 Valid, 4919 Invalid, 6841 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [457 Valid, 6384 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-11-03 02:32:09,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28330 states. [2022-11-03 02:32:16,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28330 to 19357. [2022-11-03 02:32:16,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19357 states, 14537 states have (on average 1.1396436678819564) internal successors, (16567), 14653 states have internal predecessors, (16567), 4726 states have call successors, (4726), 94 states have call predecessors, (4726), 93 states have return successors, (4725), 4609 states have call predecessors, (4725), 4725 states have call successors, (4725) [2022-11-03 02:32:16,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19357 states to 19357 states and 26018 transitions. [2022-11-03 02:32:16,580 INFO L78 Accepts]: Start accepts. Automaton has 19357 states and 26018 transitions. Word has length 370 [2022-11-03 02:32:16,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:32:16,581 INFO L495 AbstractCegarLoop]: Abstraction has 19357 states and 26018 transitions. [2022-11-03 02:32:16,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 7.36) internal successors, (184), 25 states have internal predecessors, (184), 25 states have call successors, (57), 2 states have call predecessors, (57), 1 states have return successors, (56), 24 states have call predecessors, (56), 24 states have call successors, (56) [2022-11-03 02:32:16,581 INFO L276 IsEmpty]: Start isEmpty. Operand 19357 states and 26018 transitions. [2022-11-03 02:32:16,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-03 02:32:16,648 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:32:16,648 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:32:16,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-11-03 02:32:16,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:16,859 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:32:16,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:32:16,859 INFO L85 PathProgramCache]: Analyzing trace with hash -279568430, now seen corresponding path program 12 times [2022-11-03 02:32:16,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:32:16,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599853905] [2022-11-03 02:32:16,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:32:16,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:32:16,888 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:32:16,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [37891335] [2022-11-03 02:32:16,889 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 02:32:16,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:32:16,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:32:16,890 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:32:16,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-03 02:32:17,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 02:32:17,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:32:17,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 737 conjuncts, 57 conjunts are in the unsatisfiable core [2022-11-03 02:32:17,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:32:35,996 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 2481 proven. 532 refuted. 20 times theorem prover too weak. 2237 trivial. 0 not checked. [2022-11-03 02:32:35,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:32:38,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 791 proven. 532 refuted. 0 times theorem prover too weak. 3947 trivial. 0 not checked. [2022-11-03 02:32:38,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:32:38,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599853905] [2022-11-03 02:32:38,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:32:38,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37891335] [2022-11-03 02:32:38,275 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37891335] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:32:38,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561891860] [2022-11-03 02:32:38,277 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:32:38,278 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:32:38,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:32:38,278 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:32:38,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:32:40,814 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 47 for LOIs [2022-11-03 02:32:40,884 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:32:40,926 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:32:48,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '259685#(and (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:32:48,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:32:48,068 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:32:48,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19] total 33 [2022-11-03 02:32:48,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753567100] [2022-11-03 02:32:48,069 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:32:48,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-03 02:32:48,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:32:48,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-03 02:32:48,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2394, Unknown=4, NotChecked=0, Total=2652 [2022-11-03 02:32:48,073 INFO L87 Difference]: Start difference. First operand 19357 states and 26018 transitions. Second operand has 33 states, 32 states have (on average 6.34375) internal successors, (203), 30 states have internal predecessors, (203), 28 states have call successors, (68), 3 states have call predecessors, (68), 3 states have return successors, (67), 30 states have call predecessors, (67), 28 states have call successors, (67) [2022-11-03 02:32:50,182 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:32:52,187 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:32:55,822 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:32:57,681 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:09,798 WARN L234 SmtUtils]: Spent 8.00s on a formula simplification. DAG size of input: 28 DAG size of output: 25 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:33:16,388 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:17,434 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:25,604 WARN L234 SmtUtils]: Spent 5.99s on a formula simplification. DAG size of input: 30 DAG size of output: 27 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:33:28,209 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:31,133 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:35,739 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:37,744 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:40,638 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:42,990 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:45,092 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.76s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:47,110 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:49,116 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:51,041 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:33:54,702 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:01,788 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:15,740 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:18,382 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:20,386 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:25,141 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:43,783 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:46,964 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:34:59,191 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.04s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:02,974 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:06,584 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:15,807 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:36,004 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:38,011 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:39,310 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:41,321 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:44,279 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:49,849 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:52,702 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.68s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-03 02:35:59,830 WARN L234 SmtUtils]: Spent 5.36s on a formula simplification. DAG size of input: 32 DAG size of output: 26 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 02:36:00,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:36:00,148 INFO L93 Difference]: Finished difference Result 34144 states and 45652 transitions. [2022-11-03 02:36:00,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-11-03 02:36:00,149 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 6.34375) internal successors, (203), 30 states have internal predecessors, (203), 28 states have call successors, (68), 3 states have call predecessors, (68), 3 states have return successors, (67), 30 states have call predecessors, (67), 28 states have call successors, (67) Word has length 370 [2022-11-03 02:36:00,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:36:00,245 INFO L225 Difference]: With dead ends: 34144 [2022-11-03 02:36:00,245 INFO L226 Difference]: Without dead ends: 31215 [2022-11-03 02:36:00,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1245 GetRequests, 1090 SyntacticMatches, 5 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8297 ImplicationChecksByTransitivity, 89.9s TimeCoverageRelationStatistics Valid=2279, Invalid=20663, Unknown=10, NotChecked=0, Total=22952 [2022-11-03 02:36:00,266 INFO L413 NwaCegarLoop]: 571 mSDtfsCounter, 764 mSDsluCounter, 5322 mSDsCounter, 0 mSdLazyCounter, 4047 mSolverCounterSat, 259 mSolverCounterUnsat, 21 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 106.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 771 SdHoareTripleChecker+Valid, 5874 SdHoareTripleChecker+Invalid, 5544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 259 IncrementalHoareTripleChecker+Valid, 4047 IncrementalHoareTripleChecker+Invalid, 21 IncrementalHoareTripleChecker+Unknown, 1217 IncrementalHoareTripleChecker+Unchecked, 107.8s IncrementalHoareTripleChecker+Time [2022-11-03 02:36:00,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [771 Valid, 5874 Invalid, 5544 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [259 Valid, 4047 Invalid, 21 Unknown, 1217 Unchecked, 107.8s Time] [2022-11-03 02:36:00,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31215 states. [2022-11-03 02:36:10,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31215 to 25778. [2022-11-03 02:36:10,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25778 states, 19369 states have (on average 1.1336672001652124) internal successors, (21958), 19536 states have internal predecessors, (21958), 6232 states have call successors, (6232), 177 states have call predecessors, (6232), 176 states have return successors, (6231), 6064 states have call predecessors, (6231), 6231 states have call successors, (6231) [2022-11-03 02:36:11,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25778 states to 25778 states and 34421 transitions. [2022-11-03 02:36:11,036 INFO L78 Accepts]: Start accepts. Automaton has 25778 states and 34421 transitions. Word has length 370 [2022-11-03 02:36:11,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:36:11,036 INFO L495 AbstractCegarLoop]: Abstraction has 25778 states and 34421 transitions. [2022-11-03 02:36:11,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 6.34375) internal successors, (203), 30 states have internal predecessors, (203), 28 states have call successors, (68), 3 states have call predecessors, (68), 3 states have return successors, (67), 30 states have call predecessors, (67), 28 states have call successors, (67) [2022-11-03 02:36:11,036 INFO L276 IsEmpty]: Start isEmpty. Operand 25778 states and 34421 transitions. [2022-11-03 02:36:11,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-11-03 02:36:11,108 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:36:11,109 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 20, 19, 19, 19, 17, 16, 16, 16, 11, 10, 9, 9, 9, 9, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:36:11,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-03 02:36:11,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-03 02:36:11,322 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:36:11,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:36:11,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1300908078, now seen corresponding path program 13 times [2022-11-03 02:36:11,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:36:11,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532849148] [2022-11-03 02:36:11,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:36:11,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:36:11,339 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 02:36:11,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [635278864] [2022-11-03 02:36:11,339 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 02:36:11,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:36:11,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:36:11,341 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:36:11,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_272bd328-2b3d-4bd8-80c7-03c47f2edb81/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-03 02:36:11,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:36:11,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-03 02:36:11,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:36:13,328 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 5130 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-03 02:36:13,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:36:16,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5270 backedges. 138 proven. 1346 refuted. 0 times theorem prover too weak. 3786 trivial. 0 not checked. [2022-11-03 02:36:16,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:36:16,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532849148] [2022-11-03 02:36:16,850 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 02:36:16,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635278864] [2022-11-03 02:36:16,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635278864] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:36:16,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698834635] [2022-11-03 02:36:16,852 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-03 02:36:16,852 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:36:16,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:36:16,853 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:36:16,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:36:21,790 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2022-11-03 02:36:21,799 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 97 for LOIs [2022-11-03 02:36:21,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:36:30,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '351991#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= 1 ~counter~0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 104) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-03 02:36:30,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 02:36:30,118 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 02:36:30,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48] total 94 [2022-11-03 02:36:30,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371027843] [2022-11-03 02:36:30,118 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 02:36:30,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2022-11-03 02:36:30,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:36:30,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2022-11-03 02:36:30,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4733, Invalid=8607, Unknown=0, NotChecked=0, Total=13340 [2022-11-03 02:36:30,122 INFO L87 Difference]: Start difference. First operand 25778 states and 34421 transitions. Second operand has 94 states, 94 states have (on average 4.425531914893617) internal successors, (416), 94 states have internal predecessors, (416), 91 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 90 states have call predecessors, (92), 90 states have call successors, (92) [2022-11-03 02:37:22,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:37:22,223 INFO L93 Difference]: Finished difference Result 100153 states and 150518 transitions. [2022-11-03 02:37:22,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2022-11-03 02:37:22,224 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 4.425531914893617) internal successors, (416), 94 states have internal predecessors, (416), 91 states have call successors, (93), 47 states have call predecessors, (93), 46 states have return successors, (92), 90 states have call predecessors, (92), 90 states have call successors, (92) Word has length 370 [2022-11-03 02:37:22,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:37:22,547 INFO L225 Difference]: With dead ends: 100153 [2022-11-03 02:37:22,548 INFO L226 Difference]: Without dead ends: 99914 [2022-11-03 02:37:22,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1196 GetRequests, 994 SyntacticMatches, 0 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9821 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=12785, Invalid=28627, Unknown=0, NotChecked=0, Total=41412 [2022-11-03 02:37:22,938 INFO L413 NwaCegarLoop]: 288 mSDtfsCounter, 4402 mSDsluCounter, 1725 mSDsCounter, 0 mSdLazyCounter, 1717 mSolverCounterSat, 3053 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4402 SdHoareTripleChecker+Valid, 2011 SdHoareTripleChecker+Invalid, 4770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3053 IncrementalHoareTripleChecker+Valid, 1717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-11-03 02:37:22,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4402 Valid, 2011 Invalid, 4770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3053 Valid, 1717 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2022-11-03 02:37:23,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99914 states.