./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/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_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/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_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/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 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 --- 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 03:40:31,279 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:40:31,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:40:31,308 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:40:31,309 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:40:31,310 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:40:31,311 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:40:31,313 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:40:31,315 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:40:31,316 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:40:31,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:40:31,328 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:40:31,328 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:40:31,334 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:40:31,335 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:40:31,339 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:40:31,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:40:31,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:40:31,344 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:40:31,346 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:40:31,347 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:40:31,349 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:40:31,350 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:40:31,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:40:31,354 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:40:31,355 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:40:31,355 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:40:31,356 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:40:31,357 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:40:31,358 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:40:31,358 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:40:31,359 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:40:31,360 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:40:31,361 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:40:31,362 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:40:31,362 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:40:31,363 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:40:31,363 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:40:31,363 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:40:31,364 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:40:31,365 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:40:31,366 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 03:40:31,388 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:40:31,389 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:40:31,389 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:40:31,389 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:40:31,390 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:40:31,390 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:40:31,391 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:40:31,391 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:40:31,391 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:40:31,391 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:40:31,392 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:40:31,392 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:40:31,392 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:40:31,393 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:40:31,393 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:40:31,393 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:40:31,393 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:40:31,394 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:40:31,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:40:31,395 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:40:31,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:40:31,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:40:31,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:40:31,396 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 03:40:31,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:40:31,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 03:40:31,397 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:40:31,397 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 03:40:31,397 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:40:31,397 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 03:40:31,398 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:40:31,398 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:40:31,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:40:31,398 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:40:31,399 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:40:31,399 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:40:31,399 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 03:40:31,399 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:40:31,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:40:31,400 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 03:40:31,400 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:40:31,401 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_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 99e5cccea54789cc7c8b01ece41ae38ca7afc8c38f73e2884988b8ff4c6bfc25 [2022-11-03 03:40:31,664 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:40:31,697 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:40:31,700 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:40:31,702 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:40:31,703 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:40:31,705 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2022-11-03 03:40:31,774 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/data/9484005a1/1739c8b722374d3f9881f8920f87270c/FLAGfb7b3f83c [2022-11-03 03:40:32,300 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:40:32,301 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c [2022-11-03 03:40:32,307 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/data/9484005a1/1739c8b722374d3f9881f8920f87270c/FLAGfb7b3f83c [2022-11-03 03:40:32,660 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/data/9484005a1/1739c8b722374d3f9881f8920f87270c [2022-11-03 03:40:32,662 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:40:32,664 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:40:32,666 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:40:32,666 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:40:32,670 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:40:32,671 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:32,672 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@bfbed53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32, skipping insertion in model container [2022-11-03 03:40:32,672 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:32,679 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:40:32,692 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:40:32,907 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_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2022-11-03 03:40:32,932 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:40:32,942 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:40:32,956 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_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound20.c[458,471] [2022-11-03 03:40:32,978 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:40:32,993 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:40:32,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32 WrapperNode [2022-11-03 03:40:32,994 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:40:32,995 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:40:32,996 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:40:32,996 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:40:33,004 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,011 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,032 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2022-11-03 03:40:33,033 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:40:33,034 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:40:33,034 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:40:33,035 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:40:33,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,055 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,055 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,061 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,068 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,071 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,072 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,074 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:40:33,076 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:40:33,077 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:40:33,077 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:40:33,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (1/1) ... [2022-11-03 03:40:33,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:40:33,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:40:33,110 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:40:33,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:40:33,171 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 03:40:33,172 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 03:40:33,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:40:33,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:40:33,172 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-03 03:40:33,172 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-03 03:40:33,246 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:40:33,248 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:40:33,457 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:40:33,470 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:40:33,470 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-03 03:40:33,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:40:33 BoogieIcfgContainer [2022-11-03 03:40:33,473 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:40:33,476 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:40:33,476 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:40:33,479 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:40:33,480 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:40:32" (1/3) ... [2022-11-03 03:40:33,480 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@483fad6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:40:33, skipping insertion in model container [2022-11-03 03:40:33,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:40:32" (2/3) ... [2022-11-03 03:40:33,481 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@483fad6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:40:33, skipping insertion in model container [2022-11-03 03:40:33,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:40:33" (3/3) ... [2022-11-03 03:40:33,483 INFO L112 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound20.c [2022-11-03 03:40:33,502 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:40:33,502 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 03:40:33,553 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:40:33,560 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;@169dda8b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:40:33,561 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 03:40:33,565 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:40:33,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-03 03:40:33,575 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:40:33,576 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-03 03:40:33,577 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:40:33,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:40:33,586 INFO L85 PathProgramCache]: Analyzing trace with hash -2099432067, now seen corresponding path program 1 times [2022-11-03 03:40:33,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:40:33,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672006955] [2022-11-03 03:40:33,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:33,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:40:33,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:33,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:40:33,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672006955] [2022-11-03 03:40:33,733 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-03 03:40:33,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855469094] [2022-11-03 03:40:33,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:33,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:33,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:40:33,737 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:40:33,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 03:40:33,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:33,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-03 03:40:33,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:40:33,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:40:33,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:40:33,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855469094] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:40:33,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:40:33,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-03 03:40:33,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817559449] [2022-11-03 03:40:33,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:40:33,889 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-03 03:40:33,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:40:33,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-03 03:40:33,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 03:40:33,920 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:33,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:40:33,944 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2022-11-03 03:40:33,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-03 03:40:33,947 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-03 03:40:33,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:40:33,954 INFO L225 Difference]: With dead ends: 29 [2022-11-03 03:40:33,954 INFO L226 Difference]: Without dead ends: 13 [2022-11-03 03:40:33,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-03 03:40:33,961 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:40:33,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:40:33,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-11-03 03:40:33,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-11-03 03:40:33,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:40:33,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-11-03 03:40:34,000 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-11-03 03:40:34,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:40:34,000 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-11-03 03:40:34,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:34,001 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-11-03 03:40:34,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 03:40:34,002 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:40:34,003 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:40:34,038 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-03 03:40:34,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:34,229 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:40:34,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:40:34,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1058308380, now seen corresponding path program 1 times [2022-11-03 03:40:34,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:40:34,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283070447] [2022-11-03 03:40:34,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:34,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:40:34,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:34,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:40:34,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283070447] [2022-11-03 03:40:34,269 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-03 03:40:34,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210627936] [2022-11-03 03:40:34,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:34,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:34,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:40:34,271 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:40:34,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 03:40:34,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:34,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:40:34,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:40:34,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:40:34,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:40:34,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210627936] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:40:34,410 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:40:34,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:40:34,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966798413] [2022-11-03 03:40:34,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:40:34,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:40:34,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:40:34,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:40:34,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:40:34,413 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:34,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:40:34,433 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2022-11-03 03:40:34,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:40:34,434 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 03:40:34,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:40:34,434 INFO L225 Difference]: With dead ends: 23 [2022-11-03 03:40:34,435 INFO L226 Difference]: Without dead ends: 15 [2022-11-03 03:40:34,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:40:34,437 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:40:34,438 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:40:34,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-03 03:40:34,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-03 03:40:34,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:40:34,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-03 03:40:34,444 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2022-11-03 03:40:34,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:40:34,444 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-03 03:40:34,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:34,445 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-03 03:40:34,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-03 03:40:34,446 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:40:34,446 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:40:34,481 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:40:34,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:34,664 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:40:34,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:40:34,665 INFO L85 PathProgramCache]: Analyzing trace with hash -1056520920, now seen corresponding path program 1 times [2022-11-03 03:40:34,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:40:34,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651855226] [2022-11-03 03:40:34,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:34,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:40:34,679 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:40:34,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [813450684] [2022-11-03 03:40:34,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:34,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:34,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:40:34,681 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:40:34,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 03:40:34,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:34,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-03 03:40:34,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:40:34,840 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:40:34,840 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:40:34,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:40:34,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651855226] [2022-11-03 03:40:34,841 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:40:34,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813450684] [2022-11-03 03:40:34,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813450684] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:40:34,842 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:40:34,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:40:34,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697404965] [2022-11-03 03:40:34,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:40:34,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:40:34,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:40:34,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:40:34,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 03:40:34,844 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:34,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:40:34,916 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-03 03:40:34,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:40:34,917 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2022-11-03 03:40:34,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:40:34,918 INFO L225 Difference]: With dead ends: 25 [2022-11-03 03:40:34,918 INFO L226 Difference]: Without dead ends: 21 [2022-11-03 03:40:34,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:40:34,920 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:40:34,921 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 41 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:40:34,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-03 03:40:34,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-03 03:40:34,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:40:34,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2022-11-03 03:40:34,929 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2022-11-03 03:40:34,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:40:34,929 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2022-11-03 03:40:34,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-03 03:40:34,930 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2022-11-03 03:40:34,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 03:40:34,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:40:34,931 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:40:34,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:40:35,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-03 03:40:35,132 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:40:35,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:40:35,133 INFO L85 PathProgramCache]: Analyzing trace with hash -640052534, now seen corresponding path program 1 times [2022-11-03 03:40:35,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:40:35,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147709320] [2022-11-03 03:40:35,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:35,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:40:35,147 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:40:35,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [333502382] [2022-11-03 03:40:35,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:40:35,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:40:35,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:40:35,150 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:40:35,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 03:40:35,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:40:35,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 03:40:35,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:40:35,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:40:35,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:40:35,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:40:35,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:40:35,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147709320] [2022-11-03 03:40:35,313 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:40:35,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333502382] [2022-11-03 03:40:35,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333502382] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:40:35,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1976521671] [2022-11-03 03:40:35,348 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:40:35,349 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:40:35,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:40:35,366 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:40:35,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:40:36,457 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-03 03:40:36,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:07,741 WARN L234 SmtUtils]: Spent 31.05s on a formula simplification. DAG size of input: 89 DAG size of output: 69 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-03 03:41:15,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(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 03:41:15,010 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:15,011 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:41:15,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2022-11-03 03:41:15,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920421364] [2022-11-03 03:41:15,011 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:15,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 03:41:15,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:15,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 03:41:15,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=197, Unknown=1, NotChecked=0, Total=240 [2022-11-03 03:41:15,013 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:41:15,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:15,132 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2022-11-03 03:41:15,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 03:41:15,133 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2022-11-03 03:41:15,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:15,134 INFO L225 Difference]: With dead ends: 55 [2022-11-03 03:41:15,134 INFO L226 Difference]: Without dead ends: 47 [2022-11-03 03:41:15,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=62, Invalid=279, Unknown=1, NotChecked=0, Total=342 [2022-11-03 03:41:15,136 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 35 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:15,137 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 86 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:15,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-11-03 03:41:15,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 43. [2022-11-03 03:41:15,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.25) internal successors, (35), 31 states have internal predecessors, (35), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 03:41:15,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2022-11-03 03:41:15,148 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 15 [2022-11-03 03:41:15,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:15,149 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2022-11-03 03:41:15,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:41:15,149 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2022-11-03 03:41:15,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-03 03:41:15,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:15,150 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:41:15,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:15,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:15,364 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:15,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:15,365 INFO L85 PathProgramCache]: Analyzing trace with hash -638265074, now seen corresponding path program 1 times [2022-11-03 03:41:15,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:15,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356372894] [2022-11-03 03:41:15,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:15,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:15,376 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:15,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [339259131] [2022-11-03 03:41:15,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:15,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:15,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:15,378 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:15,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 03:41:15,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:41:15,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 03:41:15,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:15,534 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:41:15,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:15,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-03 03:41:15,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:15,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356372894] [2022-11-03 03:41:15,610 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:15,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339259131] [2022-11-03 03:41:15,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339259131] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:15,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:15,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 03:41:15,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047813182] [2022-11-03 03:41:15,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:41:15,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 03:41:15,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:15,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 03:41:15,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:41:15,614 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:41:15,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:15,674 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2022-11-03 03:41:15,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:41:15,674 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-03 03:41:15,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:15,678 INFO L225 Difference]: With dead ends: 57 [2022-11-03 03:41:15,679 INFO L226 Difference]: Without dead ends: 46 [2022-11-03 03:41:15,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:41:15,682 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:15,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 30 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:41:15,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-03 03:41:15,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 40. [2022-11-03 03:41:15,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 30 states have internal predecessors, (34), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 03:41:15,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2022-11-03 03:41:15,694 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 15 [2022-11-03 03:41:15,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:15,695 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2022-11-03 03:41:15,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 03:41:15,695 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2022-11-03 03:41:15,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-03 03:41:15,696 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:15,696 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-03 03:41:15,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-03 03:41:15,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:15,917 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:15,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:15,917 INFO L85 PathProgramCache]: Analyzing trace with hash -186597301, now seen corresponding path program 1 times [2022-11-03 03:41:15,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:15,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014118381] [2022-11-03 03:41:15,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:15,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:15,927 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:15,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1398688205] [2022-11-03 03:41:15,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:15,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:15,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:15,929 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:15,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 03:41:15,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:41:15,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 03:41:15,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:16,131 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 03:41:16,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:16,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:16,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014118381] [2022-11-03 03:41:16,268 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:16,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398688205] [2022-11-03 03:41:16,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398688205] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:16,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083480904] [2022-11-03 03:41:16,271 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:16,271 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:16,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:16,272 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:16,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:16,745 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:16,837 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:17,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '842#(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 03:41:17,772 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:17,773 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:17,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-11-03 03:41:17,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925573142] [2022-11-03 03:41:17,773 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:17,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 03:41:17,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:17,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 03:41:17,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2022-11-03 03:41:17,774 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:41:17,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:17,873 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2022-11-03 03:41:17,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:41:17,874 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-11-03 03:41:17,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:17,875 INFO L225 Difference]: With dead ends: 45 [2022-11-03 03:41:17,875 INFO L226 Difference]: Without dead ends: 40 [2022-11-03 03:41:17,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:41:17,877 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 2 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:17,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 67 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:17,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-03 03:41:17,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-03 03:41:17,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 03:41:17,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-11-03 03:41:17,887 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 21 [2022-11-03 03:41:17,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:17,888 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-11-03 03:41:17,888 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-03 03:41:17,888 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-11-03 03:41:17,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-03 03:41:17,889 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:17,889 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1] [2022-11-03 03:41:17,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:18,104 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:18,105 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:18,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:18,105 INFO L85 PathProgramCache]: Analyzing trace with hash -648869455, now seen corresponding path program 2 times [2022-11-03 03:41:18,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:18,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653476797] [2022-11-03 03:41:18,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:18,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:18,115 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:18,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [551290968] [2022-11-03 03:41:18,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:41:18,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:18,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:18,126 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:18,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 03:41:18,195 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:41:18,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:18,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-03 03:41:18,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:18,334 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:41:18,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:18,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:18,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653476797] [2022-11-03 03:41:18,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:18,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551290968] [2022-11-03 03:41:18,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551290968] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:18,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829995870] [2022-11-03 03:41:18,662 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:18,662 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:18,663 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:18,663 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:18,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:19,108 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:19,180 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:25,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1109#(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 03:41:25,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:25,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:25,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2022-11-03 03:41:25,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331729749] [2022-11-03 03:41:25,006 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:25,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-03 03:41:25,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:25,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-03 03:41:25,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2022-11-03 03:41:25,007 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:41:25,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:25,144 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2022-11-03 03:41:25,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:41:25,145 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 29 [2022-11-03 03:41:25,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:25,145 INFO L225 Difference]: With dead ends: 45 [2022-11-03 03:41:25,146 INFO L226 Difference]: Without dead ends: 40 [2022-11-03 03:41:25,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2022-11-03 03:41:25,147 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 2 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:25,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 94 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:25,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-03 03:41:25,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-11-03 03:41:25,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 03:41:25,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-11-03 03:41:25,163 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2022-11-03 03:41:25,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:25,164 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-11-03 03:41:25,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 03:41:25,164 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-11-03 03:41:25,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-03 03:41:25,165 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:25,165 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1] [2022-11-03 03:41:25,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:25,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:25,366 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:25,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:25,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1028616937, now seen corresponding path program 3 times [2022-11-03 03:41:25,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:25,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599494295] [2022-11-03 03:41:25,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:25,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:25,376 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:25,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [80937477] [2022-11-03 03:41:25,390 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:41:25,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:25,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:25,398 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:25,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:41:25,556 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:41:25,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:25,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-03 03:41:25,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:25,727 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 03:41:25,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:25,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:25,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599494295] [2022-11-03 03:41:25,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:25,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80937477] [2022-11-03 03:41:25,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80937477] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:25,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104755567] [2022-11-03 03:41:25,954 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:25,955 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:25,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:25,955 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:25,955 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:26,340 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:26,417 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:28,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1401#(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 03:41:28,443 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:28,444 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:28,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2022-11-03 03:41:28,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117653680] [2022-11-03 03:41:28,444 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:28,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-03 03:41:28,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:28,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-03 03:41:28,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2022-11-03 03:41:28,449 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 03:41:28,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:28,587 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2022-11-03 03:41:28,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-03 03:41:28,587 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 37 [2022-11-03 03:41:28,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:28,588 INFO L225 Difference]: With dead ends: 47 [2022-11-03 03:41:28,588 INFO L226 Difference]: Without dead ends: 42 [2022-11-03 03:41:28,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:41:28,589 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 2 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:28,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 125 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:28,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-11-03 03:41:28,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-11-03 03:41:28,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 03:41:28,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2022-11-03 03:41:28,599 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2022-11-03 03:41:28,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:28,599 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2022-11-03 03:41:28,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-03 03:41:28,600 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2022-11-03 03:41:28,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-03 03:41:28,601 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:28,601 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2022-11-03 03:41:28,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:28,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-03 03:41:28,806 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:28,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:28,806 INFO L85 PathProgramCache]: Analyzing trace with hash 126888572, now seen corresponding path program 2 times [2022-11-03 03:41:28,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:28,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40591174] [2022-11-03 03:41:28,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:28,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:28,816 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:28,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1065003406] [2022-11-03 03:41:28,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:41:28,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:28,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:28,818 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:28,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 03:41:28,921 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-03 03:41:28,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:28,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-03 03:41:28,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:28,994 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:41:28,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:29,112 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 32 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 03:41:29,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:29,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40591174] [2022-11-03 03:41:29,113 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:29,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065003406] [2022-11-03 03:41:29,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065003406] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:41:29,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [645156507] [2022-11-03 03:41:29,115 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:29,115 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:29,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:29,116 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:29,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:29,493 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-03 03:41:29,565 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:30,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1779#(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 03:41:30,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:30,167 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:41:30,167 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2022-11-03 03:41:30,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416513019] [2022-11-03 03:41:30,167 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:30,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 03:41:30,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:30,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 03:41:30,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-03 03:41:30,169 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 03:41:30,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:30,463 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2022-11-03 03:41:30,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 03:41:30,463 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 39 [2022-11-03 03:41:30,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:30,464 INFO L225 Difference]: With dead ends: 118 [2022-11-03 03:41:30,465 INFO L226 Difference]: Without dead ends: 113 [2022-11-03 03:41:30,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2022-11-03 03:41:30,466 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 100 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:30,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 126 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:30,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-03 03:41:30,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 88. [2022-11-03 03:41:30,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.106060606060606) internal successors, (73), 66 states have internal predecessors, (73), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:41:30,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 94 transitions. [2022-11-03 03:41:30,482 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 94 transitions. Word has length 39 [2022-11-03 03:41:30,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:30,483 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 94 transitions. [2022-11-03 03:41:30,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 14 states have internal predecessors, (48), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 03:41:30,483 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 94 transitions. [2022-11-03 03:41:30,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-03 03:41:30,484 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:30,484 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1] [2022-11-03 03:41:30,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:30,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:30,708 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:30,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:30,709 INFO L85 PathProgramCache]: Analyzing trace with hash 387926653, now seen corresponding path program 4 times [2022-11-03 03:41:30,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:30,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051924105] [2022-11-03 03:41:30,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:30,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:30,718 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:30,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [857749894] [2022-11-03 03:41:30,718 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:41:30,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:30,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:30,720 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:30,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:41:30,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:41:30,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-03 03:41:30,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:30,978 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 03:41:30,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:31,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:31,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051924105] [2022-11-03 03:41:31,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:31,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857749894] [2022-11-03 03:41:31,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857749894] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:31,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1716521338] [2022-11-03 03:41:31,140 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:31,140 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:31,140 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:31,140 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:31,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:31,527 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:31,594 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:33,967 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2276#(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 03:41:33,967 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:33,967 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:33,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2022-11-03 03:41:33,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470695190] [2022-11-03 03:41:33,968 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:33,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-03 03:41:33,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:33,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-03 03:41:33,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2022-11-03 03:41:33,970 INFO L87 Difference]: Start difference. First operand 88 states and 94 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 03:41:34,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:34,162 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2022-11-03 03:41:34,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-03 03:41:34,162 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 45 [2022-11-03 03:41:34,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:34,164 INFO L225 Difference]: With dead ends: 93 [2022-11-03 03:41:34,164 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:41:34,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=73, Invalid=479, Unknown=0, NotChecked=0, Total=552 [2022-11-03 03:41:34,165 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:34,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 160 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:41:34,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:41:34,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-03 03:41:34,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 66 states have internal predecessors, (72), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:41:34,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 93 transitions. [2022-11-03 03:41:34,181 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 93 transitions. Word has length 45 [2022-11-03 03:41:34,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:34,182 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 93 transitions. [2022-11-03 03:41:34,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 9 states have internal predecessors, (22), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 03:41:34,182 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 93 transitions. [2022-11-03 03:41:34,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-03 03:41:34,183 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:34,183 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1] [2022-11-03 03:41:34,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:34,408 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 03:41:34,408 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:34,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:34,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1228586525, now seen corresponding path program 5 times [2022-11-03 03:41:34,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:34,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989150605] [2022-11-03 03:41:34,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:34,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:34,418 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:34,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [491058739] [2022-11-03 03:41:34,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:41:34,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:34,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:34,421 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:34,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:41:34,801 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-03 03:41:34,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:34,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-03 03:41:34,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:35,008 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-11-03 03:41:35,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:35,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:35,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989150605] [2022-11-03 03:41:35,160 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:35,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491058739] [2022-11-03 03:41:35,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491058739] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:35,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512977148] [2022-11-03 03:41:35,162 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:35,162 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:35,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:35,163 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:35,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:35,507 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:35,574 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:36,502 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2750#(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 03:41:36,503 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:36,503 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:36,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-11-03 03:41:36,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463391263] [2022-11-03 03:41:36,503 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:36,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 03:41:36,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:36,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 03:41:36,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-11-03 03:41:36,505 INFO L87 Difference]: Start difference. First operand 88 states and 93 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-03 03:41:36,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:36,749 INFO L93 Difference]: Finished difference Result 93 states and 97 transitions. [2022-11-03 03:41:36,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 03:41:36,750 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 53 [2022-11-03 03:41:36,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:36,751 INFO L225 Difference]: With dead ends: 93 [2022-11-03 03:41:36,751 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:41:36,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2022-11-03 03:41:36,752 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 2 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:36,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 199 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:41:36,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:41:36,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-03 03:41:36,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0757575757575757) internal successors, (71), 66 states have internal predecessors, (71), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:41:36,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2022-11-03 03:41:36,767 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 53 [2022-11-03 03:41:36,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:36,767 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2022-11-03 03:41:36,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-03 03:41:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2022-11-03 03:41:36,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-03 03:41:36,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:36,769 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1] [2022-11-03 03:41:36,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:36,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:36,976 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:36,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:36,977 INFO L85 PathProgramCache]: Analyzing trace with hash -70749367, now seen corresponding path program 6 times [2022-11-03 03:41:36,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:36,977 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562472340] [2022-11-03 03:41:36,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:36,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:36,986 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:36,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1648058230] [2022-11-03 03:41:36,986 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:41:36,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:36,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:36,988 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:36,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 03:41:37,550 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:41:37,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:37,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-03 03:41:37,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:37,780 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 14 proven. 84 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-11-03 03:41:37,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:37,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:37,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562472340] [2022-11-03 03:41:37,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:37,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648058230] [2022-11-03 03:41:37,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648058230] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:37,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626944579] [2022-11-03 03:41:37,952 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:37,953 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:37,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:37,953 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:37,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:38,308 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:38,394 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:39,311 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3249#(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 03:41:39,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:39,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:39,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2022-11-03 03:41:39,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55487373] [2022-11-03 03:41:39,312 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:39,312 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-03 03:41:39,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:39,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-03 03:41:39,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2022-11-03 03:41:39,313 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 03:41:39,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:39,594 INFO L93 Difference]: Finished difference Result 93 states and 96 transitions. [2022-11-03 03:41:39,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 03:41:39,595 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 61 [2022-11-03 03:41:39,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:39,596 INFO L225 Difference]: With dead ends: 93 [2022-11-03 03:41:39,596 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:41:39,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2022-11-03 03:41:39,598 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 2 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:39,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 242 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:41:39,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:41:39,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-03 03:41:39,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 66 states have internal predecessors, (70), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:41:39,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2022-11-03 03:41:39,611 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 61 [2022-11-03 03:41:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:39,612 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2022-11-03 03:41:39,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-03 03:41:39,612 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2022-11-03 03:41:39,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-03 03:41:39,613 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:39,613 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1] [2022-11-03 03:41:39,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:39,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-03 03:41:39,820 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:39,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:39,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1169236305, now seen corresponding path program 7 times [2022-11-03 03:41:39,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:39,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208800157] [2022-11-03 03:41:39,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:39,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:39,830 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:39,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1150275841] [2022-11-03 03:41:39,830 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:41:39,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:39,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:39,832 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:39,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 03:41:40,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:41:40,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-03 03:41:40,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:40,524 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 16 proven. 112 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-11-03 03:41:40,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:41:40,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:41:40,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208800157] [2022-11-03 03:41:40,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:41:40,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150275841] [2022-11-03 03:41:40,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150275841] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:41:40,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1229916688] [2022-11-03 03:41:40,690 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:41:40,690 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:41:40,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:41:40,690 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:41:40,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:41:41,023 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:41:41,087 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:41:42,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3773#(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 03:41:42,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:41:42,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:41:42,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-11-03 03:41:42,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900301085] [2022-11-03 03:41:42,019 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:41:42,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 03:41:42,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:41:42,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 03:41:42,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2022-11-03 03:41:42,021 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 03:41:42,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:41:42,311 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2022-11-03 03:41:42,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-03 03:41:42,312 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 69 [2022-11-03 03:41:42,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:41:42,313 INFO L225 Difference]: With dead ends: 93 [2022-11-03 03:41:42,313 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:41:42,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=82, Invalid=620, Unknown=0, NotChecked=0, Total=702 [2022-11-03 03:41:42,317 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 2 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:41:42,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 289 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:41:42,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:41:42,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-03 03:41:42,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:41:42,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-11-03 03:41:42,329 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 69 [2022-11-03 03:41:42,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:41:42,329 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-11-03 03:41:42,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 12 states have internal predecessors, (31), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-03 03:41:42,330 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-11-03 03:41:42,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-03 03:41:42,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:41:42,331 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1] [2022-11-03 03:41:42,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:41:42,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-03 03:41:42,538 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:41:42,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:41:42,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1082033173, now seen corresponding path program 8 times [2022-11-03 03:41:42,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:41:42,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797063142] [2022-11-03 03:41:42,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:41:42,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:41:42,548 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:41:42,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2125788013] [2022-11-03 03:41:42,548 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:41:42,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:41:42,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:41:42,550 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:41:42,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 03:41:42,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-03 03:41:42,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:41:42,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 51 conjunts are in the unsatisfiable core [2022-11-03 03:41:42,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:41:43,215 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 58 proven. 146 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2022-11-03 03:41:43,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:07,704 WARN L833 $PredicateComparison]: unable to prove that (or (not (= (mod (+ (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* (- 1) |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| (- 2))) 4) 0)) (forall ((|ULTIMATE.start_main_~k~0#1| Int)) (or (not (< |c_ULTIMATE.start_main_~c~0#1| |ULTIMATE.start_main_~k~0#1|)) (< (+ |c_ULTIMATE.start_main_~c~0#1| 1) |ULTIMATE.start_main_~k~0#1|) (= (+ |ULTIMATE.start_main_~k~0#1| (* |c_ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~k~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| 2) 1))))) is different from false [2022-11-03 03:42:07,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797063142] [2022-11-03 03:42:07,707 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125788013] [2022-11-03 03:42:07,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125788013] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641950860] [2022-11-03 03:42:07,709 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:07,709 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:07,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:07,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:07,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:08,053 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:08,119 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:09,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4329#(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 03:42:09,245 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:09,245 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:09,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-03 03:42:09,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610881615] [2022-11-03 03:42:09,245 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:09,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 03:42:09,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:09,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 03:42:09,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=883, Unknown=4, NotChecked=60, Total=1056 [2022-11-03 03:42:09,246 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 03:42:09,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:09,700 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2022-11-03 03:42:09,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 03:42:09,701 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 77 [2022-11-03 03:42:09,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:09,702 INFO L225 Difference]: With dead ends: 93 [2022-11-03 03:42:09,702 INFO L226 Difference]: Without dead ends: 88 [2022-11-03 03:42:09,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=132, Invalid=1058, Unknown=4, NotChecked=66, Total=1260 [2022-11-03 03:42:09,703 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 9 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:09,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 337 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 511 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:42:09,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-03 03:42:09,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-11-03 03:42:09,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 11 states have call successors, (11), 11 states have call predecessors, (11), 10 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:42:09,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-11-03 03:42:09,716 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 77 [2022-11-03 03:42:09,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:09,717 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-11-03 03:42:09,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 15 states have internal predecessors, (37), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 03:42:09,717 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-11-03 03:42:09,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-03 03:42:09,718 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:09,719 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1] [2022-11-03 03:42:09,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:09,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:09,929 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:09,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:09,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1451058043, now seen corresponding path program 9 times [2022-11-03 03:42:09,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:09,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855245113] [2022-11-03 03:42:09,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:09,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:09,939 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:09,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [101079841] [2022-11-03 03:42:09,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:42:09,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:09,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:09,942 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:09,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 03:42:11,144 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:42:11,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:11,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-03 03:42:11,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:11,503 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 20 proven. 180 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-11-03 03:42:11,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:12,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:12,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855245113] [2022-11-03 03:42:12,615 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:12,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101079841] [2022-11-03 03:42:12,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101079841] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:12,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [525444929] [2022-11-03 03:42:12,617 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:12,618 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:12,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:12,618 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:12,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:13,019 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:13,113 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:14,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5105#(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 03:42:14,495 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:14,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:14,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-11-03 03:42:14,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347751691] [2022-11-03 03:42:14,495 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:14,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-03 03:42:14,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:14,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-03 03:42:14,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1016, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:42:14,497 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:42:14,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:14,977 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2022-11-03 03:42:14,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-03 03:42:14,978 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 85 [2022-11-03 03:42:14,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:14,979 INFO L225 Difference]: With dead ends: 95 [2022-11-03 03:42:14,980 INFO L226 Difference]: Without dead ends: 90 [2022-11-03 03:42:14,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 212 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=185, Invalid=1147, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:42:14,981 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 2 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:14,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 395 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:42:14,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-03 03:42:14,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-11-03 03:42:14,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 12 states have call successors, (12), 11 states have call predecessors, (12), 10 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-03 03:42:14,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2022-11-03 03:42:14,997 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2022-11-03 03:42:14,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:14,998 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2022-11-03 03:42:14,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 11 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-03 03:42:14,998 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2022-11-03 03:42:15,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-03 03:42:15,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:15,000 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2022-11-03 03:42:15,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:15,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 03:42:15,208 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:15,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:15,209 INFO L85 PathProgramCache]: Analyzing trace with hash -612304928, now seen corresponding path program 3 times [2022-11-03 03:42:15,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:15,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050313869] [2022-11-03 03:42:15,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:15,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:15,225 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:15,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [593488651] [2022-11-03 03:42:15,227 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:42:15,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:15,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:15,229 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:15,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 03:42:16,141 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:42:16,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:16,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-03 03:42:16,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:16,345 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:42:16,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:16,643 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 200 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-11-03 03:42:16,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:16,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050313869] [2022-11-03 03:42:16,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:16,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593488651] [2022-11-03 03:42:16,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593488651] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 03:42:16,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527266886] [2022-11-03 03:42:16,645 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:16,645 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:16,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:16,646 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:16,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:16,972 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 51 for LOIs [2022-11-03 03:42:17,028 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:17,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5913#(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 03:42:17,793 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:17,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-03 03:42:17,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 24 [2022-11-03 03:42:17,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112081140] [2022-11-03 03:42:17,794 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:17,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 03:42:17,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:17,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 03:42:17,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2022-11-03 03:42:17,796 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 24 states, 24 states have (on average 4.125) internal successors, (99), 24 states have internal predecessors, (99), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-11-03 03:42:18,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:18,385 INFO L93 Difference]: Finished difference Result 218 states and 228 transitions. [2022-11-03 03:42:18,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-03 03:42:18,385 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), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) Word has length 87 [2022-11-03 03:42:18,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:18,387 INFO L225 Difference]: With dead ends: 218 [2022-11-03 03:42:18,387 INFO L226 Difference]: Without dead ends: 213 [2022-11-03 03:42:18,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 227 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=688, Invalid=1862, Unknown=0, NotChecked=0, Total=2550 [2022-11-03 03:42:18,389 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 270 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:18,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [270 Valid, 210 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:42:18,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-11-03 03:42:18,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 168. [2022-11-03 03:42:18,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:18,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 178 transitions. [2022-11-03 03:42:18,409 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 178 transitions. Word has length 87 [2022-11-03 03:42:18,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:18,410 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 178 transitions. [2022-11-03 03:42:18,410 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), 20 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 19 states have call predecessors, (20), 19 states have call successors, (20) [2022-11-03 03:42:18,410 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 178 transitions. [2022-11-03 03:42:18,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-11-03 03:42:18,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:18,412 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1] [2022-11-03 03:42:18,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-03 03:42:18,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-03 03:42:18,619 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:18,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:18,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1047624929, now seen corresponding path program 10 times [2022-11-03 03:42:18,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:18,619 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31053997] [2022-11-03 03:42:18,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:18,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:18,628 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:18,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1437426435] [2022-11-03 03:42:18,629 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:42:18,629 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:18,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:18,630 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:18,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 03:42:19,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:42:19,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-03 03:42:19,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:19,843 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 22 proven. 220 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-11-03 03:42:19,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:20,011 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:20,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31053997] [2022-11-03 03:42:20,011 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:20,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437426435] [2022-11-03 03:42:20,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437426435] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:20,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751112004] [2022-11-03 03:42:20,013 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:20,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:20,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:20,014 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:20,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:20,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:20,400 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:21,387 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6828#(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 03:42:21,387 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:21,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:21,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2022-11-03 03:42:21,388 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326093596] [2022-11-03 03:42:21,388 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:21,388 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 03:42:21,388 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:21,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 03:42:21,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2022-11-03 03:42:21,389 INFO L87 Difference]: Start difference. First operand 168 states and 178 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-03 03:42:21,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:21,853 INFO L93 Difference]: Finished difference Result 173 states and 182 transitions. [2022-11-03 03:42:21,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 03:42:21,854 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Word has length 93 [2022-11-03 03:42:21,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:21,855 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:21,856 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:21,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=91, Invalid=779, Unknown=0, NotChecked=0, Total=870 [2022-11-03 03:42:21,860 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 454 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:21,860 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 454 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:42:21,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:21,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:21,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0793650793650793) internal successors, (136), 126 states have internal predecessors, (136), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:21,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 177 transitions. [2022-11-03 03:42:21,878 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 177 transitions. Word has length 93 [2022-11-03 03:42:21,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:21,878 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 177 transitions. [2022-11-03 03:42:21,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-03 03:42:21,879 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 177 transitions. [2022-11-03 03:42:21,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-11-03 03:42:21,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:21,880 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1] [2022-11-03 03:42:21,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:22,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 03:42:22,081 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:22,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:22,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1266626489, now seen corresponding path program 11 times [2022-11-03 03:42:22,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:22,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932913963] [2022-11-03 03:42:22,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:22,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:22,091 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:22,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1131882024] [2022-11-03 03:42:22,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:42:22,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:22,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:22,093 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:22,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 03:42:22,664 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-03 03:42:22,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:22,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-03 03:42:22,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:23,032 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 24 proven. 264 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2022-11-03 03:42:23,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:23,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:23,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932913963] [2022-11-03 03:42:23,251 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:23,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131882024] [2022-11-03 03:42:23,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131882024] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:23,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570972049] [2022-11-03 03:42:23,253 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:23,253 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:23,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:23,253 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:23,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:23,572 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:23,639 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:26,685 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7672#(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 03:42:26,685 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:26,685 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:26,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2022-11-03 03:42:26,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329936273] [2022-11-03 03:42:26,686 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:26,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-03 03:42:26,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:26,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-03 03:42:26,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2022-11-03 03:42:26,688 INFO L87 Difference]: Start difference. First operand 168 states and 177 transitions. Second operand has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 03:42:27,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:27,333 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2022-11-03 03:42:27,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-03 03:42:27,334 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Word has length 101 [2022-11-03 03:42:27,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:27,336 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:27,336 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:27,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2022-11-03 03:42:27,338 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 2 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:27,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 517 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 03:42:27,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:27,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:27,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0714285714285714) internal successors, (135), 126 states have internal predecessors, (135), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:27,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 176 transitions. [2022-11-03 03:42:27,360 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 176 transitions. Word has length 101 [2022-11-03 03:42:27,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:27,361 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 176 transitions. [2022-11-03 03:42:27,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.6875) internal successors, (43), 16 states have internal predecessors, (43), 13 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-03 03:42:27,362 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 176 transitions. [2022-11-03 03:42:27,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-11-03 03:42:27,363 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:27,363 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1] [2022-11-03 03:42:27,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:27,570 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 03:42:27,571 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:27,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:27,571 INFO L85 PathProgramCache]: Analyzing trace with hash -288268883, now seen corresponding path program 12 times [2022-11-03 03:42:27,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:27,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791260422] [2022-11-03 03:42:27,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:27,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:27,589 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:27,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [744435910] [2022-11-03 03:42:27,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:42:27,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:27,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:27,591 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:27,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 03:42:29,190 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:42:29,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:29,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-03 03:42:29,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 26 proven. 312 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-11-03 03:42:29,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:29,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:29,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791260422] [2022-11-03 03:42:29,826 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:29,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744435910] [2022-11-03 03:42:29,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744435910] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:29,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1366011221] [2022-11-03 03:42:29,829 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:29,829 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:29,829 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:29,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:29,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:30,184 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:30,256 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:31,353 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8541#(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 03:42:31,353 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:31,353 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:31,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-03 03:42:31,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005109223] [2022-11-03 03:42:31,353 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:31,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 03:42:31,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:31,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 03:42:31,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2022-11-03 03:42:31,355 INFO L87 Difference]: Start difference. First operand 168 states and 176 transitions. Second operand has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-03 03:42:31,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:31,935 INFO L93 Difference]: Finished difference Result 173 states and 180 transitions. [2022-11-03 03:42:31,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-03 03:42:31,936 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 109 [2022-11-03 03:42:31,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:31,937 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:31,937 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:31,937 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 201 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2022-11-03 03:42:31,937 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 2 mSDsluCounter, 526 mSDsCounter, 0 mSdLazyCounter, 654 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 584 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:31,938 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 584 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 654 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 03:42:31,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:31,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:31,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0634920634920635) internal successors, (134), 126 states have internal predecessors, (134), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:31,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 175 transitions. [2022-11-03 03:42:31,956 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 175 transitions. Word has length 109 [2022-11-03 03:42:31,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:31,956 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 175 transitions. [2022-11-03 03:42:31,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 17 states have internal predecessors, (46), 14 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-11-03 03:42:31,957 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 175 transitions. [2022-11-03 03:42:31,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-03 03:42:31,958 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:31,958 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1] [2022-11-03 03:42:31,969 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-11-03 03:42:32,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:32,164 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:32,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:32,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1651956461, now seen corresponding path program 13 times [2022-11-03 03:42:32,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:32,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187743782] [2022-11-03 03:42:32,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:32,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:32,176 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:32,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2039750021] [2022-11-03 03:42:32,176 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:42:32,176 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:32,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:32,177 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:32,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-03 03:42:33,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:42:33,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-03 03:42:33,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:33,840 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 28 proven. 364 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2022-11-03 03:42:33,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:35,348 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:35,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187743782] [2022-11-03 03:42:35,348 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:35,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039750021] [2022-11-03 03:42:35,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039750021] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:35,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [486575682] [2022-11-03 03:42:35,350 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:35,350 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:35,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:35,351 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:35,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:35,730 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:35,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:41,413 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9735#(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 03:42:41,413 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:41,413 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:41,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-11-03 03:42:41,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274331196] [2022-11-03 03:42:41,413 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:41,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-03 03:42:41,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:41,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-03 03:42:41,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1524, Unknown=0, NotChecked=0, Total=1806 [2022-11-03 03:42:41,415 INFO L87 Difference]: Start difference. First operand 168 states and 175 transitions. Second operand has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-03 03:42:42,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:42,081 INFO L93 Difference]: Finished difference Result 173 states and 179 transitions. [2022-11-03 03:42:42,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-03 03:42:42,082 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 117 [2022-11-03 03:42:42,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:42,083 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:42,084 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:42,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 300 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=293, Invalid=1687, Unknown=0, NotChecked=0, Total=1980 [2022-11-03 03:42:42,085 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 2 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 655 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:42,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 655 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 03:42:42,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:42,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:42,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0555555555555556) internal successors, (133), 126 states have internal predecessors, (133), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:42,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 174 transitions. [2022-11-03 03:42:42,104 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 174 transitions. Word has length 117 [2022-11-03 03:42:42,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:42,105 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 174 transitions. [2022-11-03 03:42:42,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 18 states have internal predecessors, (49), 15 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-11-03 03:42:42,105 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 174 transitions. [2022-11-03 03:42:42,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-03 03:42:42,106 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:42,107 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1] [2022-11-03 03:42:42,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:42,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:42,307 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:42,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:42,308 INFO L85 PathProgramCache]: Analyzing trace with hash -355588487, now seen corresponding path program 14 times [2022-11-03 03:42:42,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:42,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753010633] [2022-11-03 03:42:42,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:42,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:42,316 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:42,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [682258280] [2022-11-03 03:42:42,317 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:42:42,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:42,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:42,318 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:42,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-03 03:42:42,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-03 03:42:42,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:42,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 64 conjunts are in the unsatisfiable core [2022-11-03 03:42:42,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:43,456 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 30 proven. 420 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-11-03 03:42:43,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:43,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:43,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753010633] [2022-11-03 03:42:43,717 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:43,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682258280] [2022-11-03 03:42:43,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682258280] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:43,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [334946065] [2022-11-03 03:42:43,719 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:43,720 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:43,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:43,720 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:43,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:44,060 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:44,147 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:45,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10654#(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 03:42:45,307 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:45,307 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:45,307 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-03 03:42:45,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613478915] [2022-11-03 03:42:45,308 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:45,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-03 03:42:45,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:45,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-03 03:42:45,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=900, Unknown=0, NotChecked=0, Total=992 [2022-11-03 03:42:45,309 INFO L87 Difference]: Start difference. First operand 168 states and 174 transitions. Second operand has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-03 03:42:46,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:46,002 INFO L93 Difference]: Finished difference Result 173 states and 178 transitions. [2022-11-03 03:42:46,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-03 03:42:46,002 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 125 [2022-11-03 03:42:46,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:46,004 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:46,004 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:46,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 231 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=103, Invalid=1019, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 03:42:46,005 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 2 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:46,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 730 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 842 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-03 03:42:46,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:46,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:46,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0476190476190477) internal successors, (132), 126 states have internal predecessors, (132), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:46,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 173 transitions. [2022-11-03 03:42:46,022 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 173 transitions. Word has length 125 [2022-11-03 03:42:46,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:46,023 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 173 transitions. [2022-11-03 03:42:46,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 19 states have internal predecessors, (52), 16 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-11-03 03:42:46,023 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 173 transitions. [2022-11-03 03:42:46,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2022-11-03 03:42:46,024 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:46,024 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1] [2022-11-03 03:42:46,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:46,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:46,231 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:46,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:46,231 INFO L85 PathProgramCache]: Analyzing trace with hash 2059821535, now seen corresponding path program 15 times [2022-11-03 03:42:46,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:46,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233479155] [2022-11-03 03:42:46,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:46,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:46,239 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:46,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1921803660] [2022-11-03 03:42:46,240 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:42:46,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:46,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:46,241 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:46,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-03 03:42:47,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:42:47,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:47,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 68 conjunts are in the unsatisfiable core [2022-11-03 03:42:47,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:47,662 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 32 proven. 480 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2022-11-03 03:42:47,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:48,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:48,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233479155] [2022-11-03 03:42:48,366 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:48,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921803660] [2022-11-03 03:42:48,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921803660] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:48,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1138216816] [2022-11-03 03:42:48,368 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:48,368 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:48,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:48,369 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:48,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:48,687 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:48,747 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:52,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11598#(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 03:42:52,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:52,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:52,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2022-11-03 03:42:52,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946050684] [2022-11-03 03:42:52,400 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:52,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-03 03:42:52,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:52,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-03 03:42:52,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=961, Unknown=0, NotChecked=0, Total=1056 [2022-11-03 03:42:52,402 INFO L87 Difference]: Start difference. First operand 168 states and 173 transitions. Second operand has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 03:42:53,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:53,217 INFO L93 Difference]: Finished difference Result 173 states and 177 transitions. [2022-11-03 03:42:53,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-03 03:42:53,220 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 133 [2022-11-03 03:42:53,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:53,221 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:53,221 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:53,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=106, Invalid=1084, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:42:53,222 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 2 mSDsluCounter, 739 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:53,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 809 Invalid, 945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 945 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-03 03:42:53,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:53,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:53,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0396825396825398) internal successors, (131), 126 states have internal predecessors, (131), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:53,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 172 transitions. [2022-11-03 03:42:53,241 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 172 transitions. Word has length 133 [2022-11-03 03:42:53,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:53,242 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 172 transitions. [2022-11-03 03:42:53,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 17 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-11-03 03:42:53,242 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 172 transitions. [2022-11-03 03:42:53,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2022-11-03 03:42:53,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:53,243 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1] [2022-11-03 03:42:53,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-11-03 03:42:53,449 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:53,450 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:53,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:53,450 INFO L85 PathProgramCache]: Analyzing trace with hash 1805113157, now seen corresponding path program 16 times [2022-11-03 03:42:53,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:53,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692851092] [2022-11-03 03:42:53,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:53,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:53,460 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:53,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [231202082] [2022-11-03 03:42:53,460 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:42:53,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:53,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:53,462 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:53,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-03 03:42:54,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:42:54,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 72 conjunts are in the unsatisfiable core [2022-11-03 03:42:54,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:54,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 34 proven. 544 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-11-03 03:42:54,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:54,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:54,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692851092] [2022-11-03 03:42:54,740 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:54,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231202082] [2022-11-03 03:42:54,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231202082] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:54,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1956047410] [2022-11-03 03:42:54,741 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:54,741 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:54,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:54,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:54,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:55,041 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:55,102 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:42:56,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12567#(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 03:42:56,405 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:42:56,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:42:56,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2022-11-03 03:42:56,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897842043] [2022-11-03 03:42:56,405 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:42:56,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-03 03:42:56,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:42:56,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-03 03:42:56,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1024, Unknown=0, NotChecked=0, Total=1122 [2022-11-03 03:42:56,408 INFO L87 Difference]: Start difference. First operand 168 states and 172 transitions. Second operand has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 03:42:57,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:42:57,356 INFO L93 Difference]: Finished difference Result 173 states and 176 transitions. [2022-11-03 03:42:57,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-03 03:42:57,357 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Word has length 141 [2022-11-03 03:42:57,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:42:57,358 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:42:57,358 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:42:57,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 261 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=109, Invalid=1151, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 03:42:57,359 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 2 mSDsluCounter, 818 mSDsCounter, 0 mSdLazyCounter, 1054 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 892 SdHoareTripleChecker+Invalid, 1054 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:42:57,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 892 Invalid, 1054 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1054 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 03:42:57,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:42:57,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:42:57,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:42:57,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 171 transitions. [2022-11-03 03:42:57,381 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 171 transitions. Word has length 141 [2022-11-03 03:42:57,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:42:57,381 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 171 transitions. [2022-11-03 03:42:57,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.761904761904762) internal successors, (58), 21 states have internal predecessors, (58), 18 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-11-03 03:42:57,382 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 171 transitions. [2022-11-03 03:42:57,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-11-03 03:42:57,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:42:57,384 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1] [2022-11-03 03:42:57,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-03 03:42:57,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-03 03:42:57,590 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:42:57,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:42:57,590 INFO L85 PathProgramCache]: Analyzing trace with hash 1432913579, now seen corresponding path program 17 times [2022-11-03 03:42:57,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:42:57,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18058010] [2022-11-03 03:42:57,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:42:57,591 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:42:57,604 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:42:57,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [203216454] [2022-11-03 03:42:57,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:42:57,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:42:57,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:42:57,606 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:42:57,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-03 03:42:58,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-03 03:42:58,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:42:58,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-03 03:42:58,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:42:59,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 36 proven. 612 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2022-11-03 03:42:59,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:42:59,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:42:59,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18058010] [2022-11-03 03:42:59,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:42:59,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203216454] [2022-11-03 03:42:59,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203216454] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:42:59,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089497039] [2022-11-03 03:42:59,561 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:42:59,561 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:42:59,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:42:59,562 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:42:59,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:42:59,863 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:42:59,925 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:43:04,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13561#(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 03:43:04,593 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:43:04,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:43:04,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2022-11-03 03:43:04,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326269719] [2022-11-03 03:43:04,594 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:43:04,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-03 03:43:04,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:43:04,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-03 03:43:04,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2022-11-03 03:43:04,595 INFO L87 Difference]: Start difference. First operand 168 states and 171 transitions. Second operand has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-03 03:43:05,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:43:05,601 INFO L93 Difference]: Finished difference Result 173 states and 175 transitions. [2022-11-03 03:43:05,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-03 03:43:05,602 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Word has length 149 [2022-11-03 03:43:05,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:43:05,603 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:43:05,604 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:43:05,604 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 276 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=112, Invalid=1220, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:43:05,605 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 2 mSDsluCounter, 901 mSDsCounter, 0 mSdLazyCounter, 1169 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-03 03:43:05,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 979 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1169 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-03 03:43:05,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:43:05,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:43:05,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:43:05,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2022-11-03 03:43:05,628 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 149 [2022-11-03 03:43:05,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:43:05,628 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2022-11-03 03:43:05,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.772727272727273) internal successors, (61), 22 states have internal predecessors, (61), 19 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-11-03 03:43:05,629 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2022-11-03 03:43:05,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2022-11-03 03:43:05,630 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:43:05,631 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1] [2022-11-03 03:43:05,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-11-03 03:43:05,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-03 03:43:05,840 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:43:05,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:43:05,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1247703057, now seen corresponding path program 18 times [2022-11-03 03:43:05,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:43:05,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414822874] [2022-11-03 03:43:05,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:43:05,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:43:05,850 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:43:05,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2034250806] [2022-11-03 03:43:05,851 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-03 03:43:05,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:43:05,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:43:05,852 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:43:05,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-03 03:43:07,713 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-03 03:43:07,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:43:07,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-03 03:43:07,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:43:08,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 38 proven. 684 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2022-11-03 03:43:08,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:43:08,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:43:08,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414822874] [2022-11-03 03:43:08,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:43:08,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034250806] [2022-11-03 03:43:08,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034250806] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:43:08,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1194042219] [2022-11-03 03:43:08,659 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:43:08,660 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:43:08,660 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:43:08,660 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:43:08,660 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:43:08,975 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:43:09,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:43:10,420 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14580#(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 03:43:10,420 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:43:10,420 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:43:10,420 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2022-11-03 03:43:10,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014802152] [2022-11-03 03:43:10,420 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:43:10,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-03 03:43:10,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:43:10,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-03 03:43:10,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2022-11-03 03:43:10,422 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-03 03:43:11,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:43:11,632 INFO L93 Difference]: Finished difference Result 173 states and 174 transitions. [2022-11-03 03:43:11,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-03 03:43:11,633 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 157 [2022-11-03 03:43:11,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:43:11,634 INFO L225 Difference]: With dead ends: 173 [2022-11-03 03:43:11,634 INFO L226 Difference]: Without dead ends: 168 [2022-11-03 03:43:11,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 291 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=115, Invalid=1291, Unknown=0, NotChecked=0, Total=1406 [2022-11-03 03:43:11,636 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 2 mSDsluCounter, 988 mSDsCounter, 0 mSdLazyCounter, 1290 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1070 SdHoareTripleChecker+Invalid, 1290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:43:11,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 1070 Invalid, 1290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1290 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-03 03:43:11,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-03 03:43:11,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2022-11-03 03:43:11,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 126 states have (on average 1.0158730158730158) internal successors, (128), 126 states have internal predecessors, (128), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:43:11,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2022-11-03 03:43:11,658 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 157 [2022-11-03 03:43:11,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:43:11,659 INFO L495 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2022-11-03 03:43:11,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 20 states have call successors, (20), 2 states have call predecessors, (20), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-11-03 03:43:11,659 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2022-11-03 03:43:11,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2022-11-03 03:43:11,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:43:11,661 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1] [2022-11-03 03:43:11,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-03 03:43:11,869 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:43:11,869 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:43:11,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:43:11,869 INFO L85 PathProgramCache]: Analyzing trace with hash -694185097, now seen corresponding path program 19 times [2022-11-03 03:43:11,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:43:11,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587697993] [2022-11-03 03:43:11,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:43:11,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:43:11,880 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:43:11,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [162235959] [2022-11-03 03:43:11,880 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:43:11,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:43:11,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:43:11,881 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:43:11,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-03 03:43:12,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:43:12,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-03 03:43:12,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:43:13,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 40 proven. 760 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2022-11-03 03:43:13,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 03:43:13,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:43:13,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587697993] [2022-11-03 03:43:13,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-03 03:43:13,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162235959] [2022-11-03 03:43:13,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162235959] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:43:13,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137628858] [2022-11-03 03:43:13,642 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-11-03 03:43:13,642 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 03:43:13,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 03:43:13,642 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 03:43:13,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 03:43:13,973 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 62 for LOIs [2022-11-03 03:43:14,044 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 03:43:17,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15624#(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 03:43:17,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-03 03:43:17,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:43:17,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2022-11-03 03:43:17,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760195666] [2022-11-03 03:43:17,777 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-03 03:43:17,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-03 03:43:17,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:43:17,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-03 03:43:17,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1225, Unknown=0, NotChecked=0, Total=1332 [2022-11-03 03:43:17,780 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:43:18,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:43:18,873 INFO L93 Difference]: Finished difference Result 175 states and 177 transitions. [2022-11-03 03:43:18,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-03 03:43:18,873 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Word has length 165 [2022-11-03 03:43:18,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:43:18,875 INFO L225 Difference]: With dead ends: 175 [2022-11-03 03:43:18,875 INFO L226 Difference]: Without dead ends: 170 [2022-11-03 03:43:18,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 306 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=118, Invalid=1364, Unknown=0, NotChecked=0, Total=1482 [2022-11-03 03:43:18,876 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 2 mSDsluCounter, 1079 mSDsCounter, 0 mSdLazyCounter, 1417 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 1165 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:43:18,877 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 1165 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1417 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-03 03:43:18,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-11-03 03:43:18,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2022-11-03 03:43:18,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 127 states have (on average 1.015748031496063) internal successors, (129), 127 states have internal predecessors, (129), 22 states have call successors, (22), 21 states have call predecessors, (22), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-11-03 03:43:18,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 172 transitions. [2022-11-03 03:43:18,896 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 172 transitions. Word has length 165 [2022-11-03 03:43:18,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:43:18,897 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 172 transitions. [2022-11-03 03:43:18,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 24 states have internal predecessors, (67), 21 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:43:18,897 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 172 transitions. [2022-11-03 03:43:18,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-11-03 03:43:18,898 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:43:18,898 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2022-11-03 03:43:18,909 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-11-03 03:43:19,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-03 03:43:19,105 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:43:19,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:43:19,105 INFO L85 PathProgramCache]: Analyzing trace with hash -606660388, now seen corresponding path program 4 times [2022-11-03 03:43:19,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:43:19,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367759271] [2022-11-03 03:43:19,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:43:19,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:43:19,114 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-03 03:43:19,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1328156074] [2022-11-03 03:43:19,115 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-03 03:43:19,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:43:19,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:43:19,116 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:43:19,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-03 03:43:19,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 03:43:19,717 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-11-03 03:43:20,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 03:43:20,252 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-11-03 03:43:20,252 INFO L359 BasicCegarLoop]: Counterexample is feasible [2022-11-03 03:43:20,253 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-03 03:43:20,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-03 03:43:20,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-03 03:43:20,466 INFO L444 BasicCegarLoop]: Path program histogram: [19, 4, 1, 1, 1, 1] [2022-11-03 03:43:20,470 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-03 03:43:20,539 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.11 03:43:20 BoogieIcfgContainer [2022-11-03 03:43:20,540 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-03 03:43:20,540 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-03 03:43:20,540 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-03 03:43:20,541 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-03 03:43:20,541 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:40:33" (3/4) ... [2022-11-03 03:43:20,544 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-11-03 03:43:20,649 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/witness.graphml [2022-11-03 03:43:20,652 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-03 03:43:20,653 INFO L158 Benchmark]: Toolchain (without parser) took 167988.94ms. Allocated memory was 98.6MB in the beginning and 159.4MB in the end (delta: 60.8MB). Free memory was 57.5MB in the beginning and 67.7MB in the end (delta: -10.3MB). Peak memory consumption was 49.6MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,653 INFO L158 Benchmark]: CDTParser took 0.32ms. Allocated memory is still 98.6MB. Free memory was 73.5MB in the beginning and 73.5MB in the end (delta: 44.9kB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 03:43:20,653 INFO L158 Benchmark]: CACSL2BoogieTranslator took 328.45ms. Allocated memory is still 98.6MB. Free memory was 57.2MB in the beginning and 73.5MB in the end (delta: -16.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,654 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.82ms. Allocated memory is still 98.6MB. Free memory was 73.5MB in the beginning and 71.9MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,657 INFO L158 Benchmark]: Boogie Preprocessor took 40.74ms. Allocated memory is still 98.6MB. Free memory was 71.9MB in the beginning and 70.9MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,659 INFO L158 Benchmark]: RCFGBuilder took 396.53ms. Allocated memory is still 98.6MB. Free memory was 70.9MB in the beginning and 60.2MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,660 INFO L158 Benchmark]: TraceAbstraction took 167064.34ms. Allocated memory was 98.6MB in the beginning and 159.4MB in the end (delta: 60.8MB). Free memory was 59.4MB in the beginning and 74.0MB in the end (delta: -14.7MB). Peak memory consumption was 47.5MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,660 INFO L158 Benchmark]: Witness Printer took 112.02ms. Allocated memory is still 159.4MB. Free memory was 74.0MB in the beginning and 67.7MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-11-03 03:43:20,661 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32ms. Allocated memory is still 98.6MB. Free memory was 73.5MB in the beginning and 73.5MB in the end (delta: 44.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 328.45ms. Allocated memory is still 98.6MB. Free memory was 57.2MB in the beginning and 73.5MB in the end (delta: -16.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.82ms. Allocated memory is still 98.6MB. Free memory was 73.5MB in the beginning and 71.9MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 40.74ms. Allocated memory is still 98.6MB. Free memory was 71.9MB in the beginning and 70.9MB in the end (delta: 1.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 396.53ms. Allocated memory is still 98.6MB. Free memory was 70.9MB in the beginning and 60.2MB in the end (delta: 10.8MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 167064.34ms. Allocated memory was 98.6MB in the beginning and 159.4MB in the end (delta: 60.8MB). Free memory was 59.4MB in the beginning and 74.0MB in the end (delta: -14.7MB). Peak memory consumption was 47.5MB. Max. memory is 16.1GB. * Witness Printer took 112.02ms. Allocated memory is still 159.4MB. Free memory was 74.0MB in the beginning and 67.7MB in the end (delta: 6.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 12]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L17] int counter = 0; [L19] short k; [L20] long long y, x, c; [L21] k = __VERIFIER_nondet_short() [L23] y = 0 [L24] x = 0 [L25] c = 0 VAL [c=0, counter=0, k=21, x=0, y=0] [L27] EXPR counter++ VAL [c=0, counter=1, counter++=0, k=21, x=0, y=0] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=1] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=0, counter=1, k=21, x=0, y=0] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=1, counter=1, k=21, x=1, y=1] [L27] EXPR counter++ VAL [c=1, counter=2, counter++=1, k=21, x=1, y=1] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=2] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=1, counter=2, k=21, x=1, y=1] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=2, counter=2, k=21, x=9, y=2] [L27] EXPR counter++ VAL [c=2, counter=3, counter++=2, k=21, x=9, y=2] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=3] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=2, counter=3, k=21, x=9, y=2] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=3, counter=3, k=21, x=36, y=3] [L27] EXPR counter++ VAL [c=3, counter=4, counter++=3, k=21, x=36, y=3] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=4] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=4] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=3, counter=4, k=21, x=36, y=3] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=4, counter=4, k=21, x=100, y=4] [L27] EXPR counter++ VAL [c=4, counter=5, counter++=4, k=21, x=100, y=4] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=5] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=5] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=4, counter=5, k=21, x=100, y=4] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=5, counter=5, k=21, x=225, y=5] [L27] EXPR counter++ VAL [c=5, counter=6, counter++=5, k=21, x=225, y=5] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=6] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=6] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=5, counter=6, k=21, x=225, y=5] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=6, counter=6, k=21, x=441, y=6] [L27] EXPR counter++ VAL [c=6, counter=7, counter++=6, k=21, x=441, y=6] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=7] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=7] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=6, counter=7, k=21, x=441, y=6] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=7, counter=7, k=21, x=784, y=7] [L27] EXPR counter++ VAL [c=7, counter=8, counter++=7, k=21, x=784, y=7] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=8] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=8] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=7, counter=8, k=21, x=784, y=7] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=8, counter=8, k=21, x=1296, y=8] [L27] EXPR counter++ VAL [c=8, counter=9, counter++=8, k=21, x=1296, y=8] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=9] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=9] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=8, counter=9, k=21, x=1296, y=8] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=9, counter=9, k=21, x=2025, y=9] [L27] EXPR counter++ VAL [c=9, counter=10, counter++=9, k=21, x=2025, y=9] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=10] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=10] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=9, counter=10, k=21, x=2025, y=9] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=10, counter=10, k=21, x=3025, y=10] [L27] EXPR counter++ VAL [c=10, counter=11, counter++=10, k=21, x=3025, y=10] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=11] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=11] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=10, counter=11, k=21, x=3025, y=10] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=11, counter=11, k=21, x=4356, y=11] [L27] EXPR counter++ VAL [c=11, counter=12, counter++=11, k=21, x=4356, y=11] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=12] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=12] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=11, counter=12, k=21, x=4356, y=11] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=12, counter=12, k=21, x=6084, y=12] [L27] EXPR counter++ VAL [c=12, counter=13, counter++=12, k=21, x=6084, y=12] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=13] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=13] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=12, counter=13, k=21, x=6084, y=12] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=13, counter=13, k=21, x=8281, y=13] [L27] EXPR counter++ VAL [c=13, counter=14, counter++=13, k=21, x=8281, y=13] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=14] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=14] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=13, counter=14, k=21, x=8281, y=13] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=14, counter=14, k=21, x=11025, y=14] [L27] EXPR counter++ VAL [c=14, counter=15, counter++=14, k=21, x=11025, y=14] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=15] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=15] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=14, counter=15, k=21, x=11025, y=14] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=15, counter=15, k=21, x=14400, y=15] [L27] EXPR counter++ VAL [c=15, counter=16, counter++=15, k=21, x=14400, y=15] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=16] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=16] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=15, counter=16, k=21, x=14400, y=15] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=16, counter=16, k=21, x=18496, y=16] [L27] EXPR counter++ VAL [c=16, counter=17, counter++=16, k=21, x=18496, y=16] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=17] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=17] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=16, counter=17, k=21, x=18496, y=16] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=17, counter=17, k=21, x=23409, y=17] [L27] EXPR counter++ VAL [c=17, counter=18, counter++=17, k=21, x=23409, y=17] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=18] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=18] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=17, counter=18, k=21, x=23409, y=17] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=18, counter=18, k=21, x=29241, y=18] [L27] EXPR counter++ VAL [c=18, counter=19, counter++=18, k=21, x=29241, y=18] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=19] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=19] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=18, counter=19, k=21, x=29241, y=18] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=19, counter=19, k=21, x=36100, y=19] [L27] EXPR counter++ VAL [c=19, counter=20, counter++=19, k=21, x=36100, y=19] [L27] COND TRUE counter++<20 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, counter=20] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=20] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [c=19, counter=20, k=21, x=36100, y=19] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [c=20, counter=20, k=21, x=44100, y=20] [L27] EXPR counter++ VAL [c=20, counter=21, counter++=20, k=21, x=44100, y=20] [L27] COND FALSE !(counter++<20) [L37] CALL __VERIFIER_assert(k*y - (y*y) == 0) VAL [\old(cond)=0, counter=21] [L10] COND TRUE !(cond) VAL [\old(cond)=0, cond=0, counter=21] [L12] reach_error() VAL [\old(cond)=0, cond=0, counter=21] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 166.9s, OverallIterations: 27, TraceHistogramMax: 21, PathProgramHistogramMax: 19, EmptinessCheckTime: 0.0s, AutomataDifference: 11.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 468 SdHoareTripleChecker+Valid, 9.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 463 mSDsluCounter, 10310 SdHoareTripleChecker+Invalid, 8.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 9257 mSDsCounter, 121 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 11478 IncrementalHoareTripleChecker+Invalid, 11599 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 121 mSolverCounterUnsat, 1097 mSDtfsCounter, 11478 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 4475 GetRequests, 3766 SyntacticMatches, 42 SemanticMatches, 667 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2130 ImplicationChecksByTransitivity, 112.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=170occurred in iteration=26, InterpolantAutomatonStates: 397, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 26 MinimizatonAttempts, 80 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 14.4s SatisfiabilityAnalysisTime, 39.3s InterpolantComputationTime, 2123 NumberOfCodeBlocks, 2123 NumberOfCodeBlocksAsserted, 97 NumberOfCheckSat, 2069 ConstructedInterpolants, 0 QuantifiedInterpolants, 8454 SizeOfPredicates, 58 NumberOfNonLiveVariables, 5786 ConjunctsInSsa, 986 ConjunctsInUnsatCore, 30 InterpolantComputations, 4 PerfectInterpolantSequences, 6007/12004 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-11-03 03:43:20,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_58c53a42-9ea5-4dd2-9090-8fc48fe97e8e/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE