./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS --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 c3e4caaff40cd418d8c93f0410c37d1e421cc5f90c41578bfaa7bb16ff289f1e --- 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-8393723 [2022-11-19 08:03:33,276 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:03:33,278 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:03:33,305 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:03:33,308 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:03:33,313 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:03:33,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:03:33,323 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:03:33,325 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:03:33,330 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:03:33,331 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:03:33,333 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:03:33,334 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:03:33,337 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:03:33,339 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:03:33,341 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:03:33,343 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:03:33,349 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:03:33,350 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:03:33,352 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:03:33,358 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:03:33,360 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:03:33,361 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:03:33,362 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:03:33,366 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:03:33,373 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:03:33,373 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:03:33,374 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:03:33,376 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:03:33,377 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:03:33,379 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:03:33,380 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:03:33,381 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:03:33,383 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:03:33,385 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:03:33,386 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:03:33,387 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:03:33,387 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:03:33,387 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:03:33,388 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:03:33,389 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:03:33,391 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:03:33,438 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:03:33,439 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:03:33,440 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:03:33,440 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:03:33,441 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:03:33,441 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:03:33,441 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:03:33,441 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:03:33,442 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:03:33,442 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:03:33,443 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:03:33,443 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:03:33,443 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:03:33,444 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:03:33,444 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:03:33,444 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:03:33,444 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:03:33,445 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:03:33,445 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:03:33,446 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:03:33,446 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:03:33,446 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:03:33,446 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:03:33,448 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:03:33,448 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:03:33,448 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:03:33,448 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:03:33,449 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:03:33,449 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:03:33,449 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:03:33,449 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:03:33,450 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:03:33,451 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:03:33,451 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:03:33,451 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:03:33,451 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:03:33,452 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:03:33,452 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:03:33,452 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:03:33,452 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:03:33,452 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:03:33,453 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_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c3e4caaff40cd418d8c93f0410c37d1e421cc5f90c41578bfaa7bb16ff289f1e [2022-11-19 08:03:33,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:03:33,808 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:03:33,811 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:03:33,813 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:03:33,814 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:03:33,815 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c [2022-11-19 08:03:33,895 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/data/40ec1025b/4d480bea42da45f6a302f79dc2225aa2/FLAG5daa8aa86 [2022-11-19 08:03:34,364 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:03:34,365 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c [2022-11-19 08:03:34,372 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/data/40ec1025b/4d480bea42da45f6a302f79dc2225aa2/FLAG5daa8aa86 [2022-11-19 08:03:34,745 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/data/40ec1025b/4d480bea42da45f6a302f79dc2225aa2 [2022-11-19 08:03:34,751 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:03:34,754 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:03:34,759 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:03:34,759 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:03:34,764 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:03:34,765 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:03:34" (1/1) ... [2022-11-19 08:03:34,768 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d7dcab5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:34, skipping insertion in model container [2022-11-19 08:03:34,769 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:03:34" (1/1) ... [2022-11-19 08:03:34,777 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:03:34,800 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:03:35,085 WARN L234 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_e829c458-b393-4d6a-8a52-618d519ed6a3/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c[490,503] [2022-11-19 08:03:35,124 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:03:35,142 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:03:35,159 WARN L234 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_e829c458-b393-4d6a-8a52-618d519ed6a3/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound100.c[490,503] [2022-11-19 08:03:35,191 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:03:35,210 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:03:35,210 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35 WrapperNode [2022-11-19 08:03:35,211 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:03:35,213 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:03:35,213 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:03:35,213 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:03:35,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,230 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,260 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2022-11-19 08:03:35,261 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:03:35,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:03:35,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:03:35,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:03:35,274 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,287 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,288 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,304 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,309 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,311 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:03:35,314 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:03:35,314 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:03:35,314 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:03:35,316 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (1/1) ... [2022-11-19 08:03:35,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:03:35,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:35,354 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:03:35,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:03:35,412 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:03:35,412 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-19 08:03:35,413 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-19 08:03:35,413 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:03:35,413 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:03:35,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:03:35,413 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-19 08:03:35,413 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-19 08:03:35,501 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:03:35,504 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:03:35,726 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:03:35,751 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:03:35,752 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-19 08:03:35,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:03:35 BoogieIcfgContainer [2022-11-19 08:03:35,755 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:03:35,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:03:35,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:03:35,762 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:03:35,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:03:34" (1/3) ... [2022-11-19 08:03:35,763 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4841992f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:03:35, skipping insertion in model container [2022-11-19 08:03:35,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:03:35" (2/3) ... [2022-11-19 08:03:35,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4841992f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:03:35, skipping insertion in model container [2022-11-19 08:03:35,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:03:35" (3/3) ... [2022-11-19 08:03:35,765 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound100.c [2022-11-19 08:03:35,785 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:03:35,786 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 08:03:35,839 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:03:35,846 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;@4c14d5e0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:03:35,847 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 08:03:35,851 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-19 08:03:35,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-19 08:03:35,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:35,861 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:35,862 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:35,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:35,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1539547475, now seen corresponding path program 1 times [2022-11-19 08:03:35,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:35,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536059956] [2022-11-19 08:03:35,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:35,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:36,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:36,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:36,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536059956] [2022-11-19 08:03:36,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2022-11-19 08:03:36,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314687226] [2022-11-19 08:03:36,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:36,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:36,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:36,047 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:36,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:03:36,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:36,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 1 conjunts are in the unsatisfiable core [2022-11-19 08:03:36,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:36,168 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:03:36,169 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:03:36,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314687226] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:36,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:03:36,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 08:03:36,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262919024] [2022-11-19 08:03:36,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:36,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-19 08:03:36,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:36,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-19 08:03:36,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 08:03:36,210 INFO L87 Difference]: Start difference. First operand has 30 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 18 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:36,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:36,247 INFO L93 Difference]: Finished difference Result 51 states and 79 transitions. [2022-11-19 08:03:36,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-19 08:03:36,250 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2022-11-19 08:03:36,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:36,258 INFO L225 Difference]: With dead ends: 51 [2022-11-19 08:03:36,259 INFO L226 Difference]: Without dead ends: 28 [2022-11-19 08:03:36,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-19 08:03:36,282 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:36,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 36 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:03:36,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-19 08:03:36,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-11-19 08:03:36,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:03:36,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 37 transitions. [2022-11-19 08:03:36,326 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 37 transitions. Word has length 20 [2022-11-19 08:03:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:36,328 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 37 transitions. [2022-11-19 08:03:36,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:36,329 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 37 transitions. [2022-11-19 08:03:36,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-19 08:03:36,331 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:36,331 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:36,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:36,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-19 08:03:36,538 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:36,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:36,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1863391506, now seen corresponding path program 1 times [2022-11-19 08:03:36,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:36,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [727649721] [2022-11-19 08:03:36,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:36,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:36,577 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:36,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [640601183] [2022-11-19 08:03:36,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:36,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:36,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:36,585 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:36,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:03:36,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:36,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:03:36,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:36,747 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 08:03:36,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:03:36,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:36,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [727649721] [2022-11-19 08:03:36,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:36,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640601183] [2022-11-19 08:03:36,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640601183] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:36,749 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:03:36,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:03:36,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241416925] [2022-11-19 08:03:36,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:36,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:03:36,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:36,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:03:36,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:03:36,752 INFO L87 Difference]: Start difference. First operand 28 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:36,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:36,883 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-11-19 08:03:36,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:03:36,884 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 21 [2022-11-19 08:03:36,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:36,886 INFO L225 Difference]: With dead ends: 47 [2022-11-19 08:03:36,886 INFO L226 Difference]: Without dead ends: 40 [2022-11-19 08:03:36,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:03:36,888 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 30 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:36,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 78 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:03:36,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-19 08:03:36,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 30. [2022-11-19 08:03:36,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 19 states have internal predecessors, (22), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-19 08:03:36,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-11-19 08:03:36,902 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2022-11-19 08:03:36,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:36,902 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-11-19 08:03:36,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:36,903 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-11-19 08:03:36,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-19 08:03:36,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:36,904 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:36,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:37,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:37,111 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:37,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:37,113 INFO L85 PathProgramCache]: Analyzing trace with hash -73319670, now seen corresponding path program 1 times [2022-11-19 08:03:37,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:37,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105453992] [2022-11-19 08:03:37,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:37,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:37,173 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:37,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [171589956] [2022-11-19 08:03:37,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:37,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:37,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:37,176 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:37,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:03:37,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:37,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 08:03:37,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:37,476 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 08:03:37,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:03:37,477 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:37,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105453992] [2022-11-19 08:03:37,477 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:37,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171589956] [2022-11-19 08:03:37,478 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171589956] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:37,478 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:03:37,478 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-19 08:03:37,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409362858] [2022-11-19 08:03:37,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:37,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 08:03:37,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:37,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 08:03:37,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:03:37,480 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:37,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:37,617 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-11-19 08:03:37,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 08:03:37,618 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2022-11-19 08:03:37,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:37,619 INFO L225 Difference]: With dead ends: 46 [2022-11-19 08:03:37,619 INFO L226 Difference]: Without dead ends: 44 [2022-11-19 08:03:37,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-11-19 08:03:37,626 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 31 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:37,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 114 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:03:37,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-19 08:03:37,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-11-19 08:03:37,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-19 08:03:37,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 57 transitions. [2022-11-19 08:03:37,648 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 57 transitions. Word has length 24 [2022-11-19 08:03:37,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:37,648 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 57 transitions. [2022-11-19 08:03:37,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-19 08:03:37,649 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 57 transitions. [2022-11-19 08:03:37,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 08:03:37,650 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:37,650 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:37,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:37,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:37,851 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:37,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:37,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1101454984, now seen corresponding path program 1 times [2022-11-19 08:03:37,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:37,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586726246] [2022-11-19 08:03:37,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:37,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:37,869 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:37,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2075503437] [2022-11-19 08:03:37,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:37,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:37,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:37,871 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:37,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:03:37,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:37,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:03:37,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:38,039 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 08:03:38,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:38,181 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 08:03:38,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:38,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586726246] [2022-11-19 08:03:38,187 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:38,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075503437] [2022-11-19 08:03:38,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075503437] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:38,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327609459] [2022-11-19 08:03:38,222 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-19 08:03:38,223 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:38,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:38,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:38,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:39,348 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:03:39,377 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:41,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [327609459] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:41,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:03:41,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [7, 7] total 18 [2022-11-19 08:03:41,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978429791] [2022-11-19 08:03:41,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:41,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-19 08:03:41,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:41,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-19 08:03:41,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-19 08:03:41,788 INFO L87 Difference]: Start difference. First operand 43 states and 57 transitions. Second operand has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-19 08:03:42,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:42,193 INFO L93 Difference]: Finished difference Result 71 states and 97 transitions. [2022-11-19 08:03:42,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:03:42,194 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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 26 [2022-11-19 08:03:42,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:42,198 INFO L225 Difference]: With dead ends: 71 [2022-11-19 08:03:42,198 INFO L226 Difference]: Without dead ends: 64 [2022-11-19 08:03:42,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2022-11-19 08:03:42,206 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:42,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 58 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:03:42,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-11-19 08:03:42,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2022-11-19 08:03:42,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 34 states have internal predecessors, (41), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-11-19 08:03:42,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-11-19 08:03:42,256 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 26 [2022-11-19 08:03:42,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:42,257 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-11-19 08:03:42,257 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 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) [2022-11-19 08:03:42,257 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-11-19 08:03:42,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-19 08:03:42,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:42,259 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:42,280 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:42,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-11-19 08:03:42,466 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:42,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:42,467 INFO L85 PathProgramCache]: Analyzing trace with hash -156943002, now seen corresponding path program 1 times [2022-11-19 08:03:42,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:42,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725120847] [2022-11-19 08:03:42,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:42,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:42,483 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:42,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [808694969] [2022-11-19 08:03:42,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:42,484 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:42,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:42,485 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:42,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:03:42,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:42,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 08:03:42,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:42,655 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:03:42,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:42,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:42,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725120847] [2022-11-19 08:03:42,779 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:42,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808694969] [2022-11-19 08:03:42,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808694969] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:03:42,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676435631] [2022-11-19 08:03:42,782 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-19 08:03:42,783 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:42,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:42,783 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:42,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:43,245 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-19 08:03:43,256 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:03:43,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:44,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1676435631] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:44,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:03:44,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [7] total 20 [2022-11-19 08:03:44,730 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372367851] [2022-11-19 08:03:44,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:44,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 08:03:44,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:44,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 08:03:44,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-19 08:03:44,732 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:03:45,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:45,216 INFO L93 Difference]: Finished difference Result 72 states and 97 transitions. [2022-11-19 08:03:45,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 08:03:45,217 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 29 [2022-11-19 08:03:45,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:45,221 INFO L225 Difference]: With dead ends: 72 [2022-11-19 08:03:45,222 INFO L226 Difference]: Without dead ends: 70 [2022-11-19 08:03:45,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-11-19 08:03:45,224 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 103 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 222 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:45,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 57 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 08:03:45,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-19 08:03:45,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 65. [2022-11-19 08:03:45,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 21 states have call successors, (21), 4 states have call predecessors, (21), 4 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-19 08:03:45,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2022-11-19 08:03:45,277 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 29 [2022-11-19 08:03:45,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:45,278 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2022-11-19 08:03:45,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 1.4) internal successors, (14), 8 states have internal predecessors, (14), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-19 08:03:45,280 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2022-11-19 08:03:45,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-19 08:03:45,281 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:45,281 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:45,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:45,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:45,493 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:45,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:45,494 INFO L85 PathProgramCache]: Analyzing trace with hash 187338980, now seen corresponding path program 1 times [2022-11-19 08:03:45,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:45,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345824395] [2022-11-19 08:03:45,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:45,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:45,517 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:45,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2033017072] [2022-11-19 08:03:45,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:45,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:45,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:45,529 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:45,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:03:45,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:45,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2022-11-19 08:03:45,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:45,753 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-19 08:03:45,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:45,928 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:03:45,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345824395] [2022-11-19 08:03:45,929 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033017072] [2022-11-19 08:03:45,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033017072] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:45,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501579445] [2022-11-19 08:03:45,932 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-19 08:03:45,932 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:45,933 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:45,933 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:45,933 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:46,715 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2022-11-19 08:03:46,722 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:03:46,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:49,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1501579445] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:03:49,481 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:03:49,481 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [8, 6] total 26 [2022-11-19 08:03:49,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984117169] [2022-11-19 08:03:49,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:03:49,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 08:03:49,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:49,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 08:03:49,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-19 08:03:49,484 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-19 08:03:50,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:50,053 INFO L93 Difference]: Finished difference Result 96 states and 128 transitions. [2022-11-19 08:03:50,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 08:03:50,055 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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 29 [2022-11-19 08:03:50,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:50,057 INFO L225 Difference]: With dead ends: 96 [2022-11-19 08:03:50,057 INFO L226 Difference]: Without dead ends: 94 [2022-11-19 08:03:50,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2022-11-19 08:03:50,059 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 86 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:50,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 56 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 08:03:50,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-11-19 08:03:50,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 88. [2022-11-19 08:03:50,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.196078431372549) internal successors, (61), 54 states have internal predecessors, (61), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (28), 26 states have call predecessors, (28), 28 states have call successors, (28) [2022-11-19 08:03:50,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 118 transitions. [2022-11-19 08:03:50,110 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 118 transitions. Word has length 29 [2022-11-19 08:03:50,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:50,110 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 118 transitions. [2022-11-19 08:03:50,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 9 states have internal predecessors, (14), 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) [2022-11-19 08:03:50,111 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 118 transitions. [2022-11-19 08:03:50,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-19 08:03:50,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:50,113 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:50,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:50,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:50,319 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:03:50,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:50,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1193022788, now seen corresponding path program 1 times [2022-11-19 08:03:50,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:50,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860582567] [2022-11-19 08:03:50,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:50,320 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:50,335 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:03:50,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [706225763] [2022-11-19 08:03:50,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:50,336 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:50,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:50,337 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:50,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:03:50,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:50,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-19 08:03:50,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:51,444 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 08:03:51,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:53,578 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-19 08:03:53,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:53,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860582567] [2022-11-19 08:03:53,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:03:53,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706225763] [2022-11-19 08:03:53,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706225763] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:53,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337813791] [2022-11-19 08:03:53,587 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-19 08:03:53,587 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:53,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:53,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:53,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:01,779 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:04:01,790 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:04:01,804 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:11,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2087#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:04:11,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:11,946 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:11,946 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 26 [2022-11-19 08:04:11,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219884036] [2022-11-19 08:04:11,947 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:11,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 08:04:11,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:11,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 08:04:11,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1853, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 08:04:11,949 INFO L87 Difference]: Start difference. First operand 88 states and 118 transitions. Second operand has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-19 08:04:27,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:27,460 INFO L93 Difference]: Finished difference Result 218 states and 311 transitions. [2022-11-19 08:04:27,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 08:04:27,461 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) Word has length 51 [2022-11-19 08:04:27,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:27,464 INFO L225 Difference]: With dead ends: 218 [2022-11-19 08:04:27,464 INFO L226 Difference]: Without dead ends: 180 [2022-11-19 08:04:27,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1552 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=554, Invalid=4276, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 08:04:27,467 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 151 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 1506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:27,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 196 Invalid, 1506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 7.4s Time] [2022-11-19 08:04:27,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-11-19 08:04:27,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 137. [2022-11-19 08:04:27,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 87 states have (on average 1.2413793103448276) internal successors, (108), 88 states have internal predecessors, (108), 41 states have call successors, (41), 8 states have call predecessors, (41), 8 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2022-11-19 08:04:27,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 189 transitions. [2022-11-19 08:04:27,585 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 189 transitions. Word has length 51 [2022-11-19 08:04:27,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:27,586 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 189 transitions. [2022-11-19 08:04:27,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 9 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 5 states have call predecessors, (14), 7 states have call successors, (14) [2022-11-19 08:04:27,587 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 189 transitions. [2022-11-19 08:04:27,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-19 08:04:27,588 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:27,588 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:27,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:27,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:27,795 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:27,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:27,796 INFO L85 PathProgramCache]: Analyzing trace with hash -900294476, now seen corresponding path program 1 times [2022-11-19 08:04:27,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:27,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222455503] [2022-11-19 08:04:27,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:27,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:27,809 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:27,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [187639492] [2022-11-19 08:04:27,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:27,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:27,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:27,820 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:27,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:04:27,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:27,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 08:04:27,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:27,927 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-19 08:04:27,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:04:27,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:27,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222455503] [2022-11-19 08:04:27,928 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:27,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187639492] [2022-11-19 08:04:27,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187639492] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:04:27,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:04:27,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:04:27,929 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907444271] [2022-11-19 08:04:27,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:04:27,932 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:04:27,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:27,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:04:27,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:04:27,934 INFO L87 Difference]: Start difference. First operand 137 states and 189 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 08:04:28,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:28,094 INFO L93 Difference]: Finished difference Result 229 states and 321 transitions. [2022-11-19 08:04:28,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:04:28,095 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-11-19 08:04:28,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:28,097 INFO L225 Difference]: With dead ends: 229 [2022-11-19 08:04:28,097 INFO L226 Difference]: Without dead ends: 166 [2022-11-19 08:04:28,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:04:28,099 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 4 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:28,099 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 84 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 08:04:28,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-11-19 08:04:28,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 155. [2022-11-19 08:04:28,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 93 states have (on average 1.2365591397849462) internal successors, (115), 94 states have internal predecessors, (115), 53 states have call successors, (53), 8 states have call predecessors, (53), 8 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-19 08:04:28,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-19 08:04:28,187 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 54 [2022-11-19 08:04:28,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:28,188 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-19 08:04:28,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 5 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 08:04:28,188 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-19 08:04:28,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 08:04:28,190 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:28,190 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:28,196 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-19 08:04:28,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-19 08:04:28,396 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:28,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:28,397 INFO L85 PathProgramCache]: Analyzing trace with hash 1047855047, now seen corresponding path program 1 times [2022-11-19 08:04:28,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:28,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687049485] [2022-11-19 08:04:28,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:28,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:28,409 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:28,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2042257649] [2022-11-19 08:04:28,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:28,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:28,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:28,411 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:28,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 08:04:28,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:28,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-19 08:04:28,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:28,635 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 25 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-19 08:04:28,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 27 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 08:04:28,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:28,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687049485] [2022-11-19 08:04:28,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:28,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042257649] [2022-11-19 08:04:28,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042257649] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:28,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145017336] [2022-11-19 08:04:28,779 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-19 08:04:28,779 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:28,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:28,780 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:28,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:35,038 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:04:35,046 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:04:35,061 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:37,054 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3853#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:04:37,054 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:37,055 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:37,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2022-11-19 08:04:37,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522672195] [2022-11-19 08:04:37,055 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:37,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 08:04:37,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:37,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 08:04:37,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=741, Unknown=0, NotChecked=0, Total=870 [2022-11-19 08:04:37,057 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-19 08:04:37,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:37,606 INFO L93 Difference]: Finished difference Result 198 states and 272 transitions. [2022-11-19 08:04:37,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-19 08:04:37,607 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 61 [2022-11-19 08:04:37,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:37,609 INFO L225 Difference]: With dead ends: 198 [2022-11-19 08:04:37,609 INFO L226 Difference]: Without dead ends: 196 [2022-11-19 08:04:37,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 08:04:37,611 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 390 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:37,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 111 Invalid, 390 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:04:37,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-11-19 08:04:37,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 167. [2022-11-19 08:04:37,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 102 states have (on average 1.2156862745098038) internal successors, (124), 103 states have internal predecessors, (124), 53 states have call successors, (53), 11 states have call predecessors, (53), 11 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-19 08:04:37,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 229 transitions. [2022-11-19 08:04:37,717 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 229 transitions. Word has length 61 [2022-11-19 08:04:37,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:37,718 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 229 transitions. [2022-11-19 08:04:37,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 12 states have internal predecessors, (33), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2022-11-19 08:04:37,718 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 229 transitions. [2022-11-19 08:04:37,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 08:04:37,720 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:37,720 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:37,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:37,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:37,926 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:04:37,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:37,927 INFO L85 PathProgramCache]: Analyzing trace with hash -94425734, now seen corresponding path program 2 times [2022-11-19 08:04:37,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:37,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030442228] [2022-11-19 08:04:37,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:37,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:37,939 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:04:37,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1796719900] [2022-11-19 08:04:37,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:04:37,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:37,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:37,948 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:37,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 08:04:38,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:04:38,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:04:38,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 46 conjunts are in the unsatisfiable core [2022-11-19 08:04:38,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:38,613 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 08:04:38,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:39,085 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:04:39,085 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:39,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030442228] [2022-11-19 08:04:39,086 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:04:39,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796719900] [2022-11-19 08:04:39,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796719900] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:39,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1374576513] [2022-11-19 08:04:39,088 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:04:39,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:39,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:39,089 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:39,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:45,469 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-19 08:04:45,535 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:04:45,549 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:50,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4824#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:04:50,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:50,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:04:50,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-19 08:04:50,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398227633] [2022-11-19 08:04:50,660 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:50,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 08:04:50,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:50,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 08:04:50,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1765, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:04:50,663 INFO L87 Difference]: Start difference. First operand 167 states and 229 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-19 08:05:10,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:10,201 INFO L93 Difference]: Finished difference Result 450 states and 637 transitions. [2022-11-19 08:05:10,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 08:05:10,202 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 59 [2022-11-19 08:05:10,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:10,205 INFO L225 Difference]: With dead ends: 450 [2022-11-19 08:05:10,205 INFO L226 Difference]: Without dead ends: 379 [2022-11-19 08:05:10,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 126 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2139 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=781, Invalid=5225, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 08:05:10,208 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 314 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1155 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 1501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 1155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:10,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 376 Invalid, 1501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 1155 Invalid, 0 Unknown, 0 Unchecked, 10.6s Time] [2022-11-19 08:05:10,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-11-19 08:05:10,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 248. [2022-11-19 08:05:10,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 156 states have (on average 1.2243589743589745) internal successors, (191), 157 states have internal predecessors, (191), 77 states have call successors, (77), 14 states have call predecessors, (77), 14 states have return successors, (76), 76 states have call predecessors, (76), 76 states have call successors, (76) [2022-11-19 08:05:10,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 344 transitions. [2022-11-19 08:05:10,389 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 344 transitions. Word has length 59 [2022-11-19 08:05:10,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:10,389 INFO L495 AbstractCegarLoop]: Abstraction has 248 states and 344 transitions. [2022-11-19 08:05:10,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (14), 3 states have call predecessors, (14), 2 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2022-11-19 08:05:10,389 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 344 transitions. [2022-11-19 08:05:10,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-19 08:05:10,391 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:10,391 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:10,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:10,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:05:10,595 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:10,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:10,596 INFO L85 PathProgramCache]: Analyzing trace with hash -1223812978, now seen corresponding path program 3 times [2022-11-19 08:05:10,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:10,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737335599] [2022-11-19 08:05:10,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:10,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:10,609 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:05:10,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1662511705] [2022-11-19 08:05:10,609 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:05:10,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:10,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:10,611 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:10,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 08:05:10,669 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:05:10,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:05:10,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-19 08:05:10,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:10,727 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:05:10,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:10,823 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:05:10,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:10,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737335599] [2022-11-19 08:05:10,824 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:05:10,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662511705] [2022-11-19 08:05:10,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662511705] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:10,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305105751] [2022-11-19 08:05:10,826 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:05:10,827 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:10,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:10,827 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:10,828 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:17,756 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-19 08:05:17,840 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:05:17,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:20,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6355#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:20,517 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:20,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:05:20,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-11-19 08:05:20,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503447267] [2022-11-19 08:05:20,518 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:20,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-19 08:05:20,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:20,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-19 08:05:20,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2022-11-19 08:05:20,520 INFO L87 Difference]: Start difference. First operand 248 states and 344 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-19 08:05:21,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:21,218 INFO L93 Difference]: Finished difference Result 357 states and 500 transitions. [2022-11-19 08:05:21,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 08:05:21,219 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 59 [2022-11-19 08:05:21,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:21,221 INFO L225 Difference]: With dead ends: 357 [2022-11-19 08:05:21,221 INFO L226 Difference]: Without dead ends: 259 [2022-11-19 08:05:21,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 642 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=244, Invalid=1562, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 08:05:21,223 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 83 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:21,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 196 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:05:21,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-19 08:05:21,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 229. [2022-11-19 08:05:21,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 141 states have (on average 1.1914893617021276) internal successors, (168), 142 states have internal predecessors, (168), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2022-11-19 08:05:21,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 313 transitions. [2022-11-19 08:05:21,376 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 313 transitions. Word has length 59 [2022-11-19 08:05:21,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:21,377 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 313 transitions. [2022-11-19 08:05:21,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2022-11-19 08:05:21,378 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 313 transitions. [2022-11-19 08:05:21,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-19 08:05:21,379 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:21,379 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:21,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:21,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-19 08:05:21,585 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:21,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:21,585 INFO L85 PathProgramCache]: Analyzing trace with hash 255729376, now seen corresponding path program 4 times [2022-11-19 08:05:21,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:21,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594485288] [2022-11-19 08:05:21,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:21,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:21,596 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:05:21,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1937171128] [2022-11-19 08:05:21,597 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:05:21,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:21,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:21,599 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:21,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 08:05:21,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:05:21,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 08:05:21,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:21,823 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2022-11-19 08:05:21,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:21,917 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-11-19 08:05:21,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:21,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594485288] [2022-11-19 08:05:21,917 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:05:21,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937171128] [2022-11-19 08:05:21,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937171128] provided 1 perfect and 1 imperfect interpolant sequences [2022-11-19 08:05:21,917 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:05:21,917 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2022-11-19 08:05:21,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880916784] [2022-11-19 08:05:21,918 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:05:21,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:05:21,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:21,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:05:21,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2022-11-19 08:05:21,919 INFO L87 Difference]: Start difference. First operand 229 states and 313 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-19 08:05:22,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:05:22,199 INFO L93 Difference]: Finished difference Result 261 states and 358 transitions. [2022-11-19 08:05:22,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:05:22,200 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 64 [2022-11-19 08:05:22,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:05:22,202 INFO L225 Difference]: With dead ends: 261 [2022-11-19 08:05:22,202 INFO L226 Difference]: Without dead ends: 259 [2022-11-19 08:05:22,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2022-11-19 08:05:22,203 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:05:22,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 105 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:05:22,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-19 08:05:22,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 255. [2022-11-19 08:05:22,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 153 states have (on average 1.196078431372549) internal successors, (183), 154 states have internal predecessors, (183), 85 states have call successors, (85), 16 states have call predecessors, (85), 16 states have return successors, (84), 84 states have call predecessors, (84), 84 states have call successors, (84) [2022-11-19 08:05:22,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 352 transitions. [2022-11-19 08:05:22,437 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 352 transitions. Word has length 64 [2022-11-19 08:05:22,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:05:22,438 INFO L495 AbstractCegarLoop]: Abstraction has 255 states and 352 transitions. [2022-11-19 08:05:22,438 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 4 states have internal predecessors, (23), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-19 08:05:22,438 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 352 transitions. [2022-11-19 08:05:22,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-19 08:05:22,440 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:05:22,440 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:05:22,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 08:05:22,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:22,646 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:05:22,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:05:22,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1508724982, now seen corresponding path program 5 times [2022-11-19 08:05:22,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:05:22,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938134603] [2022-11-19 08:05:22,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:05:22,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:05:22,657 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:05:22,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [236026032] [2022-11-19 08:05:22,658 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:05:22,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:05:22,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:05:22,659 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:05:22,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 08:05:22,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:05:22,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:05:22,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-19 08:05:22,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:05:23,555 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 13 proven. 22 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-19 08:05:23,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:05:24,992 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 14 proven. 18 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-11-19 08:05:24,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:05:24,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938134603] [2022-11-19 08:05:24,992 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:05:24,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236026032] [2022-11-19 08:05:24,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236026032] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:05:24,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [402743733] [2022-11-19 08:05:24,995 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:05:24,995 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:05:24,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:05:24,995 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:05:24,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:05:30,906 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-19 08:05:30,961 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:05:30,974 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:05:40,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8914#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:05:40,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:05:40,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:05:40,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2022-11-19 08:05:40,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815912714] [2022-11-19 08:05:40,778 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:05:40,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 08:05:40,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:05:40,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 08:05:40,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1768, Unknown=0, NotChecked=0, Total=1980 [2022-11-19 08:05:40,780 INFO L87 Difference]: Start difference. First operand 255 states and 352 transitions. Second operand has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-19 08:06:06,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:06:06,150 INFO L93 Difference]: Finished difference Result 395 states and 560 transitions. [2022-11-19 08:06:06,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 08:06:06,151 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 64 [2022-11-19 08:06:06,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:06:06,154 INFO L225 Difference]: With dead ends: 395 [2022-11-19 08:06:06,154 INFO L226 Difference]: Without dead ends: 393 [2022-11-19 08:06:06,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 140 SyntacticMatches, 7 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1783 ImplicationChecksByTransitivity, 23.6s TimeCoverageRelationStatistics Valid=654, Invalid=4316, Unknown=0, NotChecked=0, Total=4970 [2022-11-19 08:06:06,157 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 310 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 390 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 1491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 390 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:06:06,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 369 Invalid, 1491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [390 Valid, 1101 Invalid, 0 Unknown, 0 Unchecked, 12.5s Time] [2022-11-19 08:06:06,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-19 08:06:06,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 342. [2022-11-19 08:06:06,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 202 states have (on average 1.2128712871287128) internal successors, (245), 203 states have internal predecessors, (245), 121 states have call successors, (121), 18 states have call predecessors, (121), 18 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2022-11-19 08:06:06,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 486 transitions. [2022-11-19 08:06:06,470 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 486 transitions. Word has length 64 [2022-11-19 08:06:06,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:06:06,471 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 486 transitions. [2022-11-19 08:06:06,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.16) internal successors, (54), 23 states have internal predecessors, (54), 5 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2022-11-19 08:06:06,472 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 486 transitions. [2022-11-19 08:06:06,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-19 08:06:06,473 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:06:06,473 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:06:06,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 08:06:06,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 08:06:06,683 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:06:06,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:06:06,683 INFO L85 PathProgramCache]: Analyzing trace with hash 1897496259, now seen corresponding path program 1 times [2022-11-19 08:06:06,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:06:06,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010387909] [2022-11-19 08:06:06,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:06,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:06:06,711 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:06:06,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1193691054] [2022-11-19 08:06:06,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:06:06,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:06:06,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:06:06,742 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:06:06,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 08:06:06,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:06:06,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-19 08:06:06,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:06:08,037 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-19 08:06:08,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:06:11,130 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 08:06:11,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:06:11,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010387909] [2022-11-19 08:06:11,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:06:11,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193691054] [2022-11-19 08:06:11,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193691054] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:06:11,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271666558] [2022-11-19 08:06:11,133 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-19 08:06:11,133 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:06:11,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:06:11,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:06:11,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:06:17,823 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:06:17,830 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:06:17,843 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:06:31,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10640#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:06:31,174 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:06:31,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:06:31,175 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 29 [2022-11-19 08:06:31,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525257886] [2022-11-19 08:06:31,175 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:06:31,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-19 08:06:31,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:06:31,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-19 08:06:31,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=1857, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 08:06:31,177 INFO L87 Difference]: Start difference. First operand 342 states and 486 transitions. Second operand has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-19 08:07:33,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:33,239 INFO L93 Difference]: Finished difference Result 489 states and 696 transitions. [2022-11-19 08:07:33,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-11-19 08:07:33,240 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) Word has length 78 [2022-11-19 08:07:33,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:33,243 INFO L225 Difference]: With dead ends: 489 [2022-11-19 08:07:33,243 INFO L226 Difference]: Without dead ends: 485 [2022-11-19 08:07:33,245 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 170 SyntacticMatches, 18 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4414 ImplicationChecksByTransitivity, 61.5s TimeCoverageRelationStatistics Valid=1517, Invalid=10255, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 08:07:33,245 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 319 mSDsluCounter, 532 mSDsCounter, 0 mSdLazyCounter, 2187 mSolverCounterSat, 595 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 623 SdHoareTripleChecker+Invalid, 2782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 595 IncrementalHoareTripleChecker+Valid, 2187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:33,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 623 Invalid, 2782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [595 Valid, 2187 Invalid, 0 Unknown, 0 Unchecked, 15.9s Time] [2022-11-19 08:07:33,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-19 08:07:33,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 441. [2022-11-19 08:07:33,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 253 states have (on average 1.225296442687747) internal successors, (310), 254 states have internal predecessors, (310), 165 states have call successors, (165), 22 states have call predecessors, (165), 22 states have return successors, (164), 164 states have call predecessors, (164), 164 states have call successors, (164) [2022-11-19 08:07:33,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 639 transitions. [2022-11-19 08:07:33,690 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 639 transitions. Word has length 78 [2022-11-19 08:07:33,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:33,690 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 639 transitions. [2022-11-19 08:07:33,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.0) internal successors, (52), 26 states have internal predecessors, (52), 8 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 6 states have call predecessors, (22), 6 states have call successors, (22) [2022-11-19 08:07:33,691 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 639 transitions. [2022-11-19 08:07:33,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:07:33,692 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:33,692 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:33,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 08:07:33,893 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-19 08:07:33,893 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:33,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:33,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1729932497, now seen corresponding path program 1 times [2022-11-19 08:07:33,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:33,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196511507] [2022-11-19 08:07:33,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:33,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:33,906 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:33,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [295064356] [2022-11-19 08:07:33,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:33,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:33,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:33,908 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:33,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 08:07:33,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:33,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-19 08:07:33,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:34,243 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2022-11-19 08:07:34,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:34,962 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2022-11-19 08:07:34,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:34,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196511507] [2022-11-19 08:07:34,963 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:34,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295064356] [2022-11-19 08:07:34,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295064356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:34,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [525771525] [2022-11-19 08:07:34,965 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-19 08:07:34,965 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:34,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:34,966 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:34,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:37,780 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 32 for LOIs [2022-11-19 08:07:37,833 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:07:37,846 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:07:41,075 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12759#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:07:41,075 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:07:41,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:07:41,075 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2022-11-19 08:07:41,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815907724] [2022-11-19 08:07:41,076 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:07:41,076 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 08:07:41,076 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:07:41,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 08:07:41,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1233, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:07:41,078 INFO L87 Difference]: Start difference. First operand 441 states and 639 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-19 08:07:44,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:07:44,646 INFO L93 Difference]: Finished difference Result 1009 states and 1593 transitions. [2022-11-19 08:07:44,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 08:07:44,646 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 81 [2022-11-19 08:07:44,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:07:44,652 INFO L225 Difference]: With dead ends: 1009 [2022-11-19 08:07:44,653 INFO L226 Difference]: Without dead ends: 1007 [2022-11-19 08:07:44,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 195 SyntacticMatches, 11 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=480, Invalid=2942, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 08:07:44,655 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 164 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:07:44,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 449 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 691 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 08:07:44,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1007 states. [2022-11-19 08:07:45,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1007 to 929. [2022-11-19 08:07:45,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 447 states have (on average 1.3221476510067114) internal successors, (591), 448 states have internal predecessors, (591), 457 states have call successors, (457), 24 states have call predecessors, (457), 24 states have return successors, (456), 456 states have call predecessors, (456), 456 states have call successors, (456) [2022-11-19 08:07:45,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1504 transitions. [2022-11-19 08:07:45,954 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1504 transitions. Word has length 81 [2022-11-19 08:07:45,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:07:45,955 INFO L495 AbstractCegarLoop]: Abstraction has 929 states and 1504 transitions. [2022-11-19 08:07:45,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 17 states have internal predecessors, (37), 8 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2022-11-19 08:07:45,956 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1504 transitions. [2022-11-19 08:07:45,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:07:45,957 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:07:45,957 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:07:45,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-19 08:07:46,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 08:07:46,163 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:07:46,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:07:46,164 INFO L85 PathProgramCache]: Analyzing trace with hash 144664241, now seen corresponding path program 1 times [2022-11-19 08:07:46,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:07:46,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596403086] [2022-11-19 08:07:46,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:46,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:07:46,175 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:07:46,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [686060895] [2022-11-19 08:07:46,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:07:46,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:07:46,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:07:46,177 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:07:46,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 08:07:46,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:07:46,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-19 08:07:46,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:07:47,032 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2022-11-19 08:07:47,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:07:48,230 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-11-19 08:07:48,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:07:48,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596403086] [2022-11-19 08:07:48,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:07:48,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686060895] [2022-11-19 08:07:48,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686060895] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:07:48,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715088910] [2022-11-19 08:07:48,233 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:07:48,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:07:48,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:07:48,234 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:07:48,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:07:54,701 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-19 08:07:54,752 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:07:54,766 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:08:04,150 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16563#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2022-11-19 08:08:04,150 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:08:04,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:08:04,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2022-11-19 08:08:04,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342092155] [2022-11-19 08:08:04,151 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:08:04,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-19 08:08:04,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:08:04,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-19 08:08:04,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1250, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 08:08:04,152 INFO L87 Difference]: Start difference. First operand 929 states and 1504 transitions. Second operand has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-19 08:08:53,253 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:09:04,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:09:04,341 INFO L93 Difference]: Finished difference Result 1307 states and 2105 transitions. [2022-11-19 08:09:04,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-19 08:09:04,342 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 81 [2022-11-19 08:09:04,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:09:04,350 INFO L225 Difference]: With dead ends: 1307 [2022-11-19 08:09:04,351 INFO L226 Difference]: Without dead ends: 1305 [2022-11-19 08:09:04,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 187 SyntacticMatches, 18 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2368 ImplicationChecksByTransitivity, 47.3s TimeCoverageRelationStatistics Valid=887, Invalid=5114, Unknown=5, NotChecked=0, Total=6006 [2022-11-19 08:09:04,354 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 227 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 1282 mSolverCounterSat, 440 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 1723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 440 IncrementalHoareTripleChecker+Valid, 1282 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:09:04,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [227 Valid, 407 Invalid, 1723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [440 Valid, 1282 Invalid, 1 Unknown, 0 Unchecked, 20.8s Time] [2022-11-19 08:09:04,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1305 states. [2022-11-19 08:09:06,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1305 to 1166. [2022-11-19 08:09:06,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1166 states, 563 states have (on average 1.325044404973357) internal successors, (746), 564 states have internal predecessors, (746), 573 states have call successors, (573), 29 states have call predecessors, (573), 29 states have return successors, (572), 572 states have call predecessors, (572), 572 states have call successors, (572) [2022-11-19 08:09:06,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1166 states to 1166 states and 1891 transitions. [2022-11-19 08:09:06,427 INFO L78 Accepts]: Start accepts. Automaton has 1166 states and 1891 transitions. Word has length 81 [2022-11-19 08:09:06,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:09:06,427 INFO L495 AbstractCegarLoop]: Abstraction has 1166 states and 1891 transitions. [2022-11-19 08:09:06,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 19 states have internal predecessors, (48), 8 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2022-11-19 08:09:06,428 INFO L276 IsEmpty]: Start isEmpty. Operand 1166 states and 1891 transitions. [2022-11-19 08:09:06,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-11-19 08:09:06,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:09:06,430 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:09:06,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 08:09:06,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 08:09:06,637 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:09:06,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:09:06,637 INFO L85 PathProgramCache]: Analyzing trace with hash 646028470, now seen corresponding path program 6 times [2022-11-19 08:09:06,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:09:06,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654904753] [2022-11-19 08:09:06,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:09:06,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:09:06,646 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:09:06,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1993831405] [2022-11-19 08:09:06,647 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:09:06,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:09:06,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:09:06,649 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:09:06,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 08:09:06,712 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:09:06,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:09:06,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-19 08:09:06,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:09:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 34 proven. 44 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2022-11-19 08:09:10,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:09:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2022-11-19 08:09:11,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:09:11,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654904753] [2022-11-19 08:09:11,503 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:09:11,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993831405] [2022-11-19 08:09:11,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993831405] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:09:11,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [134362076] [2022-11-19 08:09:11,505 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:09:11,505 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:09:11,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:09:11,506 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:09:11,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:09:16,830 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2022-11-19 08:09:16,881 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:09:16,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:09:22,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21358#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:09:22,996 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:09:22,996 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:09:22,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 8] total 24 [2022-11-19 08:09:22,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470447461] [2022-11-19 08:09:22,996 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:09:22,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-19 08:09:22,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:09:22,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-19 08:09:22,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1624, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 08:09:22,999 INFO L87 Difference]: Start difference. First operand 1166 states and 1891 transitions. Second operand has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-19 08:09:54,493 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:09:56,751 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:10:01,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:10:01,421 INFO L93 Difference]: Finished difference Result 1313 states and 2105 transitions. [2022-11-19 08:10:01,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-19 08:10:01,422 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) Word has length 84 [2022-11-19 08:10:01,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:10:01,429 INFO L225 Difference]: With dead ends: 1313 [2022-11-19 08:10:01,429 INFO L226 Difference]: Without dead ends: 1311 [2022-11-19 08:10:01,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1542 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=378, Invalid=3282, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 08:10:01,432 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 116 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 1175 mSolverCounterSat, 146 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 1323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 1175 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:10:01,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 327 Invalid, 1323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 1175 Invalid, 2 Unknown, 0 Unchecked, 15.7s Time] [2022-11-19 08:10:01,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1311 states. [2022-11-19 08:10:03,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1311 to 1190. [2022-11-19 08:10:03,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1190 states, 581 states have (on average 1.314974182444062) internal successors, (764), 582 states have internal predecessors, (764), 573 states have call successors, (573), 35 states have call predecessors, (573), 35 states have return successors, (572), 572 states have call predecessors, (572), 572 states have call successors, (572) [2022-11-19 08:10:03,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1190 states to 1190 states and 1909 transitions. [2022-11-19 08:10:03,693 INFO L78 Accepts]: Start accepts. Automaton has 1190 states and 1909 transitions. Word has length 84 [2022-11-19 08:10:03,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:10:03,694 INFO L495 AbstractCegarLoop]: Abstraction has 1190 states and 1909 transitions. [2022-11-19 08:10:03,694 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.739130434782609) internal successors, (63), 20 states have internal predecessors, (63), 8 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (21), 6 states have call predecessors, (21), 6 states have call successors, (21) [2022-11-19 08:10:03,694 INFO L276 IsEmpty]: Start isEmpty. Operand 1190 states and 1909 transitions. [2022-11-19 08:10:03,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-19 08:10:03,697 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:10:03,698 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:10:03,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 08:10:03,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 08:10:03,904 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:10:03,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:10:03,904 INFO L85 PathProgramCache]: Analyzing trace with hash 355863159, now seen corresponding path program 2 times [2022-11-19 08:10:03,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:10:03,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89496188] [2022-11-19 08:10:03,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:10:03,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:10:03,929 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:10:03,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007393197] [2022-11-19 08:10:03,929 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:10:03,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:10:03,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:10:03,931 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:10:03,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 08:10:04,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-19 08:10:04,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:10:04,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-19 08:10:04,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:10:05,257 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2022-11-19 08:10:05,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:10:07,596 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 24 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-11-19 08:10:07,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:10:07,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89496188] [2022-11-19 08:10:07,596 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:10:07,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007393197] [2022-11-19 08:10:07,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007393197] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:10:07,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942804799] [2022-11-19 08:10:07,602 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-19 08:10:07,603 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:10:07,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:10:07,603 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:10:07,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:10:13,672 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-19 08:10:13,717 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:10:13,730 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:10:30,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26249#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:10:30,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:10:30,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:10:30,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2022-11-19 08:10:30,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519931978] [2022-11-19 08:10:30,430 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:10:30,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-19 08:10:30,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:10:30,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-19 08:10:30,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1929, Unknown=0, NotChecked=0, Total=2162 [2022-11-19 08:10:30,432 INFO L87 Difference]: Start difference. First operand 1190 states and 1909 transitions. Second operand has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-19 08:10:40,318 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:10:50,417 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:11:17,505 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:11:30,932 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.02s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:12:12,757 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:12:14,762 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:12:28,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:12:28,725 INFO L93 Difference]: Finished difference Result 1988 states and 3188 transitions. [2022-11-19 08:12:28,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-11-19 08:12:28,726 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) Word has length 98 [2022-11-19 08:12:28,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:12:28,733 INFO L225 Difference]: With dead ends: 1988 [2022-11-19 08:12:28,733 INFO L226 Difference]: Without dead ends: 1470 [2022-11-19 08:12:28,738 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 228 SyntacticMatches, 19 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6200 ImplicationChecksByTransitivity, 98.1s TimeCoverageRelationStatistics Valid=2418, Invalid=13584, Unknown=0, NotChecked=0, Total=16002 [2022-11-19 08:12:28,739 INFO L413 NwaCegarLoop]: 99 mSDtfsCounter, 368 mSDsluCounter, 535 mSDsCounter, 0 mSdLazyCounter, 2086 mSolverCounterSat, 644 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 634 SdHoareTripleChecker+Invalid, 2732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 644 IncrementalHoareTripleChecker+Valid, 2086 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 35.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:12:28,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 634 Invalid, 2732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [644 Valid, 2086 Invalid, 2 Unknown, 0 Unchecked, 35.8s Time] [2022-11-19 08:12:28,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1470 states. [2022-11-19 08:12:30,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1470 to 1318. [2022-11-19 08:12:30,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1318 states, 641 states have (on average 1.31201248049922) internal successors, (841), 642 states have internal predecessors, (841), 637 states have call successors, (637), 39 states have call predecessors, (637), 39 states have return successors, (636), 636 states have call predecessors, (636), 636 states have call successors, (636) [2022-11-19 08:12:30,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1318 states to 1318 states and 2114 transitions. [2022-11-19 08:12:30,907 INFO L78 Accepts]: Start accepts. Automaton has 1318 states and 2114 transitions. Word has length 98 [2022-11-19 08:12:30,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:12:30,908 INFO L495 AbstractCegarLoop]: Abstraction has 1318 states and 2114 transitions. [2022-11-19 08:12:30,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (29), 8 states have call predecessors, (29), 7 states have call successors, (29) [2022-11-19 08:12:30,909 INFO L276 IsEmpty]: Start isEmpty. Operand 1318 states and 2114 transitions. [2022-11-19 08:12:30,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-19 08:12:30,911 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:12:30,912 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:12:30,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 08:12:31,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 08:12:31,119 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:12:31,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:12:31,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1281823225, now seen corresponding path program 3 times [2022-11-19 08:12:31,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:12:31,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705420133] [2022-11-19 08:12:31,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:12:31,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:12:31,130 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:12:31,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [969454552] [2022-11-19 08:12:31,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:12:31,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:12:31,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:12:31,132 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:12:31,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 08:12:31,229 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:12:31,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:12:31,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-19 08:12:31,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:12:32,795 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 52 proven. 46 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2022-11-19 08:12:32,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:12:41,183 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 50 proven. 45 refuted. 0 times theorem prover too weak. 243 trivial. 0 not checked. [2022-11-19 08:12:41,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:12:41,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705420133] [2022-11-19 08:12:41,184 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:12:41,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969454552] [2022-11-19 08:12:41,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969454552] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:12:41,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [703764137] [2022-11-19 08:12:41,186 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2022-11-19 08:12:41,187 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:12:41,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:12:41,187 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:12:41,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:12:47,465 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 8 for LOIs [2022-11-19 08:12:47,470 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:12:47,490 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:13:09,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32644#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:13:09,614 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:13:09,614 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 08:13:09,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 37 [2022-11-19 08:13:09,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057810547] [2022-11-19 08:13:09,615 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 08:13:09,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-19 08:13:09,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:13:09,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-19 08:13:09,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=2539, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 08:13:09,617 INFO L87 Difference]: Start difference. First operand 1318 states and 2114 transitions. Second operand has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-19 08:13:33,983 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.48s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:13:35,985 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:13:38,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:13:49,859 WARN L233 SmtUtils]: Spent 7.26s on a formula simplification that was a NOOP. DAG size: 103 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:14:03,953 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:21,246 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:24,867 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:26,869 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:28,164 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:30,172 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:32,273 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:34,280 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:14:58,552 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:00,555 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:04,092 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:07,320 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:29,944 WARN L233 SmtUtils]: Spent 5.55s on a formula simplification that was a NOOP. DAG size: 106 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:15:36,165 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:42,121 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:46,991 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:15:55,404 WARN L233 SmtUtils]: Spent 8.21s on a formula simplification that was a NOOP. DAG size: 113 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:16:00,801 WARN L233 SmtUtils]: Spent 5.15s on a formula simplification. DAG size of input: 106 DAG size of output: 104 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 08:16:09,826 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-11-19 08:16:15,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:15,818 INFO L93 Difference]: Finished difference Result 1547 states and 2425 transitions. [2022-11-19 08:16:15,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-19 08:16:15,819 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) Word has length 103 [2022-11-19 08:16:15,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:15,825 INFO L225 Difference]: With dead ends: 1547 [2022-11-19 08:16:15,826 INFO L226 Difference]: Without dead ends: 1539 [2022-11-19 08:16:15,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 243 SyntacticMatches, 12 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5111 ImplicationChecksByTransitivity, 140.7s TimeCoverageRelationStatistics Valid=2152, Invalid=12122, Unknown=6, NotChecked=0, Total=14280 [2022-11-19 08:16:15,829 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 441 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 2516 mSolverCounterSat, 860 mSolverCounterUnsat, 17 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 67.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 3393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 860 IncrementalHoareTripleChecker+Valid, 2516 IncrementalHoareTripleChecker+Invalid, 17 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 67.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:15,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 386 Invalid, 3393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [860 Valid, 2516 Invalid, 17 Unknown, 0 Unchecked, 67.7s Time] [2022-11-19 08:16:15,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1539 states. [2022-11-19 08:16:19,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1539 to 1443. [2022-11-19 08:16:19,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1443 states, 704 states have (on average 1.3096590909090908) internal successors, (922), 705 states have internal predecessors, (922), 693 states have call successors, (693), 45 states have call predecessors, (693), 45 states have return successors, (692), 692 states have call predecessors, (692), 692 states have call successors, (692) [2022-11-19 08:16:19,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1443 states to 1443 states and 2307 transitions. [2022-11-19 08:16:19,098 INFO L78 Accepts]: Start accepts. Automaton has 1443 states and 2307 transitions. Word has length 103 [2022-11-19 08:16:19,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:19,098 INFO L495 AbstractCegarLoop]: Abstraction has 1443 states and 2307 transitions. [2022-11-19 08:16:19,099 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 35 states have internal predecessors, (67), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 9 states have call predecessors, (30), 9 states have call successors, (30) [2022-11-19 08:16:19,099 INFO L276 IsEmpty]: Start isEmpty. Operand 1443 states and 2307 transitions. [2022-11-19 08:16:19,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-11-19 08:16:19,101 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:19,102 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:19,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:19,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:19,308 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:19,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:19,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1547138168, now seen corresponding path program 2 times [2022-11-19 08:16:19,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:19,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256985062] [2022-11-19 08:16:19,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:19,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:19,317 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:16:19,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1585567967] [2022-11-19 08:16:19,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:16:19,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:19,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:19,319 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:19,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 08:16:19,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 08:16:19,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:19,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-19 08:16:19,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:20,939 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 70 proven. 35 refuted. 0 times theorem prover too weak. 291 trivial. 0 not checked. [2022-11-19 08:16:20,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:22,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:22,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256985062] [2022-11-19 08:16:22,185 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:16:22,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585567967] [2022-11-19 08:16:22,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585567967] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:22,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046319551] [2022-11-19 08:16:22,187 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:16:22,187 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:22,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:22,187 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:22,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:28,008 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-19 08:16:28,054 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:16:28,065 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:16:37,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38203#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:16:37,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:16:37,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:16:37,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2022-11-19 08:16:37,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251424840] [2022-11-19 08:16:37,072 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 08:16:37,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-19 08:16:37,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:16:37,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-19 08:16:37,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1388, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 08:16:37,074 INFO L87 Difference]: Start difference. First operand 1443 states and 2307 transitions. Second operand has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-19 08:16:42,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:16:42,474 INFO L93 Difference]: Finished difference Result 1632 states and 2599 transitions. [2022-11-19 08:16:42,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-19 08:16:42,474 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 108 [2022-11-19 08:16:42,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:16:42,481 INFO L225 Difference]: With dead ends: 1632 [2022-11-19 08:16:42,481 INFO L226 Difference]: Without dead ends: 1630 [2022-11-19 08:16:42,483 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 172 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=250, Invalid=2006, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 08:16:42,483 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 107 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 1030 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:16:42,484 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 217 Invalid, 1030 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 937 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-19 08:16:42,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1630 states. [2022-11-19 08:16:46,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1630 to 1605. [2022-11-19 08:16:46,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1605 states, 782 states have (on average 1.313299232736573) internal successors, (1027), 783 states have internal predecessors, (1027), 773 states have call successors, (773), 49 states have call predecessors, (773), 49 states have return successors, (772), 772 states have call predecessors, (772), 772 states have call successors, (772) [2022-11-19 08:16:46,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1605 states to 1605 states and 2572 transitions. [2022-11-19 08:16:46,078 INFO L78 Accepts]: Start accepts. Automaton has 1605 states and 2572 transitions. Word has length 108 [2022-11-19 08:16:46,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:16:46,078 INFO L495 AbstractCegarLoop]: Abstraction has 1605 states and 2572 transitions. [2022-11-19 08:16:46,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-19 08:16:46,079 INFO L276 IsEmpty]: Start isEmpty. Operand 1605 states and 2572 transitions. [2022-11-19 08:16:46,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-19 08:16:46,081 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:16:46,082 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:16:46,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 08:16:46,287 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:46,288 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:16:46,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:16:46,288 INFO L85 PathProgramCache]: Analyzing trace with hash -1168736987, now seen corresponding path program 3 times [2022-11-19 08:16:46,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:16:46,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046621921] [2022-11-19 08:16:46,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:16:46,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:16:46,305 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:16:46,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1159353171] [2022-11-19 08:16:46,308 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:16:46,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:16:46,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:16:46,309 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:16:46,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 08:16:46,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:16:46,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:16:46,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 82 conjunts are in the unsatisfiable core [2022-11-19 08:16:46,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:16:47,683 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 63 proven. 57 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2022-11-19 08:16:47,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:16:50,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:16:50,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046621921] [2022-11-19 08:16:50,459 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:16:50,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159353171] [2022-11-19 08:16:50,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159353171] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:16:50,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069816578] [2022-11-19 08:16:50,461 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:16:50,462 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:16:50,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:16:50,462 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:16:50,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:16:56,110 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-19 08:16:56,149 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:16:56,161 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:17:02,645 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44098#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-19 08:17:02,645 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:17:02,645 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:17:02,645 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2022-11-19 08:17:02,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713046533] [2022-11-19 08:17:02,645 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2022-11-19 08:17:02,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 08:17:02,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:17:02,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 08:17:02,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1551, Unknown=0, NotChecked=0, Total=1722 [2022-11-19 08:17:02,647 INFO L87 Difference]: Start difference. First operand 1605 states and 2572 transitions. Second operand has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-11-19 08:17:08,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:17:08,462 INFO L93 Difference]: Finished difference Result 2030 states and 3237 transitions. [2022-11-19 08:17:08,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 08:17:08,462 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 111 [2022-11-19 08:17:08,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:17:08,469 INFO L225 Difference]: With dead ends: 2030 [2022-11-19 08:17:08,469 INFO L226 Difference]: Without dead ends: 1719 [2022-11-19 08:17:08,471 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 177 SyntacticMatches, 24 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1694 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=257, Invalid=2499, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 08:17:08,472 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 98 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 1498 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 1563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:17:08,472 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 351 Invalid, 1563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1498 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-19 08:17:08,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2022-11-19 08:17:12,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1707. [2022-11-19 08:17:12,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1707 states, 832 states have (on average 1.3100961538461537) internal successors, (1090), 833 states have internal predecessors, (1090), 821 states have call successors, (821), 53 states have call predecessors, (821), 53 states have return successors, (820), 820 states have call predecessors, (820), 820 states have call successors, (820) [2022-11-19 08:17:12,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1707 states to 1707 states and 2731 transitions. [2022-11-19 08:17:12,259 INFO L78 Accepts]: Start accepts. Automaton has 1707 states and 2731 transitions. Word has length 111 [2022-11-19 08:17:12,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:17:12,259 INFO L495 AbstractCegarLoop]: Abstraction has 1707 states and 2731 transitions. [2022-11-19 08:17:12,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2022-11-19 08:17:12,260 INFO L276 IsEmpty]: Start isEmpty. Operand 1707 states and 2731 transitions. [2022-11-19 08:17:12,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-11-19 08:17:12,262 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:17:12,262 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:17:12,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 08:17:12,467 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:12,468 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:17:12,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:17:12,468 INFO L85 PathProgramCache]: Analyzing trace with hash -347612901, now seen corresponding path program 4 times [2022-11-19 08:17:12,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:17:12,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206056489] [2022-11-19 08:17:12,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:17:12,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:17:12,477 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-11-19 08:17:12,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1550287766] [2022-11-19 08:17:12,478 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:17:12,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:17:12,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:17:12,479 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:17:12,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e829c458-b393-4d6a-8a52-618d519ed6a3/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 08:17:12,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:17:12,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 08:17:12,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:17:16,109 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 54 proven. 66 refuted. 0 times theorem prover too weak. 285 trivial. 0 not checked. [2022-11-19 08:17:16,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:17:36,397 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 68 proven. 49 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-11-19 08:17:36,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:17:36,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206056489] [2022-11-19 08:17:36,397 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-11-19 08:17:36,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550287766] [2022-11-19 08:17:36,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550287766] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:17:36,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2026010456] [2022-11-19 08:17:36,399 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-19 08:17:36,399 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:17:36,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:17:36,400 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:17:36,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:17:42,039 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 39 for LOIs [2022-11-19 08:17:42,086 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 59 for LOIs [2022-11-19 08:17:42,099 INFO L180 IcfgInterpreter]: Interpretation finished